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
2024-07-02
9
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] The phrase “internal clock” means ______ .
选项
A、a clock that is built inside the bird
B、a clock that tells correct time
C、an exact sense of direction
D、an accurate sense of time
答案
D
解析
细节题。根据第_一段第一句Many animals, especially birds, have a very precise sense of time, which is called their “internal clock”. 可知, 很多动物, 尤其是候鸟有一种很精确的时间感和方向感, 故选D。
转载请注明原文地址:https://tihaiku.com/zcyy/3658880.html
相关试题推荐
Someanimals______wellenoughinthatcountry.A、havenotprotectedB、isnotbe
Doyouknowwhydifferentanimalsorpestshavetheirspecialcolors?Colors
Doyouknowwhydifferentanimalsorpestshavetheirspecialcolors?Colors
ThefarmersinChinadon’tuseanimals(do)______farmworkanymore.todo本题考查固
Methodsoftraininganimalshavechangedgreatlyinrecentyears.Zookeeper
Methodsoftraininganimalshavechangedgreatlyinrecentyears.Zookeeper
Methodsoftraininganimalshavechangedgreatlyinrecentyears.Zookeeper
Ifwe______moretimeandmoney,wecouldhavevisitedmanymoreplaces.A、have
Birdsarewarm-blooded,vertebrateanimalswhosebodiesarecoveredwithfeat
Birdsarewarm-blooded,vertebrateanimalswhosebodiesarecoveredwithfea
随机试题
Googlemustbethemostambitiouscompanyintheworld.Itsstatedgoal,"to
Forthispart,youareallowed30minutestowriteanessayentitledTheValueo
Itwasnotmuchfuntotravelononeoftheoldsailingships.Lifewashard
Shewasbornintoapoorfamily,butshewishedthatonedayshewouldhave____
BoxingmatcheswereverypopularinEnglandtwohundredyearsago.Inthose
污泥作为肥料施用时,必须符合下述哪些条件?()A.总氮含量不能太高 B.肥
患者,男,消化性溃疡患者,经常胃出血,近期出现黑粪。估计其出血量为A.3~5ml
下列影响消费者行为的因素中,属于个人因素的是( )。A.学习 B.经济状况
关于认可概念的理解,正确的有()。A.认可都是自愿的 B.认可是由认可机构进
A. B. C. D.
最新回复
(
0
)