31、   If you knew a bottle of water had been recycled from urine (尿), would you drink it? Astronauts at the International Space Station (ISS) may soon do so.

   NASA (美国航空航天局) said it would use a high-tech machine (高科技机器) to recycle wastewater at the ISS. The machine will recycle everything from sweat (汗), the water for washing hands, shower water, water used for brushing teeth, and even urine, to make drinking water.

   It will save NASA millions of dollars each year. At present, each ISS astronaut uses about 4.4 liters (升) of water every day. It costs about $24 million a year to transport water up to ISS. NASA says that a liter of water costs about $11,000.

   The machine will be sent to the ISS in October 2008. NASA hopes it will recycle about 93% of all water used on the station.

   Will the water be clean? Scientists say the wastewater will go through a very complicated process (复杂的过程). For example, different chemicals will be put in the wastewater; the water will be heated to 130℃ to get rid of bacteria (细菌). The recycled water is thousands of times better than the water from a city tap, scientists say.

1. NASA will use a high-tech machine to recycle wastewater at the ISS to __________.

   A. protect the ISS

   B. make astronauts at ISS work harder

   C. provide better water and food for ISS astronauts

   D. save the cost of transporting water up to the ISS

2. At present it costs NASA about _________ dollars to transport water up to an astronaut at the ISS a day.

   A. 4.4 thousand              B. 11 thousand     C. 48.4 thousand        D. 24 million

3. Scientists plan to get rid of bacteria in the wastewater by ___________.

   A. freezing           B. heating         C. shaking             D. precipitating (沉淀)

4. The reading mainly tells us something about ___________.

   A. water recycling                          B. the International Space Station

   C. a high-tech machine                  D. the cost of NASA

5. Which of the following sentences is true, according to the passage?

   A. The recycled water is much better than that from a city tap.

   B. The high-tech machine will recycle all the water used on the station.

   C. At present, each ISS astronaut uses more water than the people living on the earth.

   D. The high-tech machine can only recycle urine to make water at present.

29、Have you ever seen a rainbow(彩虹) in the sky? Do you know what it is?

A story says that when you see a rainbow you should   1     at once to the place where it touches（触摸）the ground, and   2    you would find a bag of gold. Of course, it is not   3  . You could not find the bag of gold, nor could you ever find its end. No matter how   4    you run, it always seems far away.

A rainbow is not a thing which we can feel with our   5    as we can feel a flower. It is only the effect (效果) of light shining on raindrops（雨滴）. The raindrops catch the sunlight and break it up into all the wonderful colors which we see.

   It is   6    a rainbow perhaps because it is made up of raindrops and looks like a bow (弓).

That is   7    we can never see a rainbow in a clear   8   . We see rainbows   9    when there is rain in the air and the sun is shining brightly through the clouds. Every rainbow has many colors in the same order. The first of the top color is always red, next    10    orange, then green, and last of all blue. A rainbow is indeed one of the wonders of nature.

1. A. run             B. walk         C. jump            D. stand

2. A. where           B. there          C. here            D. near

3. A. good            B. wrong         C. beautiful         D. true

4. A. long            B. short          C. far              D. difficult

5. A. hands           B. legs           C. heads           D. eyes

6. A. called           B. spoken        C. meant           D. asked

7. A. because         B. why           C. so              D. that

8. A. space           B. sky            C. fields           D. water

9. A. hardly          B. really          C. only             D. usually

10. A. goes           B. sees           C. covers           D. comes

28、– What can I do for you?

– I want _________ MP 4 player for my daughter.

A. a                                    B. an                   C. the            D. 不填

27、– Hello！May I speak to Tina, please?

– Sorry, I’m afraid you have the wrong ____________.

A. name                       B. way              C. number       D. telephone

26、– What else do you want?

– _________ else. I think I have got everything now.

A. Something           B. Everything       C. Nothing          D. Anything

25、– Do you know David?

– Yes. I know him very __________.

A. good               B. well            C. nice             D. fine

24、– Peter, don’t step on the grass.

–  ____________.

A. It doesn’t matter     B. I can’t do it       C. Don’t worry     D. Sorry, I won’t do it again

23、– Would you mind if I sit here?

– ___________. It’s for the old woman there.

A. Never mind                     B. Of course not    C. Not at all          D. You’d better not

22、There are a lot of colorful flowers on ________ sides of the streets.

A. each                        B. both                    C. either                   D. all