Just as regulation has helped increase fuel efficiency, cut exhaust smokes and introduce anti-slip equipment, so government involvement is needed to get the connected car on the road. It is beginning to happen. Earlier this year, Europe’s standards-setting agencies agreed a common set of agreements for cars and traffic infrastructure (基建) to communicate. Others should follow. Governments should then set firm deadlines for all new cars to be fully connected and capable of matching, and a date for existing cars to be re-improved with a basic locator beacon (定位器) and the ability to receive risky warnings.
If cars are to connect, new infrastructure will have to be built. Roads and parking spaces will need sensors to monitor them; motorways will need specific lanes for matching. But this will not necessarily be expensive. Upgrading traffic signals so they can be controlled remotely by a central traffic management system is a lot cheaper than building new roads.
The sooner these changes are made, and cars are plugged into a smart traffic section, the quicker Singaporean variable pricing — for parking as well as road use — can become the criterion. Motorists will then have the motive, as well as the ability, to avoid the busiest places at the busiest times, and the horrible death that roads take in human lives should start falling.
In the past, more people driving meant more roads, more jams, more death and more smokes. In the future, the connected car could offer mankind the pleasures of the road with rather less of the pain.
1. What do governments truly expect of the connected car?| A．It’ll be standard-friendly. | B．It’ll get fully prepared soon. |
| C．It’ll be under command. | D．It’ll promote infrastructure. |
| A．More sensors are offered by the companies. |
| B．More special roads are needed by motorists. |
| C．The whole project is more economical to operate. |
| D．The whole society is crazier about the new cars. |
| A．Motorists. | B．Singaporeans’ pricing. |
| C．Road death. | D．Traditional traffic sections. |
| A．Positive. | B．Critical. |
| C．Objective. | D．Doubtful. |
相似题推荐
【推荐1】The bike-sharing companies that are powering a transportation revolution in China’s urban centers are not like those in the rest of the world. Their bikes have no docking ports or assigned zones for parking. Instead, riders open their smartphone apps, hop on, and start riding. So easy!
In 2015, Ofo, China’s bike-share pioneer, launched its first fleet of bicycles in Beijing. The bikes’ bright yellow frames were soon met by the orange-rimmed（镶边）, basket-equipped models launched by Mobike, Ofo’s main competitor today. In little over a year, the two companies have had a huge impact on revitalizing (重振) cycling in China, particularly among young people.
Ofo placed 1 million bicycles across 35 cities and registered 15 million users in its first years, while Mobike has now gained more than 10 million unique users and bicycles in 21 cities. Inspired by their success, at least 10 other companies have jumped into the market, launching their own app-powered, brightly colored bikes in quick succession. But Mobike and Ofo are far ahead of them.
The two industry leaders each take a different marketing method to a similar product. The Mobike app uses GPS to display bikes’ locations to users. They can use the map to reserve a bike and walk over to it. A scan of the bike’s QR code (二维码) unlocks the bike, and when users manually（手动地） lock the bike at the end of their trip, the app records the trip’s end and the bike will pop back up on the map as available. Equipped with this wireless technology, Mobikes cost between 1,000 and 3,000 yuan. Rides cost 1 yuan for an hour or a half hour, depending on whether a user chooses a “Lite” or regular bike, and the deposit (押金) required to the service is 299 yuan.
Ofo, meanwhile, is devoted not just to producing its own bikes, which have slim yellow bodies and cost about 250 yuan, but also to connecting existing bikes to its network----- a philosophy that begins with the practice of 2000 bikes offered to a campus bike-share program. The 2000 bikes were the first generation of Ofo. Yet the majority of the company’s bikes are currently ones that have been specially manufactured and fitted with their lock system. Unlike Mobike,Ofo bikes themselves are offline: their locations are tracked through users’ cell phones. Users find a free bike, enter the license plate number into their app, and receive the bike unlock code. When they have reached their destination, they end the ride on the app and manually lock the bike. Rides cost 1 yuan for an hour and the deposit is 99 yuan.
1. Which of the following statements is TRUE according to the passage?| A．The bike rides based on apps are available whenever you need. |
| B．The bike body in bright color only attracts young people to choose cycling. |
| C．Ofo knows their bikes’ location by scanning the bike’s QR code. |
| D．The bikes are locked automatically when the users reached their destination. |
| A．successful experience. | B．movement to action. |
| C．continuous process . | D．production line. |
① no need for online condition.
② without their own lock system.
③ not only to produce ofo bikes but also put existing ones to use.
④ to unlock the bike through app.
⑤ to lock the bike by QR code
| A．①②⑤ | B．②③④ |
| C．②④⑤ | D．①③④ |
| A．Bike-sharing business models: Mobike and Ofo. |
| B．A real transportation innovation（创新）: app-powered bicycles. |
| C．The successful secret of two bike-sharing companies. |
| D．Cool experience of app-powered bicycles. |
【推荐2】As reported in JAMA Surgery, the researchers discovered that e-scooter(电动摩托车) injury rates had increased dramatically in just four years, rising from 6 per 100,000 in the population to 19 per 100,000. Of the estimated 14,651 e-scooter-related injuries in 2018, 4,658, or 32%, involved the head. “While most people recover from head injuries, there is going to be a subset with long-term disability and life changes,” said Dr. Benjamin Breyer.
Dr. Benjamin Breyer of the University of California, Los Angeles, pointed to a 2019 analysis of the data from two hospitals in Southern California, which found just 4.8% of injured e-scooter riders were wearing helmets.
Dr. Joann Elmore, a professor of medicine at the University of California, Los Angeles, believed that most e-scooter users are probably unaware of the risks. To make the point, she described a photo taken by a colleague. “There were two riders on an e-scooter,” she said. “No one had shoes on. There were no helmets. And the woman in front had a baby in a baby carrier.”
The new report highlights the need for more research on new technologies, said Dr. Guohua Li, a professor of epidemiology(流行病学).
“Just as there is a global network of experts working on infectious diseases, there needs to be a similar program devoted to the surveillance(监视，监察) and prevention of injuries caused by merging technologies products and lifestyles, such as e-scooters, e-sports, etc.,” Li said in an email.
“The challenge for researchers and policymakers is to keep up with the ever-changing society and protect the public from unnecessary harm caused by new technologies and products without hindering innovation,” he added.
1. What can we know from the passage?| A．E-scooter injury rates had increased due to speeding. |
| B．32% of injured e-scooter riders weren’t wearing helmets. |
| C．There is a program devoted to the prevention of injuries caused by advanced technologies. |
| D．Protection and innovation are of equal importance. |
| A．She is an anti-scooter. |
| B．The woman in front was pregnant. |
| C．She is concerned about the e-scooter users. |
| D．Most e-scooter riders often drive at high speed. |
| A．Preventing. | B．Limiting. |
| C．Developing. | D．Making progress. |
| A．To arouse people’s awareness of the risks and self-protection. |
| B．To introduce a new way of transport — e-scooters. |
| C．To ask people not to ride e-scooters any more. |
| D．To urge policymakers to make laws as soon as possible. |
【推荐3】A selection from the trolley
The trolley problem used to be a popular question in philosophical ethics(伦理学).It runs as follows: a trolley, or a train, is speeding down a track towards a junction(三叉路口). Some evildoer has tied five people to the track ahead, and another person to the branch line. You are standing next to a lever(操纵杆) that controls the junction. Do nothing, and the five people will be killed. Pull the lever, and only one person dies. What is the ethical course of action?
In a paper just published in Nature, a team of psychologists and computer scientists, led by Edmond Awad of the Massachusetts Institute of Technology (MIT), describe a different approach.
They created a website which presents visitors with a series of choices about whom to save and whom to kill. The website proved a hit. In the end it gathered nearly 40m decisions.
The strongest preferences, expressed by respondents from all over the world, were for saving human lives over animal ones, preferring to save many rather than few and prioritising children over the old.
Iyad Rahwan, a computer scientist at MIT and one of the paper’s authors, says that many people dismiss the trolley problem as pointless as it is unlikely to arise in real life. He is unconvinced. The specific situations described by the website may hardly ever occur, he says.
| A．But all sorts of choices made by the firms producing self-driving cars will affect who lives and who dies in indirect ways. |
| B．Rather than asking philosophers for their thoughts, they decided instead to ask the public. |
| C．That seems to conflict with most people’s moral preferences. |
| D．The preference for saving women, for instance, was stronger in places with higher levels of gender equality. |
| E．There were weaker preferences for saving women over men, pedestrians over passengers in the car and for taking action rather than doing nothing. |
| F．The excitement around self-driving cars, though, has made the problem famous. |
【推荐1】In the near future, we may be using our eyes to operate our smartphones and tablets, even when it comes to playing popular games like Fruit Ninja.
The Gaze Group has been developing eye controlled computer technology for nearly 20 years. But those devices have been firstly designed to help those with disabilities, and are very expensive.
“After a while, we figured out that probably the best way is to go for a mass market way,” says Gaze’s Sune Alstrup Johansen, “where everybody would have this available.”
Johansen and some of his colleagues have formed a new company, the Eye Tribe, which is hoping to develop the technology on a mass commercial level.
The technology works with the help of the computing device toward the user’s face. After making sure of the user’s eye movements, the technology is then able to easily find where a person’s eyes are moving, and then allow the eyes to control a cursor(光标).
“Our software can then determine the location of the eyes and know where you’re looking on the screen to make sure what you’re looking at,” reads an explanation on the Eye Tribe site.
There has been a gradual change toward hands free technology in recent years, particularly in the gaming world. Recently Xbox released the Kinect device, which lets users control their Xbox and play certain games using only their hands, legs and voices. But still, most of these devices have been more of a gimmick than a practical way to use one’s hands to control a mobile device. Johansen said a replaceable filter(滤光器) would be a cheap, convenient way for most consumers.
And even as companies like The Eye Tribe work to create such a product for the average user, making the eye controlled technology more accessible and less expensive will have similar benefits for physically disabled users.
For more articles on modern science, please CLICK here.
1. Which of the following is the main idea of the passage?| A．An introduction of a new device. |
| B．An introduction of smartphones. |
| C．An introduction of eye controlling technology. |
| D．An introduction of a new technology for the disabled. |
| A．a trick | B．a way | C．a lie | D．a dream |
| A．the eye controlling technology was first developed for the blind |
| B．the present developing of the technology will bring no good |
| C．there is no such a phone as we can use only with our eyes at present |
| D．the eye controlling technology is only intended for the disabled people |
【推荐2】What's the point in dining out when we can have whatever meal we want delivered to our homes as we watch movies on our giant flat-screen TVs? According to statistics from Technomic, 86% of consumers are using off-premise (非经营场所的) channels at least once a month, and a third of consumers are using it more than they did a year ago.
Most restaurants companies are chasing these trends simply to keep up with quickly changing consumer demands. Fazoli's has spent the past two years investing in its drive-through, carryout, catering and delivery businesses, and has launched a new loyalty app aimed at making carryout orders easier. These efforts have paid off so far- off-premise sales are up 18.5% over last year for the company, said Jennifer Crawford, director of off-premise sales at Fazoli's.
But, she notes that sales aren't the only benefit to giving priority to these channels.“The off-premise channel is a great opportunity to communicate and connect with a new consumer group," Crawford said.“Many of our off-premise guests have not dined in a Fazoli's or experienced our menu. With options like third-party delivery and online ordering, we have the capability to tap into potential new guests.
Sales lifts and new customer potential are great rewards, to be sure. But that doesn't mean carrying out off-premise channels comes without challenges. Crawford said a big one is the lack of control and maintaining the guest relationship.“When a guest dines in, we can provide a level of service that improves the consumer dining experience," she said, The lack of control extends into the digital experience, as third-party apps can also be an issue. “Orders are not often processed properly due to the drop-down menus and default (默认) orders in third-party software," Crawford said. She adds that staffing issues can also arise when heavy delivery periods overlap strong in-restaurant traffic and maintaining food quality and integrity (完整) during drive time is tricky with certain dishes.
Nevertheless, Crawford believes the juice is very much worth the squeeze.“Across the industry, dine-in traffic continues to decline or remain flat. If brands are not driving sales through catering, carryout and delivery, they are missing out on income," she said.
1. Why does Fazoli's invest in off-premise channels?| A．Because it wants to see the potential of its consumers. |
| B．Because it wants to keep up with the latest changes. |
| C．Because it wants to survive in the changing consumer landscape. |
| D．Because it wants to communicate and connect with its new consumers. |
| A．it is challenging to maintain quality and integrity of dishes during delivery |
| B．third-party apps cannot offer as good an experience of ordering as restaurants |
| C．third-party apps may get out of control when consumers experience online ordering |
| D．during heavy delivery periods, more staff is always needed to deal with busy dine -in traffic |
| A．Cautious. | B．Doubtful. |
| C．Ambiguous. | D．Favorable. |
| A．What challenges off-premise channels create. |
| B．How restaurants are adapting to the rise of takeout. |
| C．Why restaurants are prioritizing off-premise channels. |
| D．How important off- premise channels are for restaurants. |
【推荐3】When people think of a typical mineral mine, it’s probably underground. It’s unlikely that the picture of plants and soft greenery would cross their minds. Now, new explorations into phytomining (植物采矿) may change that viewpoint. Instead of traditionally mining metals from rocks, phytomining uses plants as an alternative source for them. Using plants to extract metals can have significant environmental benefits over rock mining.
Phytomining was first studied in 1983, but it hasn’t yet been adopted by the metals industry. In 2004, Indonesian soil scientist Tjoa took her research to Sorowako, a small town in Indonesia with one of the largest nickel (镍) mining areas, to look into plants that continued to live after years of mining. She brought samples back to her lab and found that these super plants were more than just surviving — they were growing.
The plants were absorbing and storing nickel from the soil. Large amounts of metals kill most plants, but these, known as hyper-accumulators (超富集植物), were learning to adapt. If these plants were storing metal, that meant science could find a way to extract the minerals for use and quite frankly, scientists easily did. When the shoots are harvested and burned, the metals are separated from the plant material in the ashes.
Tjoa returned to Sorowako and spent years searching for new hyper-accumulator species. After a plant is considered a possibility, there’s a simple test paper that turns pink when placed against the leaf of a hyper-accumulator plant. Two local Indonesian plants were found but there are many others still to be discovered.
Tjoa’s research caught the attention of Bijasksana, a professor of rock magnetism. Together they designed an experiment to understand magnetic susceptibility (磁化率) when plants accumulate more nickel. Their research led to the discovery of two new species of hyper-accumulators. Besides, this research serves as the basis for the potential that plants can give to the mining industry, offering great advantages to our ecosystem and toward building a more sustainable future.
1. Why did Tjoa go to Sorowako in 2004?| A．To work with the local government. | B．To study the plants surviving mining. |
| C．To improve the soil of the small town. | D．To research into underground mining. |
| A．They are rich in metals. | B．They are free of minerals. |
| C．They are very easy to discover. | D．They are too fragile to survive. |
| A．Helping more plants to survive. | B．Testing out the mining industry. |
| C．Improving the extraction efficiency. | D．Finding more hyper-accumulators. |
| A．New Creative Mining Way Meets Challenges. |
| B．Plants Can Act as Sources of Many Metals. |
| C．Scientists Can Extract Minerals from Plants. |
| D．Phytomining Replaces Traditional Mining. |
【推荐1】Henderson Island in the South Pacific Ocean has always been known for its remarkable biological diversity and untouched ecology. Now, the remote UNESCO World Heritage site that lies 3，100 miles from the closest human settlement can also lay claim to being one of the most polluted places on Earth.
Jennifer Lavers, a researcher from the University of Tasmania’s Institute for Marine and Antarctic Studies who has been studying the island for a few years, says the tiny island is home to over 38 million pieces of waste.
The amount of waste is surprising given that the island, the largest of the group of four Pitcairn volcanic islands, has no residents and is visited by scientists only once or twice every decade. However, as it turns out, humans do not need to be physically present to pollute an area. In this case, the waste is brought in by the South Pacific Gyre, an ocean current that sends garbage moving through the sea to Henderson.
What’s even worse is that the unsightly rubbish scattered (分散)across the island’s sandy beaches is just the tip of the iceberg. According to the researchers, over 68% of the waste is buried under the sand. This means their estimates, based on the waste found up to 10 centimeters below the sand, may be underestimating the full extent of the pollution.
Besides being aesthetically(审美地) unpleasing, the waste is also harmful to the island’s wildlife. Lavers and study co-author Alexander Bond discovered sea turtles that come to the island to lay eggs caught inside fishing lines. The waste is also harmful to seabirds and fish that mistake the colorful plastic pieces for food.
Environmentalists like Boyan Slat, who founded The Ocean Cleanup in 2011 after discovering “more bags than fish” while diving in Greece, are trying to clean up the mess. However, their efforts will only make a difference if we all join them by avoiding plastic altogether or reusing and recycling.
Unless we find ways to change the situation, this ever increasing pollution will cause a serious risk to the health of our planet and all its residents, including humans.
1. What do we know about Henderson Island？| A．There are no animals on it. |
| B．There are no people living on it. |
| C．It’s known for its various resources. |
| D．It’s the largest island in the South Pacific Ocean. |
| A．Humans presence caused most of the pollution on the island. |
| B．The volcanic eruption and the closest human settlement lead to the pollution. |
| C．Most of the rubbish is scattered across the island’s’ beaches. |
| D．An ocean current has carried the garbage to the island. |
| A．The impact of sea waste. |
| B．The level of sea pollution. |
| C．How to deal with ocean trash. |
| D．How to protect the island’s wildlife. |
| A．To introduce famous volcanic island. |
| B．To praise environmentalists for their efforts. |
| C．To call on people to take action on pollution. |
| D．To explain the consequences of the South Pacific Gyre. |
Description:
The National Gallery is the British national art museum built on the north side of Trafalgar Square in London. It houses a diverse collection of more than 2,300 examples of European art ranging from 13th-century religious paintings to more modern ones by Renoir and Van Gogh. The older collections of the gallery are reached through the main entrance while the more modern works in the East Wing are most easily reached from Trafalgar Square by a ground floor entrance.
Layout:
The modern Sainsbury Wing on the western side of the building houses 13th-to 15th-century paintings, and artists include Duccio, Uccello, Van Eyck, Lippi, Mantegna, Botticelli and Memling.
The main West Wing houses 16th-century paintings, and artists include Leonardo da Vinci, Cranach, Michelangelo, Raphael, Bruegel, Bronzino, Titian and Veronese.
The North Wing houses 17th-century paintings, and artists include Caravaggio, Rubens, Poussin, Van Dyck, Velaazquez, Claude and Vermeer.
The East Wing houses 18th-to early 20th-century paintings, and artists include Canaletto, Goya, Turner, Constable, Renoir and Van Gogh.
Opening Hours:
The Gallery is open every day from 10am to 6pm (Fridays 10am to 9pm) and is free, but charges apply to some special exhibitions.
Getting There:
Nearest underground stations: Charing Cross (2-minute walk), Leicester (3-minute walk), Embankment (7-minute walk), and Piccadilly Circus (8-minute walk).
1. In which wing can you see religious paintings?| A．In the East Wing. | B．In the main West Wing. |
| C．In the Sainsbury Wing. | D．In the North Wing. |
| A．Van Eyck | B．Cranach |
| C．Van Dyck. | D．Constable. |
| A．The National Gallery is the biggest British national art museum. |
| B．There are four exhibition areas in The National Gallery |
| C．The Gallery is open every day from 10am to 6pm |
| D．The Gallery is completely free |
| A．An artist magazine. | B．A tourist map. |
| C．A news report. | D．A museum guide. |
【推荐3】With so many investments required of us to succeed - time, resources, talents, responsibilities, even finances for our retirement - it’s easy to lose sight of the most difficult investment of all to commit to : ourselves.
Getting to the point where you’re ready to start upgrading to you 2.0 isn’t easy. But it doesn’t mean dropping the ball everywhere else. It’s not about omissions, but admissions. Come clean with yourself to kick-start your personal growth.
Unstuck starts with “u”
No one purposely chooses to stop learning and growing again, it just kind of happens in a lot of daily responsibilities and life. And if it were easy to just kick it into gear（ 档 位 ）again, you would have already done it. But the truth is inescapable. If you want to get off that place to higher ground, it’s up to you and only you. No one will just hand you a steady stream of opportunities for growth.
You’ve been working in your life, not on it
Activity is often confused with acceleration（忙碌）. I was guilty of this for years in working place - staying always busy but not admitting I was bored. I was lost in activity and not steeping back to take time to question what I wanted my life to be. Once I began working on my life - quitting corporate, becoming an entrepreneur, restructuring to my life - I started growing once again. And I’ve never been happier.
Things aren’t happening to you, they’re happening for you
A victim mentality（心态）is the enemy of personal growth. Lamenting over everything that has gone wrong in your life only wastes energy from working to make more things go right. If you want to kick-start growth, you must view setbacks as having a purpose, and then put them in their place. The past shouldn’t run or define you - only fuel you.
The perfect time to start doesn’t exist
I had so many things that had to be just right before I could make my long-planned leap from corporate. I’d tell myself, “I’d love to go for it right now, but practically speaking.” Well, guess what? Practicality is poison. It’s the convenient excuse stopping you from what you’re meant to become.
It’s time to unplug others’ opinions
Grow where you want to grow. Learn what you want to learn. Wherever you are on the scale of hat you want to learn next - be it beginner or near - expert own it, be proud of it. Pretenses are for pretenders. You’re just trying to become a better version of your genuine self.
1. Which of the following is TRUE according to the passage?| A．If you want to succeed, you have to invest yourself first. |
| B．Upgrading yourself is hard, but you still need to continue. |
| C．Giving up upgrading yourself is just like dropping the ball. |
| D．It’s a kind of responsibility to go on learning though it’s hard. |
| A．to express sadness and feeling sorry about something |
| B．to repeat what happens to you in the past of your life |
| C．to show some regretful feeling or thought for our past |
| D．to recognize something that has gone wrong in the past |
| A．the busier you are, the happier and better you will be |
| B．what happened shouldn’t prevent you, but protect you |
| C．whoever you are, just grow where you want to grow |
| D．how well you grow is actually decided by yourself |
| A．3 | B．7 | C．5 | D．6 |
【推荐1】5G, the fifth generation of wireless, promises lightning-fast download speeds and could lay foundation for high-tech advancements like self-driving cars. But like many new technologies, it's causing concern about potential health issues.
The first generation of wireless introduced mobile phones, and 2G brought texting. 3G laid the groundwork for smart-phones, and 4G allowed video streaming and more. 5G is expected to download data 20 times faster than its predessor(前任)，and some experts argue it could be much faster.
Too much of a good thing?
It's not just about streaming data faster, it's about streaming more of it. On a 5G network, a user can download a movie instantly, and data will flow between connected objects without delay. The amount of data people use on mobile devices has gone up 40 times since 2010 and is only expected to increase. 5G networks are wireless companies attempts to satisfy that demand.
Uncertain effects
The untested nature of 5G, and the extensiveness of its infrastructure( 基础设施） has some worried that the increased exposure could have serious health effects. Wireless safety advocates（倡议人士）have called for more studies on the effects of the exposure, and one group is trying to stop the installment of 5G networks in Chicago's neighborhoods.
The federal government has safety rules that wireless companies must obey that limit human exposure to radio waves, including frequencies uses with 5G.
Wireless industry association CTIA says typical exposure to 5G infrastructure is comparable to Bluetooth devices and baby monitors, and there is no scientific evidence of negative health effects.
Still, assurances from government agencies and industry operators are not enough for Chicago resident Judy Blake. Additional studies on 5G’s health impacts likely wouldn’t soothe her either. She said, “People can't choose whether or not to be exposed to this radiation.”
“I don’t need another test. The only test that’s going to happen now is people’s lives,” said Blake, 67.
Only time will tell?
Though little is known about the long-term health impact of the millimeter waves that 5G operates on, some research has shown short-term exposure could be problematic, said Joel Moskowitz, a public health expert at the University of California at Berkeley.
The eyes and sweat glands(腺体）are among several body parts studies have shown could be at risk. Moskowitz said. Insects and plant life could also be affected, he added.
The millimeter waves used in SG are absorbed by the upper layers of skin, potentially causing the temperature of the skin to rise, said Suresh Borkar, senior lecturer in the Department of Electrical and Computer Engineering at the Illinois Institute of Technology. The effects of extended rises in skin temperature “become a big unknown,” he said.
This isn't the first time people will come into contact with millimeter waves: They're also used in airport body scanners, said Lav Varshney, assistant professor of electrical and computer engineering at the University of Illinois at Urbana-Champaign. Still, it's the first time the high- frequency waves will he used on such a scale, and concerns surrounding new technologies are common throughout history.
“When cars first started replacing horse-drawn carriages, people were afraid of what the health impacts of traveling at high speeds would be,” Varshney said. “There has always been occurrence of this fear.”
1. Which of the following is TRUE according to the passage?| A．5G is faster but not safe to human beings. |
| B．5G features faster and more in transiting. |
| C．5G can meet people's any demand in theory. |
| D．5G just makes little impact on people's health. |
| A．Millimeter waves certainly affect people's health seriously |
| B．Millimeter waves will cause the skin’s temperature to rise. |
| C．It's obvious that many scientists object to 5G technology. |
| D．It's hard to say whether millimeter waves do damage to health. |
| A．to make somebody feel calm or less worried. |
| B．to make somebody feel happy or more excited. |
| C．to make somebody feel disappointed or less satisfaction |
| D．to make somebody feel inspired or more energetic. |
| A．5G’s Advantages and Disadvantages |
| B．The Development of Wireless |
| C．5G Health Concern |
| D．5G Future Prediction |
【推荐2】Sucking blood is a risky business. At least for the female mosquitoes that need these nutrients to nurture their developing eggs. Not only do these bugs have to find a suitable blood donor, but once they've had their fill, they have to be able to escape undetected—to avoid the big swat. How they finesse this stealthy departure has just been revealed in the Journal of Experimental Biology.
Feasting(饱餐) on an unsuspecting mammal can double a mosquito's body mass. So how does a fully loaded female heave that added bulk off the skin of her host without triggering its pressure sensors and bringing on that fateful slap? To find out, Florian Muijres of Wageningen University in The Netherlands and his colleagues used cameras that record 13,500 frames per second to capture the takeoff maneuvers of 63 blood-fed malarial mosquitoes.
What they discovered is, when it comes to a soft yet speedy getaway...for female skeeters, the wing's the thing. With a wingbeat frequency of about 600 beats per second...the insects are able to lift themselves lightly off their host. That approach is the opposite of the one favored by most other winged things, says Muijres.
"When most flying animals when they take off, like birds or a fly for, example, they first use their legs to push off very hard, and then when they are in the air, then they start beating their wings and generate aerodynamic lift(气动升力) to be able to fly away. Mosquito does it the other way around. It first starts beating its wings and through the aerodynamic forces these wings generate, their body is being lifted off from the substrate. And then they do gently also push down with their long legs to be able to further power their liftoff. But these forces that are being generated by the legs are relatively small."
In fact, the faint flutter of a mosquito's wings produces less than one third of the force exerted by similar-sized but much less subtle fruit flies as they shove off in search of another banana. And even on a full stomach, these bloodsuckers are stunningly fast, says Muijres. "So takeoff phase takes only about 30 milliseconds, which is 10 times faster than how fast we can blink our eye." And they're gone before we know what hit us. And before we can hit them.
1. What does the passage mainly talk about?| A．How mosquitoes get nutrients for their developing eggs. |
| B．How mosquitoes can find their suitable blood donors |
| C．How mosquitoes escape undetected after sucking blood. |
| D．How the female mosquitoes find their perfect partners. |
| A．Their legs | B．Their ears | C．Their mouths | D．Their wings |
| A．mosquitoes are lighter than them |
| B．mosquitoes are keen on sucking blood |
| C．mosquitoes take off first with wings and then legs |
| D．mosquitoes take off through the aerodynamic forces |
| A．extremely fast | B．equal to that of our blink |
| C．faster than that of fruit flies | D．greatly affected by their full stomach |
【推荐3】Will it matter if you don’t take your breakfast? A short time ago, a test was given in the United States. People of different ages, from 12 to 83, were asked to have a test. During the test, these people were given all kinds of breakfast, and sometimes they got no breakfast at all. Scientists wanted to see how well their bodies worked when they had eaten different kinds of breakfast.
The results show that if a person eats a right breakfast, he or she will work better than if he or she has no breakfast. If a student has fruit, egg, bread and milk before going to school, he or she will learn more quickly and listen more carefully.
The result is opposite to what some people think. Having no breakfast will not help you lose weight. This is because people become so hungry at noon that they eat too much for lunch. They will gain weight (增加体重) instead of losing it. You will lose more weight if you decrease your other meals.
1. During the test, the people were given ________.| A．no breakfast at all | B．little food for breakfast |
| C．very rich breakfast | D．different foods or nothing |
| A．a person will work better if he or she only has fruit and milk |
| B．breakfast has little to do with a person’s work |
| C．breakfast has great effect (影响) on work and studies |
| D．girl students should have little for breakfast |
| A．lose weight | B．work better |
| C．be healthier | D．lose your way |
| A．增加 | B．放弃 |
| C．减少 | D．享用 |
