Why don’t birds get lost on their long migratory (遷居的) flights? Scientists have puzzled over this question for many years. Now they’re beginning to fill in the blanks.

Not long ago, experiments showed that birds rely on the sun to guide them during daylight hours. But what about birds that fly mainly by night? Tests with artificial stars have proved conclusively that certain night-flying birds are able to follow the stars in their long-distance flights.

One such bird, a warbler(鳴禽) , had spent its lifetime in a cage and had never flown under a natural sky. Yet it showed an inborn ability to use the stars for guidance. The bird’s cage was placed under an artificial star-filled sky at migration time. The bird tried to fly in the same direction as that taken by his outdoor cousins. Any change in the direction of the make-be-live stars caused a change in the direction of his flight. Scientists think that warblers, when flying in daylight, use the sun for guidance. But the stars are apparently their main means of navigation (導(dǎo)航). What do they do when the stars are hidden by clouds? Apparently, they find their way by such landmarks as mountain ranges, coast lines, and river courses. But when it’s too dark to see these, the warblers circle helplessly, unable to get their direction.

1.The reasons why birds don’t get lost on migratory flights__________.

A．have been known to scientists for many years

B．a(chǎn)re known by everyone

C．have only recently been discovered

D．will probably remain a mystery

2.Warblers migrate__________.

A．from North America to South America

B．using what is apparently an inborn navigational ability

C．only once during their lifetime

D．when they are freed from their cages

3.When the stars are hidden by clouds, warblers find their way by__________ .

A．a(chǎn)n artificial star

B．some landmarks

C．their inborn ability

D．A and B

4.This article is a good example of the way scientists__________ .

A．discover workable answers to universal questions by studying particular cases(特別案例)

B．jump to conclusions

C．find a law and then investigate（調(diào)查）

D．a(chǎn)re disappointed by the habits of animals

 

【答案】

1.C

2.B

3.B

4.A

【解析】鳥兒如何辨別方向？文章給出了答案。

1.推理題。根據(jù)第一段最后一句Now they’re beginning to fill in the blanks.可知很久以來人們都搞不清楚，只是到了最近才弄明白。

2.細節(jié)題。根據(jù)第2段2,3行Yet it showed an inborn ability to use the stars for guidance.

3.細節(jié)題。根據(jù)最后一段倒數(shù)第3行they find their way by such landmarks as mountain ranges。

4.主旨大意題。通讀全文可知文章是關(guān)于用一個特別案例在發(fā)現(xiàn)問題的答案。

 

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