3. The strong light from the mirror could possibly ______.

　 A. hurt fruit crops.　　　　　　　　　 B. set fire to cities.

　 C. bring longer daytime.　　　　　　　 D. shine through walls.

2. The mirror would be used to ______.

　 A. reflect (反射)sunlight.　　　　　　 B. absorb (吸收) sunlight.

　 C. see what the earth looks like.　　　　 D. see how clouds move.

1. The huge mirror would ______.

　 A. stand 60 miles in height (高度).　　　 B. be 60 miles from side to side.

　 C. cover 60 miles of the earth.　　　　 D. be 60 miles above the earth.

82、(1分)

　　 Scientists would like to place a huge mirror in space above the earth. It might be sixty miles wide. It would be used to catch the rays (光线) of the sun. It would direct the sun’s rays upon the earth as a child might do to make sunlight dance on the wall with a hand mirror.

　　 Why do they want to do this? The sun’s rays could be helpful in many ways. They could light up cities by night. The warm rays could stop frosts(霜冻) which might come at might and fruit crops. They could melt (融化) dangerous icebergs in the ocean. Perhaps they could change cloud movements and bring rain where it is needed.

5. Scientists think a fidget habit to be ____ .

　 A. a way to lose fat　　　　　　

　 B. a nervous habit annoying(使讨厌) the people around

　 C. a better exercise than slow running

　 D. a habit of thin people

4. If someone is thin in a pleasant way, we say they are ____ .

　 A. skinny　 B. bony　　 C. slim　　 D. underweight

3. Scientists found in the experiment that ____ .

　 A. the energy burned up by fat people when they fidget was more than that burned up by thin people when they fidget

　 B. some people’s fidgeting burned up more than 800 calories, but some people’s fidgeting burned up less than 100 calories

　 C. slim women fidget more than fat women but fat men fidget more than thin men

　 D. thin men fidget more than fat men

2. We can know from the passage that scientists believe the reason why some people get fat and other people stay slim is that ____ .

　 A. thin people burn up less calories than fat people

　 B. fat people burn up more calories than thin people

　 C. those who burn up more calories than others will be thinner

　 D. those who fidget more than others will be thinner

1. Which of the following can be used to explain the meaning of “fidgeting”?

　 A. scratching and twitching　 B. squirming and wigging

　 C. slow running　 D. moving one’s body nervously

81、(1分)

　　 Have you eaten too much over the holidays? You should try fidgeting for a while. Those around you might not like it, but scratching (moving your nails (指甲) against a part of your body) and twitching (moving suddenly and quickly when you don’ t want to) is an important way of burning up calories (卡路里).

　　 American researchers have found that some people’s squirming (continuously turn your body when nervous) and wigging (move in small movements, especially from side to side) equals (等于) several miles of slow running each day.

　　 The scientists, based at the National Institute of Health’s laboratory in Phenix, Arizona, are studying why some people get fat and other stay slim.

　　 In one study 177 people each spent 24 hours in a room in the institute where the amount (量) of energy is measured by their oxygen and carbon dioxide (二氧化碳) levels. By the end of the day, some people had burned up 800 calories in toe-tapping, (moving the front part of your foot up and down) finger-drumming (hitting your fingers continuously and lightly against something hard) and other nervous habits. However, others had burned up only 100 calories.

　　 The researchers found that slim women fidget more than fat women, but there was no significant difference in men. Heavy people burn up more energy when they fidget than do thin people.