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
36
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] How do most migrating animals travel?
选项
A、They travel together in large numbers.
B、They travel independently.
C、They travel on daytime.
D、They travel with those who have made the journey before.
答案
A
解析
细节题。根据最后一段第一句Most migrating animals travel in groups, sometimes in very large numbers. 可知, 很多迁徙动物是以群体的形式迁徙的, 故选A。
转载请注明原文地址:https://tihaiku.com/zcyy/3658882.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
PassageTwo[br]Whatisthetopicofthispassage?Howactiveforgettingmak
[originaltext]M:Goodmorning,Mrs.Green.Youwanttoseeme?W:Yes,Jim.Let
患者,男,43岁。因外伤住院,皮肤苍白,急诊查血压80/60mmHg,脉搏100
以下是双宾语句的一项是()。A.她羡慕小惠有姣好的容貌 B.我希望你能当班长
已知铆钉的许用切应力为[τ],许用挤压应力为[σbs],钢板的厚度为t,则图示铆
影响黄金价格的因素主要有():A.供求关系及均衡价格 B.通货膨胀
简述陈述行为目标应具备的要素。
常用定量分析方法不包括()。A.平衡表法 B.统计分析方法 C.计量分析方
热觉感受器为( )。A.Meckel环形小体 B.克劳斯终球 C.鲁菲尼小
计算增值税销项税额时,简易计税方法的税前造价指的是()。A.人工费、材料费、
最新回复
(
0
)