首页
登录
职称英语
Why don’ t birds get lost on their long flights from one place to another? S
Why don’ t birds get lost on their long flights from one place to another? S
游客
2024-07-18
6
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
题干意为“鸽子的实验表明 。”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/3682167.html
相关试题推荐
Whydon’tbirdsgetlostontheirlongflightsfromoneplacetoanother?S
Whydon’tbirdsgetlostontheirlongflightsfromoneplacetoanother?S
Whydon’tbirdsgetlostontheirlongflightsfromoneplacetoanother?S
Jacklosthisjobayearagoandhe______anotherjobyet.A、hasfoundB、hasn’tf
Jacklosthisjobayearagoandhe______anotherjobyet.A、hasfoundB、hasn’t
Whydon’tbirdsgetlostontheirlongflightsfromoneplacetoanother?Sc
Whydon’tbirdsgetlostontheirlongflightsfromoneplacetoanother?Sc
Jacklosthisjobayearagoandhe______anotherjobyet.A、hasfoundB、hasn’tf
Jacklosthisjobayearagoandhe______anotherjobyet.A、hasfoundB、hasn’tf
Whydon’tbirdsgetlostontheirlongflightsfromoneplacetoanother?Sc
随机试题
[originaltext]A9-year-oldCentralCaliforniaboybravedstrongcurrentsandco
下列关于流动性风险的说法,不正确的是()。A.流动性风险与信用风险、市场风险和
在足球比赛中,进行有效进攻必须遵循哪些战术原则?()A.纵深、宽度、渗透、延缓
良性肿瘤的临床特点是A:生长快 B:膨胀性生长 C:细胞分化低 D:有转移
对于水泥厂、有机溶剂类化工厂附近的复合外绝缘设备,应加强憎水性检测。
左边给定的是纸盒外表面的展开图,右边哪一项能由它折叠而成?请把它找出来。 A.
根据我国公司法,国有独资公司的监事会由国有资产监督管理机构派出,其目的有()。A
对决策管理层开发的主要内容是()。A.知识和意识、经营技能和领导技能
某建设单位未依法进行环境影响评价即擅自开工建设。根据《中华人民共和国环境保护法》
依据《建设工程消防监督管理规定》,下列人员密集场所建设工程中。应当向公安机关消防
最新回复
(
0
)