首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
A、To fly one following another. B、To fly without stopping. C、To use land features as the guide. D、To take one route only. CWhat
A、To fly one following another. B、To fly without stopping. C、To use land features as the guide. D、To take one route only. CWhat
admin
2009-04-23
40
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、To fly one following another.
B、To fly without stopping.
C、To use land features as the guide.
D、To take one route only.
答案
C
解析
What is the most straightforward method for the birds to use to find their way?
转载请注明原文地址:https://kaotiyun.com/show/7OR7777K
0
大学英语四级
相关试题推荐
下列不属于金融期货期权的标的资产的是()。
A、Theyaremanagerandassistant.B、Theyarebusinesspartners.C、Theyarecustomerandmanager.D、Theyarecoworkersofthesam
A、Badguysinoldfilms.B、Aperson’slifeproject.C、Religionorpolitics.D、People’sgoalorpurpose.C
A、DifferentexperiencesinEurope.B、Differentsocialandsportorganizations.C、Differentmajorsinyourcollege.D、Differentp
A、GetinvolvedinbothSTEMandliberalarts.B、Majorinwhattheyareinterestedin.C、Learnsomethingthatyourfriendshavel
A、Astrategicnarrativewithdigits.B、Largenumbersandfigures.C、Picturesandphotos.D、Diagramsandcharts.A
A、Allofitsemployeescanspeak3foreignlanguages.B、MostofthetouristsitreceivesspeakSpanish.C、Itwon’thirepeoplew
A、Iftheyareinhighschool.B、Iftheyarementallymature.C、Iftheyaremarried.D、Iftheyareemployed.D讲座最后提到,塞尔维亚允许已有工作的1
A、Peoplewhoareinthehabitofswitchingfromonebanktoanother.B、Youngpeoplewhoarefondofmoderntechnology.C、Youngp
A、Asktheirchildrentodescribeitscharacters.B、Encouragetheirchildrentoretellthestory.C、Checkiftheirchildrenhave
随机试题
在防喷器的型号中,防喷器的通径代号为35,公称通径为356.1mm。
逻辑函数A(BC)写成与或表达式为【】
A.草绿色链球菌B.葡萄球菌C.铜绿假单胞杆菌D.肺炎克雷伯杆菌关于亚急性感染性心内膜炎,最常见的感染细菌是
A.处以罚款B.责令改正C.限期整顿D.应当依法赔偿E.依法追究刑事责任血站违反规定采集血液,给献血者健康造成损害的
《入境货物报检单》上的“货物总值”应与报检时所提供的( )上所列的一致。
甲公司属于增值税一般纳税人,适用的增值税税率为。17%。2014年10月20日,甲公司以一批自产产品和一项专利权与乙公司的一栋办公楼进行交换。甲公司该批自产产品的成本为500万元,未计提存货跌价准备,当日的公允价值(计税价格)为800万元;专利权的原价是4
政府对进出口贸易进行干预的主要手段包括()。
一、注意事项1.本试卷由给定资料与作答要求两部分构成。2.第一题、第二题、第五题,所有考生都必须作答。第三题仅限行政执法类、市(地)以下综合管理类职位的考生作答。第四题仅限考省级(含副省级)以上综合管理类职位的考生作答
Onceuponatimeapoorfarmertakingasackofwheattothemilldidnotknowwhattodowhenitslippedfromhishorseandfel
Itissaidthatthistaxidriverwas______fortheroadaccidentthismorning.
最新回复
(
0
)