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dump millions of pounds of carbon dioxide into the atmosphere every year. By 2050, emissions (排放)
from planes are expected to become one of the largest contributors to global warming.
That's why researchers at MIT are designing a completely new type of airplane for NASA that will
enable greener airplanes to take flight before 2050.
The 180-passenger D"double bubble" series was designed to replace the Boeing 737 class aircraft, the
most popular jetliner in the world right now. The design is called a "double bubble" because it uses two
partial cylinders (气缸) placed side by side. Those two cylinders create a wider structure that looks like two
soap bubbles joined together.
In today's commercial airplanes, air flows directly into the engines located on the plane's wings. That
high-speed air flow drags on the plane, and requires more fuel to overcome the design inefficiency.
MIT's design changes all that. By moving the engines to the plane's tail, they take in slower moving air
present in the wake of the fuselage (机舱). Less drag means less fuel is needed to get the plane the same
distance.
Burning less fuel can help passengers' wallet as well as the environment. The environmental implications
of saving energy are as just as clear: the fewer emissions that planes spout into the atmosphere, the healthier
our planet.
But for passengers, we still have a couple decades to wait before any of these planes make it onto the
runway. NASA's goal is to make sure the planes that MIT has designed can take off by 2035.
B. it will hold more passengers
C. it is designed to save fuel
D. it needs no runways to take off
B. Airplanes are very noisy for the environment
C. MIT's new design will save passengers' money
D. It's expected that NASA's goal will be realize by the year 2035.
B. Researchers are designing greener aircraft
C. Passengers will enjoy lower prices
D. Airlines attract passengers with new planes
B. Science fiction
C. Travel diary
D. Business magazine
阅读下列短文，根据所读内容在文章后表格中的空格中填入恰当的单词。
注意：每个空格只填入一个单词。
About six years ago, I was eating lunch in a restaurant in New York City when a woman and a young boy sat down at the next table. I couldn’t help overhearing parts of their conversation. At one point the woman asked, “ So, how have you been?” And the boy---who could not have been more than seven or eight years old replied, “Frankly, I’ve been feeling a little depressed lately.”
This incident(小事) stuck in my mind because it confirmed my growing belief that children are changing. As far as I can remember, my friends and I hardly found out we were “ depressed” until we were in high school.
The evidence of changes in children has increased steadily in recent years. Children don’t seem childlike anymore. Children speak more like adults, dress more like adults and behave more like adults than they used to.
Whether this is good or bad is difficult to say, but it certainly is different. Childhood as it once was no longer exists. Why?
Human development is based not only on natural biological states, but also on patterns of access to social knowledge. Movement from one social role to another usually involves learning the secrets of the new situation. Children have always been taught adult secrets, but slowly and in gradual stages: traditionally, we tell sixth graders things we keep hidden from fifth graders.
In the past 30 years, however, a secret-revelation(提示) machine has been installed in 98 percent of American homes. It is called television. Television passes information, and indiscriminately (不加区分地), to all viewers alike, whether they are children or adults. Unable to resist the temptation（诱惑）, many children turn their attention from printed texts to the less challenging, more vivid moving pictures.
Communication through print, as a matter of fact, allows for a great deal of control over the social information to which children have access. Reading and writing involve a complex code of symbols that must be memorized and practiced. Children must read simple books before they can read complex materials.
Title: _______ in Today’s Children
| Main comparisons | Contexts |
| Different(_______ | Children in the past just did what they were______ to. |
| Children today act as if they were . | |
| Different______ | Children in the past experienced depression in the author’s view. |
| Sometimes sadness________ to children nowadays. | |
| Different ________ to get knowledge | Children in the past got knowledge in ________ and guided stages. |
| Children nowadays get some knowledge by_______ TV without control. |
I’ve just painted the door．I’ll put a WET PAINT notice next to it, _________ somebody doesn’t realize it’s just been painted．
- A.while
- B.if
- C.in case
- D.as long as
Many people think of guys as being carefree when it comes to their appearance. But in fact, a lot of guys spend plenty of time in front of the mirror. They care just as much as girls do about their body image.
Body image is a person’s opinions and feelings about his or her own body and physical appearance. 71 . You appreciate yo
ur body for its capabilities and accept its imperfections.
72 . Here are some ideas:
Recognize your strengths. Different body types are good for different things. What does your body do well? Maybe your speed, strength, or coordination makes you better than others at a certain sport. That may be basketball, table tennis, mountain biking, dancing, or even running. Or perhaps you have non-sports skills, like drawing, painting, singing, playing a musical instrument, writing, or acting, 73 .
Exercise regularly. Exercise can help you look good and feel good about yourself. Good physiques (体形) don’t just happen. 74 . A healthy habit can be as simple as exercising 20 minutes to 1 hour three days a week. Working out can also lift your spirits.
Respect your body! Practicing good habits ---- regular showering; taking care of your teeth, hair, and skin; wearing clean clothes, and so on ---- can help you build a positive body image.
75 . Your body is just one part of who you are. Your talent for comedy, a quick wit (智慧), and all the other things make
you unique. So try not to let small imperfections take over.
A. Use this as an opportunity to discover what you’re good at.
B. Be yourself.
C. Having a positive body image means feeling satisfied with the way you look.
D. Just explore talents that you feel good about.
E. They take hard work, regular workouts, and a healthy diet.
F. The good news is that self-image and body image can be changed.
G. So, what can you do to develop a positive body image?
查看习题详情和答案>>It’s obviously true that not all people like to work, but everyone likes to play. All over the world, men and women, young and old, enjoy recreational activities. So, beyond doubt, entertainment plays an important role in our daily lives. In modern society, there is a broad range of recreational activities—from online computer games to lovely picnics—that meet the needs of different groups of people. Therefore, it won’t be difficult for you to find some recreation to refresh your body and mind.
Recreational activities have a number of benefits, especially in this highly competitive society. They can help us relax, have fun and relieve stress. In fact, I believe there is no better way to get exercise and relieve stress than to take an active part in recreational activities. But can recreational activities do us harm? Of course they can. Let’s take TV as an example. There is no denying that TV offers access to the latest news and to useful knowledge, while providing us with entertainment. However, if we spend too much time watching TV, it will numb our mind and destroy our creativity, which is exactly the opposite of what we really want. What’s more, TV can also show some pornographic programs, which are absolutely unsuitable for us young students. So, just as the old saying goes, every coin has two sides, and watching TV is no exception.
As a student, I think recreational activities are very important for us. But this doesn’t mean we should take up whatever recreational activities are available. Instead, we should strike a balance between work and rest. We should have our own judgment, which means knowing what is good for us and what is not. And we should exercise self-control so as not to become addicted to them. I believe moderate recreational activity will benefit us in many ways and help us live a full, meaningful life.
Why does entertainment play an important role in people’s daily lives?
A. Because online computer games are popular with people.
B. Because entertainment can help people have fun instead of relieving stress.
C. Because people of all ages enjoy recreational activities.
D. Because it is easy and convenient to take up any recreational activity.
Which of the following statements is not counted as the disadvantage of TV?
A. People are addicted to watching TV.
B. TV provides people with the latest news.
C. Some programs are unsuitable for young students.
D. Spending too much time on it may destroy people’s creativity
In the author’s opinion, what is the proper attitude to recreational activities?
A. Spending as much time as we like watching TV.
B. Taking part in any recreational activities available.
C. Learning to control ourselves about entertainment.
D. Benefiting us by taking part in different activities.
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