首页
登录
职称英语
Why don’ t birds get lost on their long flights from one place to another? Sc
Why don’ t birds get lost on their long flights from one place to another? Sc
游客
2023-09-30
58
管理
问题
Why don’ t birds get lost on their long flights from one place to another? Scientists have puzzled over this question for a long time. Now they’ re starting to fill in the blanks.
Not long ago, experiments showed that birds use the sun to guide them during daylight hours. How do birds fly at night? Tests with artificial stars have proved that certain night-flying birds are able to follow the stars in their long-distance flights.
A dove had spent its lifetime in a cage and had never flown under a natural sky. But it had an inborn ability to use the stars for guidance. The bird’ s cage was placed under an artificial star-filled sky. The bird tried to fly in the same direction as that taken by his outdoor cousins. Any change in the position of the artificial stars caused a change in the direction of his flight.
But the stars are apparently their main means of navigation. When the stars are hidden by clouds, they apparently find their way by such landmarks as river courses, mountain ranges, coast lines. But when it’ s too dark to see these things, the doves circle helplessly, unable to find their way. [br] The experiment with the dove indicates that______.
选项
A、birds have to be taught to navigate
B、a bird that has been caged will not fly long distances
C、some birds cannot fly at night
D、some birds seem to follow the stars when they fly at night
答案
D
解析
选项A从第三段“But it had an inborn ability to use the stars for guidance.”可以排除。解题关键是从第二段的最后一句话“Tests with artificial stars have proved that certain night-flying birds are able to follow the stars in their long-distance flights.”可排除B、C,并推理出D项为正确答案。
转载请注明原文地址:http://tihaiku.com/zcyy/3059855.html
相关试题推荐
Whydon’tbirdsgetlostontheirlongflightsfromoneplacetoanother?Scient
Whydon’tbirdsgetlostontheirlongflightsfromoneplacetoanother?Scient
Whydon’tbirdsgetlostontheirlongflightsfromoneplacetoanother?Scient
Whydon’tbirdsgetlostontheirlongflightsfromoneplacetoanother?S
Whydon’tbirdsgetlostontheirlongflightsfromoneplacetoanother?S
Jacklosthisjobayearagoandhe______anotherjobyet.A、hasfoundB、hasn’tf
Jacklosthisjobayearagoandhe______anotherjobyet.A、hasfoundB、hasn’t
Whydon’tbirdsgetlostontheirlongflightsfromoneplacetoanother?Sc
Whydon’tbirdsgetlostontheirlongflightsfromoneplacetoanother?Sc
Whydon’tbirdsgetlostontheirlongflightsfromoneplacetoanother?Sc
随机试题
InShanghai,agrowingnumberofforeign-fundedbanksarelookingforlocal
【B1】[br]【B18】A、inB、withC、atD、fromC介词搭配题[考频:7]。at与后面的State-ownedorganizati
ArtistTurnsPlasticBagsintoArtVocabularyandExpressionssculpturebraid
[originaltext]Goodmorning,folks.Today’slectureisaboutthedevelopment
[originaltext]ThisincidentoccurredonemorningoutsideAlbertSchweitzer’sho
五千年前就开始用砖砌筑拱券的地方是( )。A.东欧 B.南非 C.西亚
下列药物中可以解除胃肠平滑肌痉挛的包括()A:颠茄 B:阿托品 C:山莨菪
证券公司与证券经纪人签订委托合同,应当遵循平等自愿、诚实信用的原则,公平地确定双
某单位去年党员人数比入党积极分子人数多4倍,男性党员和入党积极分子均比女性多。今
制定德育目标的主要依据有哪些?
最新回复
(
0
)