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Why don’t birds get lost on their long migratory(迁移的) flights?  Scientists ____1  over this question for many yearsNow the reasons have been discovered only recently.

    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 proved   5    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 it showed an inborn (天生的)    9   to use the stars for guidance. The bird’s cage was placed under a man-made star-filled sky at migration   10  . The bird tried to fly   11   the same direction as   12   taken by his indoor cousins. Any   13   in the position of the make-believe (虚构的) stars  14   a change in the direction of his 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   by the clouds? Clearly, they find their way by such land.   18    as mountain ranges, coastlines (海岸线) and river courses. But when it’s too   19   to see these, the warblers circle   20  , unable to find out where they were.

1. A. talked               B. puzzled               C. went              D. looked

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. Laboratories              C. Tests              D. Sky

5. A. why              B. how              C. what              D. that

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. removed              D. hidden

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

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

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

 

答案:B;A;B;C;D;A;C;B;B;A;C;A;B;A;B;B;D;C;C;A
提示:

1.     Puzzle over sth. 表示“对某事感到困惑不解”

2.     根据上下文,这里要填的意思为“不久以前”,所以我们选A。

3.     birds depend on the sun to guide them,由于句中出现sun所以,我们知道这里选B。

4.     Test表示“试验”,而其他的单词,如A意思为考试,B意思为实验室,D为天空。

5.     Prove后面接的是宾语从句,用that作关系代词。

6.     上文提到了man-made star所以这里需要填入的是star, 所以选 A.

7.     破折号解释说明前面的单词,a warbler,所以选C,知道是鸟类。

8.     根据上下文知道鸟儿从来没有在自然的天空下飞翔,所以是生活在笼子里。下文也有提示。

9.     从文中我们知道这里只能填B,ability。

10.   At migration time, 表示“在迁徙的时候”的意思。

11.   In the same direction, 表示飞往同样的方向

12.   同级比较的对象,that不能少

13.   根据上下文知道这里填change,下句有提示。

14.   及物动词,cause意思为导致。天空中虚构星星的位置的变化会导致鸟飞行方向的变化。

15.   中间部分做时间状语,用when来引导。

16.   Means这里做方式,手段说。星星是导航的重要方式。

17.   根据常识,是云朵遮住了星星,所以选D。

18.   A,意思为地区,地域,B意思是表面, C,意思为标记,D意思是迹象,路标等。从上下文我们知道C为最佳答案。

19.   从too…to…结构就知道,这里填的是C。

20.   A,意思为无助地,B是有希望地,C是轻松地,D是自由地。所以选A。

 


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