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
2023-10-01
42
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/3061948.html
相关试题推荐
Whatmakesonepersonmoreintelligentthananother?Whatmakesonepersona
Jacklosthisjobayearagoandhe______anotherjobyet.[originaltext]时态[/ori
Canadaislargerthan______countryinAsia.A、anyB、anyotherC、otherD、another
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
随机试题
HowtoSpeakGoodEnglishI.IntroductionA.Manylearne
Ithinkhewillfinallylearnthatit(pay)______toworkhonestly.pays
Humansstillholdontotheabsurd______thatwearetheonlyintelligentbeing
Australianresearchershavediscoveredelectroreceptors(sensoryorgansdesig
Refrigeration,railways,suburbangrowthandthecarhavegivenriseto
A(11)physician,whowaslyingonhisdeathbed,wassurroundedbyseveral
重要房屋的结构设计安全等级应为()级。A、一 B、二 C、三 D、四
“模棱两不可”是违反普通逻辑基本规律排中律要求所犯的逻辑错误。排中律要求,在同一
采用马尔科夫分析方法预测企业内部人力资源供给的关键是( )。A.确定具体岗位的
ABC会计师事务所的A注册会计师负责审计多家上市公司2020年度财务报
最新回复
(
0
)