1 . Round and Round They Go
Space is becoming more crowded. On December 3, a Falcon 9 rocket made by Space X thundered into the sky. On board were 64 small satellites, more than any American company had launched before in one go. They have a variety of uses, from space-based- radar to the monitoring of radio-frequency- emissions.
These objects are part of the latest breed of low-Earth-orbit (LEO) satellites. This launch is just taste of what is planned. Space X and One Web, a communications firm, plan to launch satellites in their thousands, not hundreds. The pair are set to double the total number of satellites in orbit by 2027.
That promises to change things dramatically on Earth. LEO satellites can bring internet connectivity to places where it is still unavailable or unaffordable. This will also be a lasting source of new demand for the space economy. Morgan Stanley, a bank, projects that the space industry will grow from $350 billion in 2016 to more than $1. I trillion by 2040. New internet satellites will account for a half this increase.
For that to happen, however, three worries must be overcome. Debris(碎片)is the most familiar concern. As long ago as 1978, Donald Kessler, a scientist at NASA, proposed situation in which, when enough satellites were packed into low-Earth orbits, any collision could cause a chain reaction which would eventually destroy all space craft in its orbital plane(平面). The syndrome which bears Mr. Kessler's name weighs heavily on the minds of executives at the new satellite firms. Debris could cause entire tracts(广阔的一片) of space to be unusable for decades.
Solutions exist. One is to grab malfunction satellites and pull them down into Earth's atmosphere. Another is to monitor space more intensively for debris; a US Air Force program me called Space Fence is due to start in 2019. But technology is only part of the answer. Rules are needed to govern the safe disposal(清除) of old satellites from low-Earth orbit. The United States' Federal Communications Commission is revising its regulations with this in mind. Other countries should follow suit.
Cyber-security is a second, long-standing worry. Hackers could take control of a satellite and seal intellectual property, redirect data flows or cause a collision. The satellite industry has been slow to respond to such concerns. But as more of the world's population comes to rely on the infrastructure of space for access to the internet, the need for action intensifies.
The third issue follows from the first two. If a simple mistake or a cyber-attack can cause a chain reaction which wipes out hundreds of billions of dollars of investment, who is liable? Underwriters(保险商) are studying the plans of firms that wish to operate large numbers of satellites. But there is a long way to go before the risks are well understood, let alone priced.
As space becomes more commercialized mind-bending prospects open up: packages moved across the planet in minutes by rocket rather than by plane, equipment sent to other small planets, passengers launched into orbit and beyond. All that and more may come, one day. But such activities would raise the same questions as LEO satellites do. They must be answered before the space economy can truly develop.
1. What can we learn about LEO satellites from the passage?| A．They are supposed to limit the space economy. |
| B．They are expected to increase in large numbers. |
| C．They are designed to move beyond the Earth as far as possible. |
| D．They are mainly intended to bring internet connectivity to remote areas. |
| A．depending entirely on the modern technology |
| B．monitoring the movement of spaceships carefully |
| C．strengthening rules to remove old satellites safely |
| D．destroying all the satellites with problems instantly |
| A．Measure. | B．Increase. | C．Spread. | D．Repeat. |
| A．Lack of satellite regulations. |
| B．Loss of intellectual property. |
| C．Crisis of confidence in the field. |
| D．Slow response of satellite industry. |
| A．It should be further confirmed for its ownership. |
| B．It should be continued because of its advantages. |
| C．It should be done carefully to avoid potential risks. |
| D．It should be stopped in face of the space economy. |
2 . Skeptics are strange a lot. Some of them refuse to admit the serious threat of human activities to the environment and they are tired of people who disagree with them. Those people, say skeptics, spread nothing but bad news about the environment. The "eco-guilt" brought on by the discouraging news about our planet gives rise to the popularity of skeptics as people search for more comforting worldviews.
Perhaps that explains why a new book by Bjorn Lomborg received so much publicity. That book, The Skeptical Environmentalist, declares that it measures the "real state of the world" as fine. Of course, another explanation is the deep pockets of some big businesses with special interests. Indeed, Mr. Lomborg's views are similar to those of some industry-funded organizations, which start huge activities through the media to confuse the public about issues like global warming.
So it was strange to see Mr. Lomborg's book go largely unchallenged in the media though his beliefs were contrary to most scientific opinions. One national newspaper in Canada ran a number of articles and reviews full of words of praise, even with the conclusion that "After Lomborg, the environmental movement will begin to die down."
Such one-sided views should have immediately been challenged. But only a different review appeared in Nature, a respected science magazine with specific readership. The review remarked that Mr. Lomborg's "preference for unexamined materials is incredible".
A critical eye is valuable, and the media should present information in such a way that could allow people to make informed decisions. Unfortunately, that is often inaccessible as blocked by the desire to be shocking or to defend some special interest. People might become half-blind before a world partially exhibited by the media. That's a shame, because matters concerning the health of the planet are far too important to be treated lightly.
1. According to the passage, which of the following may be regarded as "skeptics"?| A．People who agree on the popularity of "eco-guilt". |
| B．People who dislike the harmful effect of human activities. |
| C．People who disbelieve the serious situation of our planet. |
| D．People who spread comforting news to protect our environment. |
| A．The book challenges views about the fine state of the world. |
| B．Some big businesses intend to protect their own interests. |
| C．The author convinces people to speak comforting worldviews. |
| D．Industry–funded media present confusing information. |
| A．find fault with Lomborg's book |
| B．voice a different opinion |
| C．challenge the authority of the media |
| D．point out the value of scientific views |
| A．To show the importance of presenting overall information by the media. |
| B．To warn the public of the danger of half–blindness with reviews. |
| C．To blame the media's lack of responsibility in information. |
| D．To encourage the skeptics to have a critical eye. |
3 . I'd done it before, and so I had no reason to believe that this time would be any different. I was sure that when I returned home from my mission trip, as always, I'd bring back nothing more than some mud on my boots, a hole or two in my jeans and, of course, a lot of great memories.
The summer before my high school graduation, I went to West Virginia with others as volunteers to repair the homes of those in need. Arriving at our destination, my group was assigned the task of rebuilding sections of a home that had been damaged by fire. No sooner had we parked on the home's dirt driveway than we saw an excited little girl, no more than six years old, standing in the doorway of the family's temporary home. Shoeless and wearing dirty clothes and the biggest smile I'd ever seen, she yelled, "Ma, Ma, they really came! " I didn't know it then, but her name was Dakota, and four more days would pass before she’d say another word near me.
Behind Dakota was a woman in a wheelchair—her grandmother, we'd soon learn. I also discovered that my job that week would be to help change a fire—damaged dining room into a bedroom for this little girl. Grabbing our tools, we went to work. Over the following days, I noticed Dakota peeking at us every now and then as we worked. A few times. I tried talking with her, but she remained shy and distant, always flying around us like a tiny butterfly but keeping to herself.
By our fifth and final day, however, this was about to change.
Before I went to work on her home on that last morning, I spoke for a moment or two with the grandmother. I was especially pleased when she told me how much Dakota loved her new room so much, in fact, that she'd begged to sleep in it the previous night, even though it wasn't quite ready. As we talked, I noticed something I hadn’t seen before—Dakota was hiding behind her grandmother. Cautiously, she stepped into view, and I could see that just like her clothes, her face was still dirty. But no amount of soil could hide those bright blue eyes and big smile. She was simply adorable. I wanted so much to hug her, but respecting her shyness, I kept my distance.
Slowly, she began walking toward me. It wasn't until she was just inches away that I noticed the folded piece of paper in her tiny hand. Silently, she reached up and handed it to me. Once unfolded, I looked at the drawing she'd made with her broken crayons on the back of an old coloring book cover. It was of two girls—one much taller than the other—and they were holding hands. She told me it was supposed to be me and her and on the bottom of the paper were three little words that instantly broke my heart. Now almost in tears, I couldn't control myself anymore—I bent down and hugged her. She hugged me, too. And for the longest time, neither one of us could let go.
By early afternoon, we finished Dakota's bedroom, and so I gladly used the rare free time to get to know my newest friend. Sitting under a tree away from the others, we shared a few apples while she told me about her life. As I listened to her stories about the struggles she and her family went through daily, I began to realize how boring various aspects of my own life were.
I left for home early the next morning. I was returning with muddy boots and holes in my jeans. But because of Dakota, I brought back something else, too—a greater appreciation for all of the blessing of my life. I’ll never forget that barefoot little butterfly with the big smile and dirty face. I pray that she’ll never forget me either.
1. From the appearance description of the little girl, we know _______.| A．she formed a bad living habit |
| B．she hoped for a better education |
| C．she was an innocent and lovely child |
| D．she was strong and calm in the inner world |
| A．Enjoy your help. |
| B．Please don’t leave. |
| C．Help me, please. |
| D．Hug me close. |
| A．She worried about the little girl’s future. |
| B．She decided to keep helping the little girl. |
| C．She felt a greater affection for the little girl. |
| D．She got surprised at the little girl’s worthless gift. |
| A．One must learn to share life experiences. |
| B．One often wants to lead a meaningful life. |
| C．One occasionally benefits from the poverty. |
| D．One should be more grateful for the gift of life. |
4 . This time of year many of us are determined to get back into shape. But if you are having trouble fitting into your tight jeans, it may not be your fault. Scientists now believe that willpower alone is not enough to lose weight. They say success depends on your genes, hormones (荷尔蒙) and psychology.
A study of 75 people by BBC Science and Oxford and Cambridge Universities has looked into why one-size-fits-all diets are often not successful. The scientists divided over-eaters into three groups—people who feast, people who constantly crave food and emotional eaters. They tailored (定制) diets to the needs of each group.
Feasters can’t stop eating once they start. This is because they don’t have the hormones that tell them when they are full. Scientists designed a diet for this group paying special attention to high protein foods that make them feel full for a long time. This included fish, chicken, basmati rice and grains. Bread and potatoes were not allowed because they do not fill you up for long.
Constant cravers always feel hungry. Scientists say that certain genes stop the messages the stomach sends to the brain saying it is full, meaning the cravers always feel like they need more fatty, sugary food. Dieting seven days a week is very hard for these people, so scientists put them on a normal, healthy diet five days a week, and eating whenever they feel stressed. To help them change this behaviour, scientists offered them group support in meetings and online as well as a diet.
During the study, people from all three groups lost weight on the tailored diets, with feasters losing the most and constant cravers losing the least.
So what about you? If any of the eating habits sound familiar, perhaps you should consider a new approach to slimming for now.
1. What is the solution that scientists suggest for feasters?
| A．Providing them with a certain hormone. |
| B．Designing a high-protein diet for them. |
| C．Reducing their calorie intake on the weekend. |
| D．Giving them group support in meetings and online. |
| A．Bread and potatoes are harder to digest than fish and chicken. |
| B．Anyone can lose weight only if he or she has strong determination. |
| C．Emotional eaters are more likely to lose weight than constant cravers. |
| D．Scientists will find one-size-fits-all diets for those who want to lose weight. |
| A．Three factors that determine our success in getting back into shape. |
| B．Three approaches to losing weight according to eating habits. |
| C．Willpower is not enough to lose weight. |
| D．A research on tailored diets. |
| [1] I am often asked to describe the experience of raising a child with a disability-to try to help people who have not shared that unique experience to understand it, to imagine how it would feel. It’s like this… [2] When you’re going to have a baby, it’s like planning a marvellous vacation trip-to Italy. You buy a bunch of guidebooks and make wonderful plans: the Coloseum①, the Michelangelo② David, the gondolas③ in Venice, etc. You may learn some handy phrases in Italian. It’s all very exciting. [3] After months of eager expectation, the day finally arrives. You pack your bags and off you go. Several hours later, the plane lands. The airhostess comes in and says, “Welcome to the Netherlands.” [4] “The Netherlands?!” you say. “What do you mean, the Netherlands?? I signed up for Italy! I’m supposed to be in Italy. All my life I’ve dreamed of going to Italy.” [5] But there’s been a change in the flight plan. They’ve landed in the Netherlands and there you must stay. [6] The important thing is that they haven’t taken you to a horrible, awful, dirty place, full of diseases. It’s just a different place. [7] So you must go out and buy new guidebooks. And you must learn a whole new language. And you will meet a whole new group of people you would never have met. [8] It’s just a place. It’s slower paced than Italy, less flashy than Italy. But after you’ve been there for a while and you catch your breath, you look around and you begin to notice that the Netherlands④ …and the Netherlands has tulips⑤. The Netherlands even has Rembrandts⑥. [9] But everyone you coming and going from Italy and they’re all boasting about what a wonderful time they had there. And for the rest of your life, you will say, “Yes, that’s where I was supposed to go. That’s what I had planned. [10] And the pain of that will never, ever, ever, ever go away because the loss of that dream is a very, very significant loss. [11] But if you spend your life regretting the fact that you didn’t get to Italy, you may never be free to enjoy the very special, the very lovely things about the Netherlands. | ① ② (1475~1564) Italian artist and architect ③  ④  ⑤  ⑥(1606~1669) Dutch painter |
1. The author compares her motherhood to ________.
| A．her involvement in traveling abroad |
| B．her experience with an unfamiliar task |
| C．her dream of enjoying beautiful scenery |
| D．her journey to an unplanned destination |
| A．the Netherlands has many scenic spots to visit and enjoy |
| B．the Netherlands is a country with many paintings to appreciate |
| C．a mother of a disabled child can also feel the bright side of her life |
| D．a mother who has traveled a lot can receive a special treat from her child |
| A．proud | B．anxious | C．sociable | D．sensible |
| A．beyond her endurance | B．more a gift than a loss |
| C．worthy of others’ sympathy | D．preferable to going to Italy |
6 . Jennifer Udler was in the middle of a 50-minute session with a patient when it started to rain. Walking and talking about anxiety and stress, she and her teenage patient got wet. But when they made it back indoors, Jennifer said, “ Hey, look at us! We’re wet, but we got through it! Now you can use that next time you have anxiety before and during an event. ” This kind of insight is key to her practice.
Jennifer, a social worker whose practice focuses on adolescents, has been a therapist （治疗师 ）for 20 years. For most of that time, she practiced in a traditional office, but she noticed how easy it was for her running partners to open up about their problems. After doing some research, in 2013, Jennifer founded Positive Strides Therapy, where she conducts sessions while walking outdoors. She conducts all of her sessions outdoors and in all kinds of weather.
“When somebody asks me if I specialize in walking therapy, I say, ‘No, that’s how I practice,’ ” Udler said. “I specialize in family systems theory. Walking in the park is just where I practice. ”
Despite the lack of formal research, Jennifer believes strongly in the benefits, saying that it can be helpful. “We’ll be talking about ‘moving forward’ as we are actually moving forward on the path, building muscle memory of how they can move forward and leave the anxiety behind. ”
And outdoor walking therapy doesn’t just benefit teens. Jennifer says the adults in her practice welcome the humanizing effect of taking therapy outdoors.
1. What lesson did Jennifer teach her teenage patient through the rain?| A．Rain and suffering are a part of life. |
| B．She is ready to help the young man. |
| C．We can beat our difficulty after all. |
| D．Rain can help us deal with our trouble. |
| A．qualification | B．foresight |
| C．awareness | D．prediction |
| A．Doubtful. | B．Confident. |
| C．Unconcerned. | D．Disappointed. |
| A．The lack of formal research about the therapy. |
| B．Building physical memory of past experience. |
| C．Treating her teen patients in a traditional office. |
| D．Conducting walk — and — talk therapy for teens. |
| A．Walking outdoors is similar to managing worries. |
| B．Moving in the rain is a bit too difficult to tolerate. |
| C．The rain can make one excited and face the trouble. |
| D．Running in the rain or storm will make one healthy. |
7 . According to a new study， teens focus on rewards and have a hard time learning to avoid punishment or consider the consequences of alternative actions.
University College London researchers compared how teens and adults learn to make choices based on the available information. They tracked the way in which 18 volunteers aged 12-17 and 20 volunteers aged 18-32 completed tasks in which they had to choose between abstract symbols.
Each symbol was consistently associated with a fixed chance of a reward, punishment, or no outcome. As the trial progressed ， participants learned which symbols were likely to lead to each outcome and adjusted their choices accordingly. Teens and adults were equally good at learning to choose symbols associated with reward， but teens were less good at avoiding symbols associated with punishment. Adults also performed significantly better when they were told what would have happened if they had chosen the other symbol after each choice， while teens did not appear to take this information into account.
“From this experimental lab study we can draw conclusions about learning during the teen years. We find that teens and adults learn in different ways， something that might be relevant to education," said lead author Dr. Stefano Palminteri. " Unlike adults, teens are not so good at learning to adjust their choices to avoid punishment. This suggests that incentive systems based on reward rather than punishment may be more effective for this age group. Additionally, we found that teens did not learn from being shown what would have happened if they made alternative choices."
To interpret the results, the researchers developed computational models of learning and ran simulations （模拟）applying them to the results of the study. The first was a simple model, one that learned from rewards, and the second model added to this by also learning from the option that was not chosen. The third model was the most complete and took the full context into account, with equal weight given to punishment avoidance and reward seeking. For example, obtaining no outcome rather than losing a point is weighted equally to gaining a point rather than having no outcome.
Comparing the experimental data to the models, the team found that teens" behavior followed the simple reward-based model while adults" behavior matched the complete, contextual model. “Our study suggests that teens are more receptive to rewards than they are to punishments of equal value, ” said senior author Dr. Sarah-Jayne Blakemore. “As a result, it may be useful for parents and teachers to frame things in more positive terms.”
1. It can be learned from the study that .| A．adults made choices faster than teens |
| B．adults understood rewards better than teens |
| C．teens reacted better to reward than punishment |
| D．teens were aware of the outcome of each choice |
| A．They reflected people’s strong desire for punishment avoidance. |
| B．They gave circumstances different degrees of consideration. |
| C．They paid equal attention to reward and punishment. |
| D．They shaped the behavior of people at different ages. |
| A．accustomed | B．opposed |
| C．sympathetic | D．responsive |
| A．“If you insist on doing things in this way， you will lose ten points. " |
| B．“If we had talked about this earlier， you wouldn’t have made the mistake. " |
| C．“ If you hand in your assignment ahead of time， you will get an extra bonus." |
| D．“If you want to approach a problem differently ， you can talk to your parents. " |
The consumer electronics industry came unbuttoned in Las Vegas this week. At the annual Consumer Electronics Show, companies from around the world unveiled many devices boasting (以拥有…而自豪) touch – sensitive technology, rather than traditional push-button controls.
Motorola, Sony, and LG Electronics all showed off touch-screen phones this week. Microsoft Chairman Bill Gates praised and offered a touch-screen computer, the Surface, related to a flat panel TV for a tabletop. Even camera makers, such as Kodak，included touch-screen LCDs in their devices. Touch-screen tech has been in use for years，but the push to develop and weave it into consumer electronics gathered steam with the June introduction of Apple’s iPhone. “The touch-screen industry is really getting hot,” says Jennifer Colegrove, a senior analyst at iSuppli. “Since the iPhone came out, there are a lot of companies that did not have a relationship with touch screens before that decided, ‘OK, I want to make a touch screen, too.’”
The touch－screen tech ecosystem now includes more than 100 companies specializing in everything from smudge-proof (防污的) screens to sensors (传感器) able to detect fingers before they even contact the screen. Sales of leading touch-screen technologies，such as those used in mobile phones and navigation (航行) devices，are expected to rise to $ 4.4 billion in 2012, up from $ 2.4 billion in 2006，according to iSuppli estimates.
1. What did the writer think about the Apple iPhone？
| A．The Apple iPhone was beautiful. |
| B．The Apple iPhone was popular. |
| C．The Apple iPhone was expensive. |
| D．The Apple iPhone was attractive. |
| A．Invented. | B．Unlocked. |
| C．Discovered. | D．Showed. |
| A．traditional push-button controls |
| B．Microsoft Chairman Bill Gates |
| C．the introduction of Apple’s iPhone |
| D．the touch-screen tech ecosystem |
| A．The touch-screen technology will disappear. |
| B．The touch-screen technology will be replaced by traditional push-button controls. |
| C．The touch-screen technology will be as important as traditional push-button controls. |
| D．The touch-screen technology will be more widely used in electronics devices. |
