首页
登录
职称英语
Why don’t birds get lost on their long flights from one place to another? Sc
Why don’t birds get lost on their long flights from one place to another? Sc
游客
2023-10-01
16
管理
问题
Why don’t birds get lost on their long flights from one place to another? Scientists have puzzled over this question for a long time. Now they’re starting to fill in the blanks.
Not long ago, experiments showed that birds use the sun to guide them during daylight hours. How do birds fly at night? Tests with artificial stars have proved that certain night-flying birds are able to follow the stars in their long-distance flights.
A dove had spent its lifetime in a cage and had never flown under a natural sky. But it had an inborn ability to use the stars for guidance. The bird’s cage was placed under an artificial star-filled sky. The bird tried to fly in the same direction as that taken by his outdoor cousins. Any change in the position of the artificial stars caused a change in the direction of his flight.
But the stars are apparently their main means of navigation. When the stars are hidden by clouds, they apparently find their way by such landmarks as river courses, mountain ranges, coast lines. But when it’s too dark to see these things, the doves circle helplessly, unable to find their way. [br] By "his outdoor cousins" the author means______.
选项
A、other experimenters
B、the other doves of the same brood
C、doves under the natural sky
D、other birds in general
答案
C
解析
A项“其他实验者”;B项“其他同一窝的鸽子”;C项“在自然天空下飞行的鸽子”; D项“其他鸟类”。根据题意,C为正确答案。
转载请注明原文地址:https://tihaiku.com/zcyy/3061947.html
相关试题推荐
Whatmakesonepersonmoreintelligentthananother?Whatmakesonepersona
Qantas(广达斯航空公司)hasmoreflightstomoreplacesthananyotherAustralianair-l
Canadaislargerthan______countryinAsia.A、anyB、anyotherC、otherD、another
Jacklosthisjobayearagoandhe______anotherjobyet.A、hasfoundB、hasn’tf
Whydon’tbirdsgetlostontheirlongflightsfromoneplacetoanother?Scient
Whydon’tbirdsgetlostontheirlongflightsfromoneplacetoanother?Scient
Whydon’tbirdsgetlostontheirlongflightsfromoneplacetoanother?Scient
Whydon’tbirdsgetlostontheirlongflightsfromoneplacetoanother?S
Whydon’tbirdsgetlostontheirlongflightsfromoneplacetoanother?S
Jacklosthisjobayearagoandhe______anotherjobyet.A、hasfoundB、hasn’t
随机试题
[originaltext]Lifewastough.Lifewasstilltough.(7)Alongtimeago,huma
TheWorldHealthOrganizationsayspeopleneedmoreinformationabouthow
通常在施工索赔中,以下()是不允许索赔的费用。A.人工费、材料费、机械使用费
根据《建设工程安全生产管理条例》规定,出租机械设备和施工机具及配件,应具有(
孕妇,26岁。38周妊娠,下肢水肿近l周,伴头痛12小时,食欲欠佳,无恶心,呕吐
在单元格中求鸡肉四个季度的销售总和,正确的是()。A.SUM(B3:E3) B
房地产经纪机构选择设置存量房业务门店具体区域时,其出发点和根据是()。A:客源
各种运输方式内外部的各个方面的构成和联系,就是( )。 A.运输系统
城市的交通信号机中,()是区域交通信号控制系统,它把整个区域中所有信号交叉口
以下属于投入预算模式典型特征的是()。A.全部预算收支汇集编入一个总预算中
最新回复
(
0
)