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
32
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、large
B、mountain
C、mount
D、important
答案
B
解析
mountain ranges固定词组。
转载请注明原文地址:https://tihaiku.com/zcyy/3662839.html
相关试题推荐
[originaltext]W:Mr.Long,canyoutransfermetoanotherdepartment?M:Why?G
[originaltext]W:Mr.Long,canyoutransfermetoanotherdepartment?M:Why?G
Faces,likefingerprints,arenotthesameasoneanother.Didyoueverwond
Heinsistedonpurchasinganotherhouse,whichhehadnousefor.A、他坚持要再买一套住房,尽管
[originaltext]W:Wedoneedanotherbookshelfinthisroom,buttheproblemis
Birdsdon’tgetlostontheirmigratoryflights,andthereasons______.[br]Wa
AfterI______theworkofthedepartment,Iwastransferredtoanotherone.A、le
IgotaletterfromCanadathismorning,______thatthey’reexpectinganotherd
Theletterpassedfromonetoanotheruntileveryone______(read)it.hadread句意:
Wedemandedthatanothertest______.A、makeB、bemadeC、weremadeD、wouldbemad
随机试题
Never______seensomanypeoplecooperatinginsuchanevent.A、istheworldB、h
[originaltext]M:I’vebeenwaitinghereintheconferenceroomfortenminutes
HAZOP的内容有( )。A.确认所有导致问题的偏差的原因 B.在考虑现存的安
当混凝土结构或构件上的裂缝具有一个可测试面时,预估裂缝深度小于或等于(),可采
对从事传染病预防、医疗、科研的人员以及现场处理疫情的人员,为了保障其健康,他们所
下列不需要检查水分的为A.糊丸 B.蜡丸 C.水丸 D.蜜丸 E
无菌操作是指A.清除或杀灭外环境中的病原微生物及其他有害微生物B.清除或杀灭物体
我国《证券资金基金法》规定,有()情形之一的,基金托管人的职责终止A:基金合同约
投资项目决策分析与评价的基本要求包括贯彻落实科学发展观、资料数据准确可靠和()
《建设项目环境风险评价技术导则》不适用于()的环境影响评价。A.某煤气化生产项目
最新回复
(
0
)