首页
登录
职称英语
Why don’ t birds get lost on their long flights from one place to another? S
Why don’ t birds get lost on their long flights from one place to another? S
游客
2023-10-02
32
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] During daylight hours, birds______.
选项
A、fly aimlessly
B、rely on landmarks
C、rely on the sun for guidance
D、are more likely to get lost
答案
C
解析
题干意为“在白天,鸟儿______。”A项“漫无目的地飞行”;B项“依靠路标”;C项“使用太阳导航”;D项“很有可能迷路”。从文章第二段第一句话“Not long ago,experiments showed that birds use the sun to guide them during daylight hours.”可以判断C为正确答案。
转载请注明原文地址:https://tihaiku.com/zcyy/3063752.html
相关试题推荐
Whydon’tbirdsgetlostontheirlongflightsfromoneplacetoanother?S
Whydon’tbirdsgetlostontheirlongflightsfromoneplacetoanother?S
Thereasonwhybirdsdon’tgetlostonlongflights______.[br]Intotaldarkne
Thereasonwhybirdsdon’tgetlostonlongflights______.[br]Theexperiment
Thereasonwhybirdsdon’tgetlostonlongflights______.[br]By"hisoutdoor
All______toHongKongweredelayedbecauseofbadweather.A、flyB、flightsC、fl
Moneymakesmoney.Toputitanotherway,themoreyouinvest,thegreateryour
NotonlyIbutalsoJaneandMaryaretiredofhavingonemeetingafteranother.
ThereisanothersalethisChristmasseason.Withtheslidingsoundofcash
Canadaislargerthan______countryinAsia.A、anyB、anyotherC、otherD、another
随机试题
[audioFiles]audio_ehbm_j19002(20082)[/audioFiles]A、Waiterandcustomer.B、Patie
[originaltext]M:Whyisitsoimportanttogotocollege?W:(12)Educationiscr
IFBNO.CMC9301308ThePeople’sRepublicofChinaChinaNationalMachineryImpo
表面粗糙值越小,则零件的()A.耐磨性好 B.配合精度高 C.抗疲劳强度差
对劳动争议裁决不服,当事人可以自收到裁决书()内向人民法院提起诉讼。A.10日
《韩熙载夜宴图》的作者是()。A.唐代吴道子 B.南唐顾闳中 C.隋唐展
A.硫糖铝 B.西沙必利 C.雷尼替丁 D.非甾体抗炎药 E.雷贝拉唑作
()对于处分相当于死刑对于()A.撤职刑法 B.开除刑罚 C.
施工企业的工程成本管理,着重围绕工程成本管理体系来进行,这一体系不包括()。A
帽子结构A.m7GpppmG结构 B.mRNA的5′冒子结构 C.多聚A结构
最新回复
(
0
)