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 . 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. |
3 . In a recent announcement, Harvard and the Massachusetts Institute of Technology（MIT）said that they have joined forces to offer free online courses in an effort to attract millions of online learners worldwide.
Beginning this fall, a number of courses developed by teachers at both universities will be offered online through a new $60 million program, known as edX. “Anyone with an Internet connection anywhere in the world can use our online courses,” Harvard President Drew Faust said during a meeting to announce the plan.
MIT has offered a program called OpenCourseWare for ten years that makes materials from more than 2,000 classes free online. It has been used by more than 100 million people. In December, the school announced it also would begin offering a special certificate, known as MITx, for people who complete certain online courses. Harvard has long offered courses to a wider population through a similar program.
The MITx will serve as the foundation for the new learning platform.
MIT President Susan Hockfield said more than 120,000 people signed up for the first MITx course. She said Harvard and MIT hope other universities will join them in offering courses on the open-source edX platform.
“Fasten your seatbelts,” Hockfield said.
Other universities, including Stanford, Yale and Carnegie-Mellon, have been experimenting with teaching to a global population online.
The Harvard-MIT program will be monitored by a not-for-profit（非盈利的）organization based in Cambridge, to be owned equally by the two universities. Both MIT and Harvard have provided $30 million to start the program. They also plan to use the edX platform to research how students learn and which teaching methods and tools are most successful.
1. According to this text, edX is _______.| A．a part of the free MIT OpenCourseWare |
| B．a free computer program by MIT and Harvard |
| C．a Harvard-MIT platform of free online courses |
| D．a free program online for universities worldwide |
| A．Universities have been trying online courses. |
| B．About 2,000 online courses have been offered. |
| C．Over 100 million people have finished courses online. |
| D．Stanford and Yale together have courses similar to edX. |
| A．Get ready for the difficulties |
| B．Get ready for this educational change |
| C．Get prepared to complete the online courses |
| D．Get prepared to make materials for the edX courses |
| A．It is first offered as part of the edX learning program. |
| B．It is another free MIT-Harvard online learning program. |
| C．It is a standard to recognize online learners’ achievement. |
| D．It is a new kind of free online course of Harvard and MIT. |
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. |
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. |
