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Why don’t birds get lost on their long migratory (迁移的) flights? Scientists tried their best to find the   1   to this question for many years. The reasons have been discovered only lately.

    2   ago experiments showed that birds depend on the sun to guide them   3   . But what about birds that fly mainly by night?  4   with man-made stars have   5   that certain night-flying birds are able to follow the   6   in their long distance flights.

  One such   7   , a warbler (鸣禽), had spent its lifetime in a   8   and had never flown under a natural sky. Yet is showed its   9   by birth to use the stars for guidance. The bird's cage was put under a man-made star-filled sky at migration   10  . The bird tried to fly   11   the same direction as   12   taken by other birds in the building. Any 13 in the position of the make-believe (虚构的) stars   14   a change in the direction of its flight.

  Scientists think that warblers,  15  flying in daylight, use the sun for guidance. But stars are clearly their important   16   of navigation(导航). What do they do when the stars are   17   behind the clouds? Clearly, they find their way by such land   18   as mountains, coastlines and river courses. But when it's too   19   to see these, the warblers circle  201   , unable to find out where they were.

1. A. reply           B. answer      C. discovery      D. replies

2. A. Not long        B. Long       C. Centuries       D. Years

3. A. during the night                B. during daylight hours

  C. in winter                     D. in the dark

4. A. Examinations    B. Labs       C. Tests           D. In the dark

5. A. been proved     B. found       C. been found      D. proved

6. A. stars           B. moon        C. route          D. sun

7. A. star            B. scientist      C. bird           D. flight

8. A. forest          B. cage         C. nest           D. cave

9. A. strength        B. ability        C. experience     D. practice

10. A. time          B. place         C. way          D. season

11. A. to            B. towards       C. in            D. under

12. A. that          B. which         C. one           D. it

13. A. one          B. change        C. way           D. bird

14. A. caused        B. gave          C. resulted        D. meant

15. A. for           B. when         C. after           D. they are

16. A. ways         B. means         C. objects        D. homes

17. A. shown        B. covered        C. moved         D. hidden

18. A. areas         B. surface         C. marks         D. signs

19. A. far           B. high           C. dark          D. bright

20. A. helplessly     B. quickly         C. easily         D. freely

1-5 BABCD 6-10 ACBBA 11-15 CABAB 16-20 BDCCA


解析:

1.   answer一般指经过思考并有针对性的详细解答;reply仅指一般的答复。

2.   not long ago对应上段结尾的lately。

3.   下文“But...by night”提示此处与之相对而言。上文的sun也暗示了在白天。

4.   通过“测试”证明……

5.   当prove意思是“证明或证实……的结果”时不用被动语态。

6.   见下段中间:“...use the stars for guidance”。

7.   warbler为鸟中的一类。

8.   下文第二句中有提示,本为“笼”中之鸟。

9.   利用星星导航是鸟类天生就有的一种“能力”。

10.   D为可数名词,须有冠词,且与空白前的at搭配不当。

11.   朝……方向,用“in...direction”。

12.   that指代direction,后有?ed形式短语作定语。

13.   此句交代实验中的重要环节,以证实warbler的“ability”。

14.    result要和in搭配。

15.   与后面动词use所表示的动作“同时”。

16.   四个选项词义相比,应选means(手段)。

17.  云“遮”星,cover常与with连用。

18.   空白后as所接三个名词(短语)均属land marks(地面标志)。

19.   空白前it指“天”,选dark。

20.    helplessly与下文unable相呼应。

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