The Amazon Echo, a voice-driven computer that sits on a table top and answers to the name Alexa, can call up music tracks and radio stations, tell jokes, answer simple questions and control smart appliances. Even before Christmas it was already resident in about 4% of American households. Voice assistants are being widely used in smart phones, too: Apple’s Siri handles over 2 billion commands a week, and 20% of Google searches on Android-powered handsets in America are input by voice. Dictating e-mails and text messages now works reliably enough to be useful. Why type when you can talk?
Simple though it may seem, voice has the power to transform computing, by providing a natural means of interaction. Windows, icons and menus, and then touch screens, were welcomed as much easier ways to deal with computers than entering complex keyboard commands. But being able to talk to computers abolishes the need for a “user interface(界面)” at all. Just as mobile phones were more than existing phones without wires, and cars were more than carriages without horses, so computers without screens and keyboards have the potential to be more useful, more powerful than people can imagine today.
Voice will not wholly replace other forms of input and output. Sometimes it will remain more convenient to converse with a machine by typing rather than talking (Amazon is said to be working on an Echo device with a built-in screen). But voice is sure to account for a growing share of people’s interactions with the technology around them, from washing machines that tell you how much of the cycle they have left to virtual assistants in corporate call centres. However, to reach its full potential, the technology requires further breakthroughs and a resolution of the tricky questions it raises around the trade-off between convenience and privacy.
Computer-dictation systems have been around for years. But they were unreliable and required lengthy training to learn a specific user’s voice. Computer’s new ability to recognise almost anyone’s speech dependably without training is the latest manifestation (证明) of the power of “deep learning”, an artificial intelligence technique in which a software system is trained to use millions of examples, usually selected from the Internet. Thanks to deep learning, machines now nearly equal humans in transcription accuracy, computerized translation systems are improving rapidly and text-to-speech systems are becoming less robotic and more natural-sounding. Computers are, in short, getting much better at handling natural language in all its forms.
Although deep learning means that machines can recognize speech more reliably and talk in a more natural manner, they still don’t understand the meaning of language. That is the most difficult aspect of the problem and, if voice-driven computing is truly to flourish, one that must be overcome. Computers must be able to understand context in order to maintain a coherent conversation about something, rather than just responding to simple, one-off (一次性的) voice commands, as they mostly do today (“Hey, Siri, set a timer for ten minutes”). Researchers in universities and at companies are working on this problem, building “bots” that can hold more detailed conversations about more complex tasks, from searching information to making travel arrangements.
Many voice-driven devices are always listening, waiting to be activated(激活). Some people are already concerned about the implications of internet-connected microphones listening in every room and from every smart phone. Not all audio is sent to the cloud - devices wait for a trigger phrase (“Alexa”, “OK, Google”, “Hey, Cortana”, or “Hey, Siri”) before they start passing the user’s voice to the servers that actually handle the requests - but when it comes to storing audio, it is unclear who keeps what and when.
1. According to Paragraph l, the Amazon Echo ________.| A．has been sold out before Christmas |
| B．has been used by most American families |
| C．came on the market later than Apple’s Siri |
| D．is more useful than smart phones in dictating e-mails |
| A．It is vital to accurate identification of human voices. |
| B．It is almost the same as the computer-dictation system. |
| C．It has helped machines understand the meaning of language. |
| D．It has helped machines beat humans in accuracy and reliability. |
| A．The devices will be in charge of their life. |
| B．The devices need to be activated before working. |
| C．They are in the dark about their data’s ownership. |
| D．Their voices can be recognized by every smart phone. |
| A．Worried. | B．Doubtful. |
| C．Supportive. | D．Objective. |
相似题推荐
【推荐1】When Steve Jobs took to the stage in 2008 to announce the second iPhone and, just as importantly, the then-brand new App Store, he was selling consumers one simple thing: choice. Whether you wanted to play games , read the news , watch videos, or do a thousand other things, there was something for whatever your heart desired.
Then a funny thing happened. Logging into the App Store today is a bit like going Into a shopping mall armed only with a coupon (优惠券) for one thing: There's so much choice; it might just be easier to give up than choose.
It isn't just consumers who are burdened, though. Too much content of all kinds is also starting to have economic effects. When there are millions of apps available, It becomes more and more difficult to charge $ 5 or $10, so over time, a dollar or two has become the norm. A large amount of choice causes pressure, pushing prices down and driving us all a bit crazy in the process.
So what is the way forward? It may well be to turn less choice itself into the marketing strategy. There are already signs this is happening. Firstly, content companies are looking to prevent their offerings from getting lost in the tons of stuff. Most obvious is Disney , which is slowly pulling its films and shows off YouTube to open its own streaming service next year. The point is to narrow the focus so that those seeking Disney cartoons will have one place to go, rather than being around various services.
Yet if that represents a careful first step, there are more extreme options, too. Consider the idea of a wine club; From the tens of thousands of bottles each year, subscribers pay someone to select the most interesting or rare offerings. Perhaps what comes next for digital content is something similar—carefully selected offerings from trusted sources that end up putting choice in the hands of someone else in order to get rid of the anxiety of choosing.
Up until this point, too much choice in digital media has had only one solution: the algorithm (运算法则). But we've seen the trouble with algorithms like those on YouTube. They feed you only what you've already said you like, not things you may not yet know you're into. Worse, they have a tendency to serve up disturbing content. The way forward can't simply be more or better algorithms.
Instead , it's time for digital companies to start thinking about how to put limits on things: on how much we can use a device, or what we have available to choose from.
To be sure, it's the opposite of free market, which is supposed to work on offering more choice. But perhaps it isn't such an unusual reaction. Alter all, free markets are supposed to respond to consumer demand.
And as we move further into the digital revolution, what people are asking for is clear: Less.
1. Too much choice of content on the market results in_______.| A．the shutdown of companies |
| B．the anxiety of consumers |
| C．the poor quality of products |
| D．the slowdown of economy |
| A．Why content companies open their own streaming services. |
| B．Whether content companies should cut their offerings. |
| C．Where content companies should post their offerings. |
| D．How content companies narrow the consumers' focus. |
| A．make a better choice for them. | B．help to remove disturbing content |
| C．fail to offer what they possibly like | D．change their interest in digital media |
| A．Approving. | B．Skeptical. |
| C．Opposing. | D．Neutral. |
【推荐2】There are lots of ways to educate yourself on the Internet. You can find photos, documents, and films on almost any topic you can imagine. And at www.ted.com, you can access lectures by artists, scholars, designers, technicians and others.
TED began in 1984 as a conference that brought together individuals from the fields of technology, entertainment and design. It was intended to be a one-time event focusing on technology and design. The event ended up losing money, and it was six years before the founders tried it again. This time it worked, and since 1990, the TED conference has been an annual event. There are now two held every year, with topics as diverse as music, medicine, and money. Other specialized spin-off conferences address narrower issues.
The TED website came from a desire to share the conferences with the world, to “offer free knowledge from the world’s most inspired thinkers,” as the website puts it. The current version of the site was launched in April 2007, and contains videos of talks given at the TED conferences around the world. The talks are transcribed into hundreds of languages.
The TED website is owned by the Sapling Foundation, a non profit devoted to fostering the spread of great ideas. The Sapling foundation acquired TED in 2001. Since then, it has been focusing on using TED to broadcast ideas that might change the world.
TED, of course, isn’t immune to criticism. It’s been called elitist(精英) for its high ticket prices (more than 6,000 dollars total). It’s been accused by a few people of censorship for not publishing their talks. One controversial speaker was upset about being criticized by the conference’s host afterward.
The complaints, however, seem to be relatively few for such a large, long-running organization. And accusations of elitism ring hollow when so much is given away for free on TED’s website. Whatever its failings, TED is a source of inspirational information for those who seek it out.
1. What is the main topic of the article?| A．The case against TED. | B．What’s on TED today. |
| C．Pros and cons of www.ted.com. | D．What is TED. |
| A．The TED conference came after the success of www.ted.com. |
| B．Two TED conferences are now held every year. |
| C．TED talks are available in many languages. |
| D．The Sapling Foundation owns www.ted.com. |
| A．it is accepted to all involved that some TED talks might not be published |
| B．the host of the conference is one who plays a supportive role to the speakers |
| C．TED is criticized for giving special treatment to the wealthy or powerful |
| D．the negative comments on TED greatly affects its reputation |
| A．TED is elitist | B．TED is beneficial |
| C．TED isn’t important | D．TED is the best website |
【推荐3】I may not be on Vine or whatever the kids are using these days, but I’m on Facebook, Twitter and Instagram. I love being able to stay in touch with people living on the other side of the planet, I like sharing pictures of my cat and I’m even one of those people who shares lots of food pictures. I enjoy seeing people “like” my posts and comments, and my Facebook app is the first thing I look at in the morning-sometimes even before my eyes are fully open.
That being said, I haven’t posted a pictures about being pregnant on Facebook or anywhere else. I actively keep an eye out for any of my friends referring to my pregnancy in posts and comments and don’t allow any of them on my timeline. My husband is also of the same mindset, so if we haven’t mentioned it to you, chances are you don’t know anything about my pregnancy.
This has been and will continue to be a very purposeful decision on both our parts. We simply don’t believe that, beyond perhaps a simple birth announcement (maybe even without a picture), our child’s life should end up on Facebook.
This generation of kids is the first one in human history to have their lives shared in a forum as public as the Internet without their permission. Parents all over the world put their kids’ pictures on Facebook. I get the reasoning: Everyone wants to share pictures of their kids with friends and family. More often than not, such photos capture sweet moments and I’m sure grandmas and grandpas the world over are glad to have such easy access to their grandsons and granddaughters. I also take more and more pictures of our kids. After all, they’re lovely, and who doesn’t have a cell phone camera handy at all times?
For my part, I just don’t want my kid on social media until she’s old enough to put herself on there. Family pictures might be one thing, but posting cutesy photos of a baby’s first bath is another. I don’t know where my kid’s pictures might end up some day-surely the last thing a parent could want is for a darling photo of their kid to show up somewhere totally wrong.
1. What’s the author’s attitude to social media?| A．She is fond of the idea | B．She seldom posts pictures. |
| C．She can’t live without them | D．She prefers Vine to Facebook |
| A．Her husband doesn’t allow her to do so. |
| B．She is going to give her friends a surprise. |
| C．She wants to keep her baby out of the public eye |
| D．Her husband doesn’t like posts without pictures |
| A．To share sweet moments | B．To bring the family closer |
| C．To show off before friends | D．To please the other generation |
| A．Family pictures may change social media |
| B．Kids may get angry about their parents’ posts |
| C．People may show no interest in kids’ pictures |
| D．Posting kids’ pictures may put them in danger. |
【推荐1】Today’s amazing newspaper headline!
First family of four to walk to the South Pole wearing Mickey Mouse ears and clown’s shoes.
No, not really. It isn’t true. I invented it. But I wouldn’t be surprised to see it one day soon. It seems that every week someone becomes ”the first” or “the youngest” or “the oldest” or even “the first married couple” to do something that doesn’t seem to be very useful to the rest of humanity.
This year I’ve seen headlines saying “The youngest person to sail the Atlantic alone”, “The youngest Briton to climb Mount Everest”, and “The first people to fly around the world in a hot air balloon”. Why do they do it? Don’t they have better things to do with their time and money? And why should I be interested anyway?
Human beings have already climbed the highest mountains, sailed across the oceans and flown around the world. People have already reached the most remote parts of our planet. Many of these things were done a long, long time ago. There just isn’t anything left to explore nowadays. I suppose there’s still a lot of the universe left, and the bottom of the oceans is still a bit of a mystery, but you need a lot of technology to explore areas like that. So, those people who feel the need for adventure can only do things that have been done before. So they have to try and do it in a new way, or be “the fastest” or “the youngest” or “the oldest” to do something that isn’t really new at all.
What is so great about climbing Mount Everest these days anyway? It’s become a popular tourist trip. People pay thousands of dollars to be taken up the mountain by the local Sherpas, who lead the way and carry the bags. At any one time there are about a thousand people either climbing up or on their way back down. As a result, Everest is covered with rubbish and the Sherpas have to make special trips up the mountain to pick it up. The climbers are often inexperienced and when they get into trouble other people have to risk their lives to bring them down to safety. Helicopter crews have been killed trying to reach people who were stuck on the mountain.
In January 2003 a helicopter carrying two British men crashed into the sea near Antarctica. I’m not quite sure what they were trying to be “the first” or “the youngest” to do. The Chilean navy picked them up after a nine-hour rescue mission that cost tens of thousands of pounds, all paid for by the Chilean and British taxpayers.
Talking of taxpayers, many Australians are getting a bit fed up with record breakers. A lot of people trying to break sailing or rowing records get into trouble in the seas around Australia, so the Australian navy has to send ships to save them. There have been a lot of difficult, time-consuming rescue missions in recent years costing the Australian government millions of dollars. I suppose we can’t just leave them to drown, but personally, I think we should give the bill to the people who are rescued. Perhaps they would think twice about doing it if they had to pay for expensive insurance premiums (保费). Then I wouldn’t have to read about them in the newspapers either.
1. The writer invents the newspaper headline in paragraphs 1 & 2 to ________.| A．persuade readers of a new trend | B．entertain readers with his humor |
| C．get readers interested in the topic | D．remind readers of an important event |
| A．Mount Everest is now covered with a lot of rubbish |
| B．climbing Mount Everest has already lost its true meaning |
| C．it’s impossible to climb up Mountain Everest without help |
| D．people without experience may get in trouble or even danger |
| A．They have to pay for the costs of rescuing the record breakers. |
| B．The Australian navy was not something intended for rescue work. |
| C．The record breakers should pay for their insurance premiums themselves. |
| D．A great number of people try to break records in the seas around Australia. |
| A．It’s All Been Done Before | B．Never Do Something New |
| C．You Are the Next Record Breaker | D．Be Responsible for Your Adventures |
【推荐2】Are you aware that every single person on this planet who has ever lived, lives now or will live, has a different perception of reality? The way each of us perceives the world is to some degree different than any other person's perception of reality. __①__ What is absolutely real and right for you may be an illusion, or nonexistent, or completely false for another!
It's important to know this. __②__ For example, the news media loves to create drama, and one of their favorite methods is to elicit(引起) fear: fear of other people, fear of the weather, fear of the economy, etc. The news media tells us how to perceive the world—and if a person takes the newscasters at their word, they perceive the world to be very dangerous and hostile. To that person，the mental images and emotions suggested by other people create a version of reality that is completely different from the reality perceived by someone who does not watch the news.
Things are not always what they seem. For most people, seeing is believing, which is why magicians, artists and marketers are so successful. Just like the TV news, they show you only what they want you to see and it is perceived as reality. But how would that reality change if you saw what went on behind the scenes or what was left out?
What's your story?
We all have a story. Over time, your story takes on a life of its own and you become your story. But who's the author and why did him put so much crap in there? All that unnecessary suffering, struggle, heartache, worry and pain... wouldn't it be better to live a story without all that? Who wants to live in a story with that much boredom and unfulfilled longings?
The story got its start when you were born, and was coauthored by you along with the influences in your life. __③__ Anytime you were influenced by someone or something, you unconsciously handed your pen over and said “Here, you write this about me.” So you are not even writing your OWN story! No one does—until they recognize that fact, and make a conscious decision to take control of the pen. You CAN write your story the way you want it to play out.
________________
It is helpful to understand how the brain takes reality and filters it to create your unique perception of reality. It's an automatic unconscious action that is based on：
● Physical experiences (which is why some optical illusions are extremely unsettling)
● Past conditioning (how you are programmed to see the world)
__④__ When you become aware of the fact that you are constructing your own reality, you can take charge and build one that is more pleasing. If you change your mind, your vibration and your intentions, you can change your circumstances! Instead of, “I am a victim of circumstance，” imprint in your mind, “I am the cocreator of my life”； Instead of, “I am sick and tired of...” imprint in your mind，“I am in control and enthusiastic about what I do”.
Raise your vibration by thinking, talking and acting more positively. As positiveness becomes a mental habit，that change will become your new inner reality, which will soon manifest in your outer reality.
The power of perception is immense. Choose to see more good than bad, more abundance than lack, more love than indifference and more success than struggle.
1. What does the underlined word “perception” mean in the first paragraph?| A．sense | B．acceptance |
| C．reception | D．deception |
| A．By answering questions. | B．By giving examples. |
| C．By making comparisons. | D．By drawing conclusions. |
| A．① | B．② | C．③ | D．④ |
| A．Seeing is not believing |
| B．Live up to your expectations |
| C．Change your perception and create a new reality |
| D．Physical experiences and past conditioning really count |
| A．Instructive. | B．Humorous. |
| C．Critical. | D．Ironic. |
【推荐3】A few years ago, the City Council of Monza, Italy, barred pet owners from keeping goldfish in curved fishbowls. The sponsors of the measure explained that it is cruel to keep a fish in such a bowl because the curved sides give the fish a distorted view of reality. Aside from the measure’s significance to the poor goldfish, the story raises an interesting philosophical question: How do we know that the reality we perceive is true?
Physicists are finding themselves in a similar trouble to the goldfish’s. For decades they have been pursuing an ultimate theory of everything—one complete and consistent set of fundamental laws of nature that explain every aspect of reality. It now appears that this pursuit may generate not a single theory but a family of interconnected theories, each describing its own version of reality, as if it viewed the universe through its own fishbowl. This concept may be difficult for many people to accept. Most people believe that there is an objective reality out there and that our senses and our science directly convey (传达) information about the material world. In philosophy, that belief is called realism.
In physics, realism is becoming difficult to defend. Instead, the idea of alternative realities is a mainstay of today’s popular culture. For example, in the science-fiction film The Matrix the human race is unknowingly living in a simulated (模拟的) virtual reality created by intelligent computers. How do we know we are not just computer-generated characters living in a Matrix-like world? If—like us—the beings in the simulated world could not observe their universe from the outside, they would have no reason to doubt their own pictures of reality.
Similarly, the goldfish’s view is not the same as ours from outside their curved bowl. For instance, because light bends as it travels from air to water, a freely moving object that we would observe to move in a straight line would be observed by the goldfish to move along a curved path. The goldfish could form scientific laws from their frame (框架) of reference that would always hold true and that would enable them to make predictions about the future motion of objects outside the bowl. If the goldfish formed such a theory, we would have to admit the goldfish’s view as a reasonable picture of reality.
The goldfish example shows that the same physical situation can be modeled in different ways, each employing different fundamental elements and concepts. It might be that to describe the universe we have to employ different theories in different situations. It is not the physicist’s traditional expectation for a theory of nature, nor does it correspond to our everyday idea of reality. But it might be the way of the universe.
1. What does the underlined word “distorted” in Paragraph most probably mean?| A．Original. | B．Accurate. | C．Distant. | D．False. |
| A．The need for a complete theory. | B．The lasting conflict in physics. |
| C．The existence of the material world. | D．The conventional insight of reality. |
| A．Nature’s mysteries are best left undiscovered. |
| B．An external world is independent of the observers. |
| C．People’s theories are influenced by their viewpoints. |
| D．It is essential to figure out which picture of reality is better. |
| A．various interpretations of the universe are welcomed |
| B．physicists have a favorite candidate for the final theory |
| C．multiple realities can be pieced together to show the real world |
| D．there is still possibility to unify different theories into a single one |
【推荐1】Royal Dutch Shell is launching a $ 300 million and forestry program, at a time when an increasing number of oil companies are putting money in carbon offset (碳补偿)plans to meet climate goals. The company will spend the money over the next three years on projects to store carbon, including large forests in the Netherlands and Spain, and will start offering motorists the option of purchasing carbon offsets when they buy petrol at the pump.
The executives of the company explained that these carbon offset projects were a new business opportunity for Shell, as well as a way to meet its climate targets. “We believe that over time we will be building a business, because these carbon credits will become more valuable as carbon becomes more limited," they said. Shell recently decided to cut its net carbon footprint (碳排放)by 2-3 percent in five years, which includes emissions (排放)from the products it sells. The company plans to produce carbon credits from the forestry projects, then sell these credits on to customers buying its oil and gas products, or apply the credits to its own operations to lower its carbon footprint.
Plants absorb carbon dioxide as they grow and restoring forests and other natural areas is considered one of the simplest ways to store carbon. However, the voluntary market for carbon credits based on forestry projects has its critics, as projects in developing countries can be hard to monitor. Shell's move has also been criticized by some environmentalists. They worried that there was a risk of " greenwash when companies invested in forestry projects. "There is an entire debate about whether forestry projects truly reduce emissions or not," they said, pointing out that planting in one area could cause deforestation (滥伐森林)to another.
Shell said it would rely on the third party to ensure its forest program to meet the Voluntary Carbon Standard and strict biodiversity requirements. Mark Lewis, head of climate change investment research at BNP Paribas, said, " Planting trees to offset emissions, as far as it goes, is a step in the right direction."
1. What is popular among oil companies these days?| A．Studying climate changes. |
| B．Launching forestry programs. |
| C．Working out carbon offset plans. |
| D．Attracting motorists to buy their petrol. |
| A．By quitting the emissions of its products. |
| B．By reducing its carbon footprint by a quarter. |
| C．By limiting the oil used by its own operations. |
| D．By putting carbon credits it produces on the market. |
| A．The projects can't really stop carbon emissions. |
| B．The projects are hard to monitor in poor countries. |
| C．The projects may lead to deforestation in other forests. |
| D．The projects haven't met strict biodiversity requirements. |
| A．Discount. | B．Cheat. |
| C．Decline. | D．Change. |
【推荐2】As you move around your home, take a good look at the things you have. It is likely that your living room will have a television set and a video, and your kitchen a washing machine and a microwave oven. Your bedroom drawers will be filled with almost three times as many clothes as you need. You almost certainly own a car and possibly a home computer, holiday abroad at least once a year and eat out at least once a week.
Now, perhaps, more than ever before, people are wondering what life is all about, and what it is for. Seeking material success is beginning to trouble large numbers of people around the world. They feel that the long-hours work culture to make more money to buy more things is eating up their lives, leaving them very little time or energy for family or pastimes. Many are turning to other ways of living and downshifting is one of them.
Six percent of workers in Britain took the decision to downshift last year. One couple who downshifted is Daniel and Liz. They used to work in central London. He was a newspaper reporter and she used to work for an international bank. They would go to work by train every day from their large house in the suburbs, leaving their two children with a nanny (保姆) . Most evenings Daniel wouldn’t get home until eight or nine o'clock, and nearly twice a month he would have to fly to New York for meetings. They both earned a large amount of money but began to feel that life was passing them by.
Nowadays, they run a farm in the mountains of Wales, “I always wanted to have a farm here,” says Daniel, “and we took almost a year to make the decision to downshift. It’s taken some getting used to , but it’s been worth it . We have to think twice now about spending money on car repairs and we no longer have any holidays. However, I think it’s made us stronger as a family, and the children are a lot happier.”
Liz, however, is not quite sure. “I used to enjoy my job, even though it was hard work and long hours. I’m not really a country girl, but I suppose I’m gradually getting used to looking after the animals. One thing I do like, though, is being able to see more of my children. My advice for other people wanting to do the same is not to think about it too much or you might not do it at all.”
1. When Daniel was a reporter, he .| A．lived in central London | B．disliked his job |
| C．missed his children | D．was well paid |
| A．was easy to organize | B．has improved family life |
| C．was extremely expensive | D．have been a total success |
| A．Child-caring. | B．Liz’s advice. |
| C．Downshifting. | D．Liz’s job. |
| A．repairing your car by yourself |
| B．spending money carefully |
| C．moving out to the countryside to live a simpler and better life |
| D．living in a big house in the suburbs and dining out once a week |
【推荐3】You can’t walk into the office without Rihanna’s voice singing “work work work work work work” in your head. And that one line from Lady Gaga’s “Bad Romance” still makes you want to scream. These are commonly known as earworm songs—those sticky tunes that continue to play in your head. A recent study finds that more than 90% of adults report hearing earworm songs on a weekly basis.
Fortunately, most people report earworm songs as pleasant. But others find them annoying or even maddening. “Some people are troubled by them to the point that it disturbs life,” says Elizabeth Hellmuth Margulis, a professor at the University of Arkansas who has studied earworm songs.
Margulis says earworm songs tend to have some predictable characteristics. For one thing, they tend to small parts of a song—not the whole track. And “the songs you’ve heard recently also have the most possibility to get stuck in your memory,” she says.
But sometimes something strange and unpredictable can also start a track paying in your head. “Once I was at the doctor’s office and saw a poster of a man who I thought looked like Gaston—a character from Beauty and the Beast,” Margulis recalls. A couple minutes passed, and she realized she couldn’t get “Be Our Guest”, the song in the movie, out of her head, even though she hadn’t thought of the tune in years. In that instance, she was able to identify her earworm’s trigger: the Gaston-looking man in the poster. “But the connections can be really unclear,” she says.
Margulis points out that, in all of human history, recorded music is a very new phenomenon. She says some have inferred that earworm songs are also new—the unintended consequence of being able to hear the same song played everywhere in the same way over and over again. So far, the convincing explanation for why human beings experience earworm songs remains a mystery. But there are some well-established ways to cast off the earworm songs.
“Finding a mentally demanding task and putting your mind on it usually shifts attention away from internal music. People tend to get earworms when performing tasks that don’t require their full attention—stuff like doing the dishes,” Margulis says.
Chewing gum can also help. When a song is stuck in our heads, it’s almost like we’re singing along with it. If you make your mouth do something else—chewing gum, eating a meal or talking with a friend—that can kick out the earworm.
You could also face your enemy. By listening to the full track that includes the passage stuck in your head, you may find “closure” and relief.
1. Which of the following is most likely to be an earworm song?| A．A song made up of simple words. |
| B．A song heard frequently these days. |
| C．A song sung by a most famous singer. |
| D．A song learned during one’s childhood. |
| A．Type. | B．Tune. |
| C．Cause. | D．Characteristic. |
| A．result from modern technology | B．be experienced over meals |
| C．help regain lost memories | D．hurt one’s hearing |
| A．Why we hear earworm songs. | B．Where to find earworm songs. |
| C．When we hear earworm songs. | D．How to get over earworm songs. |
【推荐1】If you could change your child’s DNA in the future to protect them against diseases, would you? It could be possible because of technology known as CRISPR-Cas, or just CRISPR.
CRISPR involves a piece of RNA, a chemical messenger, designed to work on one part of DNA; it also uses an enzyme (酶) that can take unwanted genes out and put new ones in, according to The Economist. There are other ways of editing DNA, but CRISPR will do it very simply, quickly, and exactly.
The uses of CRISPR could mean that cures are developed for everything from Alzheimer’s to cancer to HIV. By allowing doctors to put just the right cancer-killing genes into a patient’s immune system, the technology could help greatly.
In April scientists in China said they had tried using CRISPR to edit the genomes (基因组) of human embryos. Though the embryos would never turn into humans, this was the first time anyone had ever tried to edit DNA from human beings. With this in mind, the US’ National Academy of Sciences plans to discuss questions about CRISPR’s ethics (伦理问题).
For example, CRISPR doesn’t work properly yet. As well as cutting the DNA it is looking for, it often cuts other DNA, too. In addition, we currently seem to have too little understanding of what DNA gives people what qualities.
There are also moral questions around “playing God”. Of course, medicine already stops natural things from happening —— for example, it saves people from infections. The opportunities to treat diseases make it hard to say we shouldn’t keep going.
A harder question is whether it is ever right to edit human germ-line (种系) cells and make changes that are passed on to children. This is banned in 40 countries and restricted in many others. However, CRISPR means that if genes can be edited out, they can also be edited back in. It may be up to us as a society to decide when and where editing the genome is wrong.
Also, according to The Economist, gene editing may mean that parents make choices that are not obviously in the best interests of their children: “Deaf parents may prefer their children to be deaf too; parents might want to make their children more intelligent at all costs.”
In the end, more research is still needed to see what we can and can’t do with CRISPR. “It’s still a huge mystery how we work,” Craig Mello, a UMass Medical School biologist and Nobel Prize winner, told The Boston Globe. “We’re just trying to figure out this amazingly complicated thing we call life.”
1. What is the article mainly about?| A．How CRISPR was developed by scientists. |
| B．What we can and can’t do with CRISPR. |
| C．Chinese scientists’ experiment of using CRISPR to edit human embryos. |
| D．The advantages of CRISPR and arguments about its ethics. |
| A．is very safe because it only cuts the DNA it is looking for |
| B．is banned in 42 countries and restricted in many others |
| C．could cause parents to make unwise choices for their children |
| D．could help us discover the link between DNA and the qualities it gives people |
| A．could be helpful in the treatment of cancer and HIV |
| B．allows scientists to edit genomes for the first time |
| C．is a technology that uses an enzyme to work on RNA and DNA |
| D．has proven to be the most effective way to protect children against diseases |
| A．Supportive. | B．Worried. |
| C．Negative. | D．Objective. |
【推荐2】In 1953，a mountain climber reported seeing a bar-headed goose soar over the peak of Mount Everest (珠穆朗玛 ). It was thought impossible. Now researchers who raised 19 of the geese—named for the black stripes on the backs of their heads—have shown the birds really fly so high.
The team trained the youngsters to fly in a large wind tunnel wearing backpacks and face masks full of sensors that recorded their heart rate. blood oxygen levels, temperature, and metabolic rate—how many calories they burned per hour. The researchers simulated(模拟)10w-, medium-, and high-altitude conditions by altering the concentration of oxygen supplied to face masks worn by each goose as it flew in the tunnel.
Birds already have a better heart and lungs than mammals for sustained physical activity. And researchers knew that bar-headed geese have even larger, thinner lungs that let them breathe more deeply and an even bigger heart to pump more oxygen to muscles than other birds.
The wind tunnel experiments showed that when the concentration of oxygen was at its lowest-like the 7% found on top of Mount Everest versus 21% at sea level—the geese's heart rate and frequency of wing beats remained the same even as their metabolic rate dropped. Somehow, the birds managed to cool down their blood-the measured blood temperature droppedso it could take in more oxygen, the researchers report today in eLife. This cooling likely helps compensate for the very thin air, the team says.
Although well trained, the birds were only willing to stay in the air a few minutes-or Iesswhen wearing their backpacks and flying at 6ihigh" altitudes. So it's not clear whether these adaptations alone are what make it possible to fly the 8 hours it takes to climb over Mount Everest. But those few minutes showed these geese really could fly over the top of Mount Everest.
1. Why did the researchers raise 19 bar-headed geese and train them?| A．To test the flying height and speed of them. |
| B．To confirm they could fly over Mount Everest. |
| C．To observe them flying through the wind tunnel. |
| D．To see how many calories they burned per hour. |
| A．It was carried out at very high altitude. |
| B．The geese managed to breathe less when their blood decreased. |
| C．The geese could live through the lowest concentration of oxygen. |
| D．It shows the geese could fly at high altitude for long. |
| A．Whether they have super hearts and lungs. |
| B．Whether they have muscles pumped more oxygen to. |
| C．Whether they are willing to wear backpacks and face masks. |
| D．Whether they can manage to fly 8 hours to climb over Mount Everest. |
| A．A science fiction. |
| B．A climbing guide. |
| C．A travel brochure. |
| D．A science report. |
【推荐3】Sea urchins (海胆) are small creatures, but what’s really remarkable about them is that they eat anything that happens to float by. They have really sharp teeth they use to rid rocks of algae (海澡), which makes them pretty valuable especially in places like Hawaii where algae are threatening the coral reefs. In the summer of 2019, 500,000 of them were used to deal with the algae.
The problem started when non-native algae were introduced to the ecosystem of Kane’ohe Bay in the 1970s. Because they had no enemies, they ended up taking over the bay, according to the National Marine Fisheries Service (NMFS). The algae blocked sunlight from reaching the coral, which in turn affected the local fish because they changed the chemistry of the water.
That's when the NMFS turned to sea urchins that loved to devour the algae. But they had to grow to the size of a cherry tomato before they could be used. Since 2011, sea urchins have been grown and used to handle the algae problem. Some of the funds are available due to an unfortunate incident.
In 2005, a ship was grounded on a shallow reef near Kane’ohe Bay. When the ship was removed, 20 acres of reefs have been damaged. When there is environmental damage, the NMFS and other agencies receive funds from the wrongdoers and the funds are used to restore the damage. Some funds were spent on other projects like the sea urchins.When they are large enough, divers carefully place them on the reef.
Algae isn’t the only thing that threatens the coral reefs. Climate change and the effects of fishing and tourism in the area also endanger the coral reefs. But turning to sea urchins instead of man-made solutions seems like the best way to go.
1. Why are sea urchins regarded as outstanding creatures?| A．They are tiny but have teeth. | B．They can keep the ocean clean. |
| C．They are useful in removing algae. | D．They grow on coral reefs with algae. |
| A．They helped the coral reefs to survive. | B．They spread to every corner of the bay. |
| C．They didn’t fit in with the new surroundings. | D．They fought against other species to get food. |
| A．Eat. | B．Block. | C．Tease. | D．Attract. |
| A．Relying on humans’ solutions. | B．Banning fishing and tourism. |
| C．Employing divers to handle algae. | D．Letting nature take care of nature. |
