As mountains beyond our village are becoming greener and greener, they have become home to a large amount of wild life. A. the; / B. the; a C./; a D. the; the 题目和参考答案——青夏教育精英家教网—

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As ____ mountains beyond our village are becoming greener and greener, they have become_________ home to a large amount of wild life.

　 A. the; /　　　 B. the; a　　　 C./; a　　　　 D. the; the

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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

As mountains beyond our village are becoming greener and greener,they have become ome to a large amount of wild life.

A.the;/ B.the;a C./;a D.the;the

As ____ mountains beyond our village are becoming greener and greener, they have become_________ home to a large amount of wild life.

A. the; / B. the; a C./; a D. the; the

As ____ mountains beyond our village are becoming greener and greener, they have become_________ home to a large amount of wild life.

A. the; / B. the; a C./; a D. the; the

As ________ mountains surrounding our village are turning much greener, they have become ________ home to a large number of wild animals.

A. the; / B. the; a C. /; a D. the; the

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