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
2024-07-23
6
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/3689764.html
相关试题推荐
Whydon’tbirdsgetlostontheirlongflightsfromoneplacetoanother?S
Whydon’tbirdsgetlostontheirlongflightsfromoneplacetoanother?S
Whydon’tbirdsgetlostontheirlongflightsfromoneplacetoanother?S
Whydon’tbirdsgetlostontheirlongflightsfromoneplacetoanother?S
Thereasonwhybirdsdon’tgetlostonlongflights______.[br]Intotaldarkne
Thereasonwhybirdsdon’tgetlostonlongflights______.[br]Theexperiment
All______toHongKongweredelayedbecauseofbadweather.A、flyB、flightsC、fl
Moneymakesmoney.Toputitanotherway,themoreyouinvest,thegreateryour
NotonlyIbutalsoJaneandMaryaretiredofhavingonemeetingafteranother.
Qantas(广达斯航空公司)hasmoreflightstomoreplacesthananyotherAustralianairli
随机试题
[originaltext]W:I’vejustheardthatI’vegottogotoaconferenceinLondont
在特殊教育学校建筑设计中应充分采用()。A.天然采光和自然通风 B.天然采
圈梁及在同一水平面上封闭的梁,如被门窗洞口截断可不做处理。\t()
患者,女性,35岁。因发热寒战,腰痛5天入院。右肾区有叩击痛。尿常规:红细胞5~
(2021年真题)关于创业投资基金的特点,以下表述正确的是()A.投资存量
投资者的评估结果有效期最长不得超过()年。募集机构逾期再次向投资者推介私募
下列属于高强钢筋的有()。A、Ⅰ级热轧钢筋 B、Ⅱ级热轧钢筋 C、Ⅲ级热轧
避雷针运维细则中,避雷针与接地极应可靠连接,避雷针应采用(____)引下线,接地
近日,曼彻斯特大学的科学家宣布,他们已经可以通过精确控制石墨烯膜中的孔径,从咸水
设A、B、C是三个事件,与事件A互斥的事件是( )。
最新回复
(
0
)