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
68
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
Whenthereisavacancyinacompany,itisthejobofthePersonnelManager
[originaltext]Wheredidhislastfewcoinsgo?[/originaltext]A、Helostthem.B、
Ifyoukeepontakingonmoreworkthanyoucando,yourhealthwill_________.A
A.免疫电泳B.免疫固定电泳C.蛋白电泳D.火箭电泳E.对流免疫电泳最大的优势是
市场定位是通过为自己的产品创立鲜明的特色或个性,塑造出独特的市场形象来实现的。下
私人银行业务可以面向所有客户。( )
肝功能:血清碱性磷酸酶(ALP)
(2016年真题)下列会计报表中,反映企业在一定会计期间经营成果的是()A
下列各项中,属于酌量性固定成本的是()。A.固定的设备折旧费 B.车辆交
控制设备安装标高的常用测量仪器是()。A.光学水准仪 B.激光准直仪
最新回复
(
0
)