Imagine working at a job which requires you to lie around all day，watch television，play video games，and surf the Internet. It seems like perfect work for a couch potato―until you find out that you must stay in bed 24 hours a day for 90 days straight！Suddenly, this job doesn't sound like much fun at all.

   A 10-year study by the National Aeronautics and Space Administration(NASA美国国家航天局) has been looking for volunteers to endure enforced(强制) bed rest,allowing doctors to study the effects of weightlessness on the human body. The bed rest recreates as closely as possible conditions which astronauts in space must endure.

   Astronauts returning from space often have temporary physical problems. Many are likely to faint(晕倒) and feel dizziness(眩晕) due to low blood pressure. A long trip in space can also lead to muscle weakness, decreased bone strength, and abnormalities(不正常) in their blood. All of these conditions are exactly like those in the best rest study.

   The studies are done at the University of Texas Medical Branch in Galveston, Texas. Vol?unteers are under the constant supervision of doctors and other healthcare workers, and must fol?low strict guidelines.

   They are not allowed out of bed even to go to the bathroom(厕所) .Meals are brought at regular times, and naps(午睡) are not permitted. At 6:00 a. m. volunteers are awakened, and lights are out at 10:00 p. m. They are supplied with televisions,videos, DVDs,and computers with Internet access. Family and friends may visit.

   To take part in the study, volunteers must be non-smokers, between 25-55 years old,and in excellent health. The volunteers can be given up to $ 17， 000 for travel expenses and lost work time.

(   ) 1. Which of the following activities will the volunteers Not do，when taking part in the study by NASA?

   A.Lying around the bed all day and all night.

   B.Watching television program all the time.

   C.Playing the video games.

   D.Playing basketball with comrades.

(   ) 2. It is true about the volunteers that        .

   A.they are quite healthy

   B.they have to pay a large amount of money on it

   C.they should be very young

   D.they must have the education of university 

(   ) 3. When astronauts return from space,          .

   A.they will have terrible illness for ever

   B.they may have some physical problems all their lives

   C.their blood pressure is likely to be lower

   D.they might become very abnormal

(   ) 4. What does the underlined word "straight" in Paragraph 1 mean?

   A. in a straight way   B. directly and quickly

   C. without stopping, continuously   D. without any movement

  I liked smoking. When I smoked with my family,I would feel so relaxed and good that 1      else in the world seemed to 2      . I thought that smoking weed(烟草) was 3       since many of my family members and people at my school smoked. Nothing ever happened to them.

4       I started smoking weed a lot more during lunch and after school. I never thought 5       of it just that I wanted to smoke. Not that it was actually 6       my mind and body. Then I be?gan to fall behind in school. I would 7       classes, come home late and spend all my money. I would spend 8       8 to 18 dollars a day. I never thought 9       that marijuana(大麻) had a bad effect on those things. Maybe my coming to class high was the reason why I was failing or coming home late. As I continued to smoke marijuana, I began to notice that I would always have the strong desire to smoke and that I would get 10       cigarettes if I smoked those，but I don't smoke marijuana. 11       I have learned more about marijuana, I have reduced 12       of marijuana that I use. I don't want drugs to be the most important in my life. I'm not smoking every day,and not spending as much money. Now that I have 13       on my habit, I am 14       more money. I，m ready to go back to school and do good,so that I can make 15       of myself. Everyone is always saying how weed 16       your mind and how it solves problems. I think it only brings more 17       . Marijuana is not good for your body or your brain. I'm not trying to tell you not to smoke, I'm just letting you know that marijuana can be 18       to your health, and in the long term it may cause some long term negative(负面的) effects. Help your?self now, 19       it is too late. I don't want to lecture anyone, just 20       my experience with you. I do still smoke, but not as often.

(   ) 1.A. something   B.nothing   C. anything   D. everything

(   ) 2.A. matter   B. happen   C. appear   D. work

(   ) 3.A. bad   B. terrible   C. ok   D. harmful

(   ) 4.A. By the way   B. Now and then   C. In my opinion   D. At one time

(   ) 5.A. too much   B. a little   C. too often   D. any more

(   ) 6.A. going over   B. taking over   C. coming across   D. making up

(   ) 7.A. give   B. have   C. attend   D. cut

(   ) 8.A. at least   B. at most   C. no more than   D. as little as

(   ) 9.A. once   B. twice   C. again   D. further

(   ) 10.A. used to   B. paid for   C. lost in   D. ready for

(   ) 11.A. Although   B. Even if   C. Now that   D. As long as

(   ) 12.A. the amount   B. the number   C. the deal   D. the kind

(   ) 13.A. broken down   B. cut down   C. turned off   D. cut off

(   ) 14.A. wasting   B. spending   C. making   D. saving

(   ) 15.A. somebody   B. everybody   C. something   D. everything

(   ) 16.A. excites   B. fills   C. repairs   D. destroys

(   ) 17.A. problems   B. pleasure   C. convenience   D. excitements

(   ) 18.A. helpful   B. useful   C. dangerous   D. strange

(   ) 19.A. when   B. after   C. before   D. by

(   ) 20.A. tell   B. explain   C. regret   D. share

10.         water is fundamental to the development of life, (fact)

事实是水是万物进化的基本因素。

9.       why dinosaurs suddenly disappeared. (remain)

恐龙怎么会突然消失仍是个谜。

8.        the sunlight, you can take off your hat. (now that)

乌云挡住太阳了，你就把帽子取下来吧。

7.It is well-known that Chinese football is still not        Brazilian football.

(enough)

众所周知，中国足球还不足以同巴西足球相抗衡。

6.It is reported that there are        as in Wuhan, (as)

据报道，北京的人口是武汉人口的两倍。

5.What people are eager to know is        warmer, (prevent)

人们急切想知道的是怎样阻止地球转暖。

4.       India will become the biggest country in population in the world in- stead of China in the future to come. (appear)

看来在不久的将来印度将取代中国成为世界第一人口大国。

3. Modern science and technology        for China to give birth to the aircraft car- rier, (possible)

现代科技已使中国制造航母(aircraft carrier) 成为可能。