首页
登录
职称英语
[originaltext] How do the birds manage to find their way? There seems to be
[originaltext] How do the birds manage to find their way? There seems to be
游客
2023-08-03
47
管理
问题
How do the birds manage to find their way? There seems to be no single answer: they use many methods. Some we are beginning to understand; and there may be some that depend on abilities we have not yet suspected. Many birds certainly follow major geographical features. Migrants follow recognized land, fly over sea and arrive at their summer homes.
But all birds cannot use such straightforward methods. An Arctic sea bird, for example, has to fly at least 3,000 kilometers across the Antarctic Ocean with no land to guide it. We know that some birds flying at night, navigate by the stars for on cloudy nights they tend to get lost.
Day-flying birds may use the sun. If they are to do so, they must have a precise sense of time. Still others appear to be able to use the earth’s magnetic field as a guide. So it seems that many migrating birds must carry in their brains a clock, a compass and the memory of a map.
选项
A、They use a map and the memory of location.
B、They use the sun and the stars.
C、They use a map and the earth’s magnetic field.
D、They have precise sense of time or may use the earth’s magnetic field.
答案
D
解析
How do day-flying birds find their way?
转载请注明原文地址:https://tihaiku.com/zcyy/2893209.html
相关试题推荐
[originaltext]WelcometoLeadershipInsider.[161Itisanonlinecoursetha
[originaltext]WelcometoLeadershipInsider.[161Itisanonlinecoursetha
[originaltext]TelephonebooksintheUnitedStateshavewhite,blueandyel
[originaltext]TelephonebooksintheUnitedStateshavewhite,blueandyel
[originaltext]Theaveragepersonlearnsmostofthe30,000-40,000wordswho
[originaltext]Theaveragepersonlearnsmostofthe30,000-40,000wordswho
[originaltext]Theaveragepersonlearnsmostofthe30,000-40,000wordswho
[originaltext]M:Let’slookatyourproblem.M:youalwaysfailthejobintervi
[originaltext]M:Hi,Wendy.Onlytwomoreweeksofclasses,eightschooldaysa
[originaltext]M:Hi,Wendy.Onlytwomoreweeksofclasses,eightschooldaysa
随机试题
Betweenabout1920to1930,newartisticmovementsinEuropean【M1】______a
Whatisthewomanbusywithrecently?[originaltext]M:Hi!Whatareyouupto?W
[originaltext]AccordingtoanewstudydoneattheMedicalschooloftheUn
Accordingtotheadvertisement,$99istherateofferedfor______.[br]Thepu
基于未被开发这一特征,土地本身的不确定性非常高,因此土地投资可能具有( )。A
“虚则补之,实则泻之”属于A.正治B.反治C.扶正D.因地制宜E.标本兼治
下列各项中,不得在应付职工薪酬核算的有()A.职工教育经费 B.企
共用题干 I'llBeBachComposerDavidCopeis
休克患者的体位应保持在( )。A.中凹位 B.头低足高位 C.侧卧位 D
–10()√3-11A.√2 B.√2-1 C.√3 D.
最新回复
(
0
)