首页
登录
职称英语
When animals make long journeys across places where there is no food or shel
When animals make long journeys across places where there is no food or shel
游客
2023-09-24
59
管理
问题
When animals make long journeys across places where there is no food or shelter, such as deserts or oceans, it is very important that they should be able to find their way accurately.
Birds find their way by the stars at night and by the sun during the day. People thought that this was impossible. Then some scientists made an experiment. They put some migrating birds(候鸟)in cages inside a planetarium(天象图). When the operator turned the artificial sky(人造天空)round, the birds began to fly to the sides of the cage. Every time he moved it, the birds moved to a new position. Scientists discovered that they always flew toward the direction in which they would have flown if the sky had been real. This proved that they could see the stars and respond to them.
Many animals, especially birds, have a very precise sense of time, which is called their “internal clock”. In cloudy weather, birds delay setting off on long journeys, but if the cloud lasts for a long time, they must go at last, to complete their migration in time. In such conditions, they are able to steer(引导)by following the magnetic field(磁场)of the earth. We could say that they have their own special compass inside them, which tells the right direction to go.
Most migrating animals travel in groups, sometimes in very large numbers. This makes it more likely that they will find the right way, especially when the group has experienced animals which have made the journey before. [br] When the cloud lasts for a long time. birds are able to ______ .
选项
A、delay setting off on journey
B、guided by the magnetic field of the earth
C、use their “internal clock” to arrive in time
D、tell the right direction by the“internal clock”
答案
B
解析
细节题。根据第三段第三句…they are able to steer by following the magnetic field of the earth. 可知. 当多云的天气持续很长时间后, 候鸟能根据地球磁场来辨别方向, 故选B。
转载请注明原文地址:https://tihaiku.com/zcyy/3042617.html
相关试题推荐
Cuttingupdeadanimalstofindoutabouttheirorgansandhowthesefunctioned
Doyouknowwhydifferentanimalsorpestshavetheirspecialcolors?Colors
Doyouknowwhydifferentanimalsorpestshavetheirspecialcolors?Colors
Doyouknowwhydifferentanimalsorpestshavetheirspecialcolors?Colors
Alltypesofwaterpollutionare(harm)______tothehealthofhumansandanimals
Methodsoftraininganimalshavechangedgreatlyinrecentyears.Zookeeper
Ifwe______moretimeandmoney,wecouldhavevisitedmanymoreplaces.A、have
Cuttingupdeadanimalstofindoutabouttheirorgansandhowthesefunctioned
Birdsarewarm-blooded,vertebrateanimalswhosebodiesarecoveredwithfeat
Birdsarewarm-blooded,vertebrateanimalswhosebodiesarecoveredwithfea
随机试题
EnvironmenthastakenratherabackseatpoliticallysincetheEarthsummiti
PERFECT:STIGMA::A、misleading:deceptionB、paradigmatic:deviationC、solvent:
Mr.Brownislookingforhisglasses.Hethinkshe______thembehindintheoffic
Theclassroomisempty,sothestudents______havegonetothelaboratory.A、ought
Thekeytopleasantmusicmaybethatitpleasesourneurons.Anewmodelsu
超高压输电线路防雷措施最普遍使用的是避雷器。
宫外孕破裂患者,血压70/30mmHg,脉搏125次/分,面色苍白,需急诊手术。
高等学校社会服务的类型和方式主要有()。A.教学性服务 B.科研性服务
综观世界各国成文宪法,结构上一般包括序言、正文和附则三大部分。对此,下列哪一表述
出口产品的生产经营者逃避产品检验或者弄虚作假的,由出入境检验检疫机构和药品监督管
最新回复
(
0
)