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The world is not hungry，but it’s thirsty. 1 while we say we are short of water.Why？Because about 97% of water on the earth is sea water which we can‘t drink or use for watering plants directly.Man can only drink and use the 3% of water that comes from rivers and lakes. 2 ，because some of it has been polluted.
Now more water is needed.The problem is how we can avoid a serious water shortage in the future. 3 Scientists are making study in this field.Today，In most large cities water is used only once and then runs to the sea or rivers.but it can be used again.Even if every large city reused its water，the water will still not be enough. 4 .
The sea seems to give us the best answer.There is a lot of water in the sea.All that needs to be get the salt out of the sea water.This will be expensive，but it has already been used in many parts of the world. 6 So you see，if we can find out a way，we’ll be in no danger of drying up.
从方框中所给的选项中选出能填入空白处的最佳选项，补全短文。其中有一项为多余选项。
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A．Scientists are trying to find a cheaper way of doing it. |
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B．It seems strange that nearly 3/4 of the earth is covered with water. |
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C．What could people do next? |
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D．We should use all the water directly. |
E. First, we should find out ways to reuse it.
F. And we can’t even use all of that.
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It is very important to stay healthy. I have a neighbor. She is an old lady. She can do all the housework, __41__ newspapers, watch TV and search on the Internet to learn something new. I often see __42__ do taijiquan in the morning and dance in the evening. She looks young and beautiful __43__ she is over seventy. Last week a reporter from a magazine interviewed her and asked __44__ she kept so young and healthy. She replied with a smile:I have a secret of staying young and healthy. It is quite __45__ keep your mind active，take an interest in the world __46__ you, and learn at least one new thing every day. Try to do different kinds of housework and do sports as __47__ you can. Don’t think you are too old to go back to __48__. I know a man who entered a medical college when he was 70 years old. He studied there for 6 years and now he is a doctor. Another man went to a tennis school at the age of 71 and now he is good at __49__ tennis. Some people may say staying young is easy only for those who live in the future. In fact, no matter how old you are, you can make it.
Please tell the story to your family. It would be a good start to __50__ the Lady’s example. I hope all people will stay young and healthy.
41. A. look B. read C. see D. watch
42 A. her B. him C. other D. others
43. A. than B. since C. though D. because
44. A. what B. why C. who D. how
45. A. early B. dear C. easy D. late
46. A. under B. around C. above D. between
47. A. soon B. busily C. hardly D. often
48. A. place B. song C. school D. dance
49. A. buying B. losing C. sending D. playing
50. A. follow B. give C. make D. bring
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