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
68
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、Their memory.
B、The stars.
C、The sense of time.
D、Their experience.
答案
B
解析
How do some birds fly at night?
转载请注明原文地址:https://tihaiku.com/zcyy/2893208.html
相关试题推荐
[originaltext](23)WiththeInternetrevolutionusheringinnewmodesofco
[originaltext](23)WiththeInternetrevolutionusheringinnewmodesofco
[originaltext]Hereisaquestionforyou.Thecustomerisalwaysright.Rig
[originaltext]Moderator:Hello,ladiesandgentlemen.Itgivesmegreat
[originaltext]Moderator:Hello,ladiesandgentlemen.Itgivesmegreat
[originaltext]Moderator:Hello,ladiesandgentlemen.Itgivesmegreat
[originaltext]MedicalexpertssaymostAmericansdonotgetenoughsleep.T
[originaltext]MedicalexpertssaymostAmericansdonotgetenoughsleep.T
[originaltext]TheWorldHealthOrganizationsays57nationsinSouthernAfr
[originaltext]TheWorldHealthOrganizationsays57nationsinSouthernAfr
随机试题
MemorandumTo:JuanGomezFrom:MariaJohnson,BuildingEngineerDate:17Jan.2
Assomeonewhoresearchesgenerationaldifferences,Ifindoneofthemostfr
Wheneveryouseeanoldfilm,evenonemadeaslittleastenyearsbefore,y
Whatdowemeanbybeing’talented’or’gifted’?Themostobviouswayisto
Womenstillhaveanuneasyrelationshipwithpowerandthetraitsnecessaryto
A.qualifiedB.conductedC.reactionsD.privatelyE.responsesF.empl
2017年5月,全球的十几万电脑受到勒索病毒WannaCry的攻击,电脑被感染后
Web2.0指的是一个利用Web的平台,由用户主导生成内容的互联网产品模式。(
护理计划的内容不包括A.护理措施 B.护理记录及评价 C.护理计划 D.护
实际工作年限在10年以下,在本单位工作年限5年以上的医疗期为()。A.3 B
最新回复
(
0
)