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
2024-03-06
18
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/3509468.html
相关试题推荐
[originaltext](23)WiththeInternetrevolutionusheringinnewmodesofco
[originaltext](23)WiththeInternetrevolutionusheringinnewmodesofco
[originaltext]Hereisaquestionforyou.Thecustomerisalwaysright.Rig
[originaltext]Hereisaquestionforyou.Thecustomerisalwaysright.Rig
[originaltext]Moderator:Hello,ladiesandgentlemen.Itgivesmegreat
[originaltext]Moderator:Hello,ladiesandgentlemen.Itgivesmegreat
[originaltext]MedicalexpertssaymostAmericansdonotgetenoughsleep.T
[originaltext]TheWorldHealthOrganizationsays57nationsinSouthernAfr
[originaltext]TheWorldHealthOrganizationsays57nationsinSouthernAfr
[originaltext]W:WhatdoyouthinkofTV?Ithinkitisafalsegod,adang
随机试题
Well,I’dliketobeginbysayinghowpleasedIamthatsomanyofyouhave
AmazinglyfortheBritish,wholovequeues,thereisnoformalline-up—theb
下面关于软件需求分析的叙述,错误的是()。A.需求分析阶段的输入是软件研制任务
在电子商务系统规划阶段,应完成()。A.系统说明书 B.系统设计说明书 C
诊断张力性气胸最确切的根据是A.伤肺呼吸消失 B.伤侧胸部肋间隙增宽 C.呼
雌激素的作用除外A.抑制输卵管蠕动 B.使子宫内膜增生 C.促进水钠排泄
利用( )可以提练企业层面的KPIA.战略地图 B.目标分解鱼骨图 C.任
马克思主义的理论品质是( ) A.解放思想 B.开拓创新 C.与时俱进
(用户名:14;账套:312;操作日期:2014年1月31日)将“转0001号”
三相供电线路如图所示,设电灯D的额定电压为三相电源的相电压,与用电设备M的外壳连
最新回复
(
0
)