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
2024-07-14
20
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:https://tihaiku.com/zcyy/3676117.html
相关试题推荐
Whydon’tbirdsgetlostontheirlongflightsfromoneplacetoanother?Sc
Whydon’tbirdsgetlostontheirlongflightsfromoneplacetoanother?Sc
Whydon’tbirdsgetlostontheirlongflightsfromoneplacetoanothe
It’sonethingtoworkwellwithothers,butanothertoactuallyenjoy(work)___
WhenevertravelingonShanghaiAirlines(SAL)flightswithpaidtickets,you
Aninsectisnotafraidofgravity,butitisindeadlyfearofanotherforce
Heinsistedonpurchasinganotherhouse,whichhehadnousefor.A、他已经没有什么用处了,但还
Koalas(考拉熊)usearangeofsoundstocommunicatewithoneanother______relativ
Allofuscommunicatewithoneanothernonverbally,aswellaswithwords.Mo
ProfessorLeeissaid______anotherimportantdiscoveryinphysics.A、tomakeB、h
随机试题
[originaltext]WilliamShakespearewaschristenedinthemarkettownofStra
必须依照创办期刊的规定办理审批、登记手续的事项有( )等。A.期刊出版单位变更
BeforetheSpringFestival,theleaderso
洪武八年,朱元璋仿照元朝的办法,印造(),命令民间通行,形成了钱、钞并用的货币
根据税务行政复议的有关规定,下列表述正确的是()。A.税务机关作出的停止出口退
通信管道的作用为()。A.保证光(电)缆的安全可靠 B.确保光(电)缆的传输性
目前应用较广泛的检测焊缝内部缺陷的无损检验方法是()。A、射线探伤 B、超声波
急性肾衰竭多尿期尿量可达 A.400ml/dB.800ml/dC.1
支柱绝缘子选择:
由于发包人的原因使工程未在约定的时间内竣工的,对原约定竣工日期后继续施工的工程进
最新回复
(
0
)