第二节 完形填空(共20题，每小题1.5分，共30分)

The amount of usable water has always been of great interest in the world. 　21 　springs and streams sometimes means control, particularly in the 　22　 　areas like the desert. The control is possible even without possession of large areas of 　23　 　land. In the early days of the American West, gun fights were not 　24　 　for the water resources(资源). And laws had to be 　25　 　to protect the water rights of the 　26　 　and the use of the water resources accordingly.

27 　is known to us all, there is not 　28　 water in all places for everyone to use as much as he likes. Deciding on the 　29　 　of water that will be used in any particular period　 　30　 　careful planning, so that people can manage and use water more 　31　 . Farmers have to change their use of or demand for water　 　32　 　the water supply forecast(预报).

The 　33　 　water supply forecast is based more on the water from the 　34　 　than from the below. Interest is 　35　 　in the ways to increase rainfall by man-made methods, and to get water from the winter snow on mountain 　36　 .With special equipment, some scientists are studying the ways in which the mountain snow can be 　　37　 , and with the help of a repeater station, they send the 　　38　 　data to the base station. The operator at base station can get the data at any time by 　　39　 　a button. In the near future, the forecast and use of water 　40　 　probably depend on the advance knowledge of snow on mountains, not of water underground.

20.----Could you spare me a few minutes, M r Smith ?

　 -----__________.

　 A. Not at all　　 B. Of course I do　　 C. With pleasure　　 D. Yes, that’s right

19. -----Do you mind if I turn off the radio-tape recorder?

　 ------_________________. The good news will be on the air in a few minutes.

　 A. I’ m afraid I do　　　　　 B. Of course not

　 C. Why not 　　　　　　　D. Yes, just go ahead

18.One of the reasons_______ he didn’t attend the meeting is ______ his wife is in trouble.

　 A. that ; that　　 B. which ; that　　 C. for which ; what　　 D. why ; that

17. Selecting a mobile phone for personal use is no easy task because technology _____so rapidly.

　 A. has changed　　 B. will have changed　　 C. will change　　 D. is changing

16. Not Mary but her parents _______ on the march for demanding better housing and jobs.

　 A. were　　　　　 B. was　　　　 C. is　　　　 D. will

15. The boy demanded more chocolate from his mother, and finally his mother _______.

　 A. gave up　　　　 B. gave in　　　　 C. gave away　　　　 D. gave off

14. You must have seen him last night, __________ ?

　 A. haven’t you　　　 B. didn’t you　　　 C. don’t you　　　 D. must you

13. She is already two hours late. What _______ to her ?

　 A. can have happened　　　　　 B. may have happened

　 　C. should have happened　　　　 D. must happen