首页
登录
职称英语
Why don’t birds (71) lost on their long flights from one place to another?
Why don’t birds (71) lost on their long flights from one place to another?
游客
2024-07-04
17
管理
问题
Why don’t birds (71) lost on their long flights from one place to another? Scientists have puzzled over this (72) for many years. Now they are beginning to fill (73) the blanks.
Not long ago, experiments (74) that birds rely on the sun to guide them (75) daylight, hours. But what about birds (76) fly by night? Tests with artificial stars have proved that (77) night - flying birds are able to follow the stars in their long - distance (78) A dove had spent its lifetime in a cage and had never flown under a (79) sky. Yet it showed a(n) (80) ability to use the stars for guidance. The bird’s cage was placed under a (n) (81) star - filled sky. The bird tried to fly in the position as that (82) by his outdoor cousins. Any (83) in the position of the make believe stars caused a change (84) the direction of his flight.
(85) think that doves, when flying in daylight, use the sun for (86) . But the stars are (87) their principal means of navigation. What do they do when the stars are (88) by clouds? Apparently, they find their way by such landmarks as (89) ranges, coast lines, and river courses. But when it’s too dark to see (90) , the doves circle helplessly, unable to get their bearing(方位). [br]
选项
A、in
B、on
C、at
D、during
答案
D
解析
during强调时间的长度、过程。
转载请注明原文地址:https://tihaiku.com/zcyy/3662825.html
相关试题推荐
[originaltext]W:Mr.Long,canyoutransfermetoanotherdepartment?M:Why?G
[originaltext]W:Mr.Long,canyoutransfermetoanotherdepartment?M:Why?G
AnothervirtueAmericansrespectisperseverance.RememberAesop’sfableabou
Inonewayofthinking,failureispartoflife.Inanotherway,failuremay
Faces,likefingerprints,arenotthesameasoneanother.Didyoueverwond
Heinsistedonpurchasinganotherhouse,whichhehadnousefor.A、他坚持要再买一套住房,尽管
Birdsdon’tgetlostontheirmigratoryflights,andthereasons______.[br]Th
AfterI______theworkofthedepartment,Iwastransferredtoanotherone.A、le
Theletterpassedfromonetoanotheruntileveryone______(read)it.hadread句意:
[originaltext]Man:Excuseme.I’dliketofindoutaboutflightstoNewYork.W
随机试题
[originaltext]M:NowI’lltakesomequestions.W:Well,Mr.Brown,Ihaveaque
A.disgracefulB.imperfectC.holdD.considerationE.approvedF.acco
Youshouldspendabout20minutesonQuestions1-13whicharebasedonReadingP
ThePlayofPower:AnIntroductiontoAmericanGovernmentJ
下列不符合前尿道瓣膜及憩室临床表现的是A.排尿困难、尿滴沥 B.膀胱内大量残余
下列关于开展个人贷款业务的意义的说法中,错误的是()。A.帮助银行消除风险
Thechangeinthatvillagewasmiraculou
阿司匹林的水杨酸反应不包括A.耳鸣、耳聋B.呼吸抑制C.头痛、眩晕、晕厥D.酸中
采购部门与其他部门的关系可以大致分成四种类型,不属于这四类关系的为().A.混
目前电站汽轮机低压外下缸组合时气缸找中心的基准通常采用()。A.激光 B
最新回复
(
0
)