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
2024-07-15
4
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/3678209.html
相关试题推荐
Qantas(广达斯航空公司)hasmoreflightstomoreplacesthananyotherAustralianair-l
Jacklosthisjobayearagoandhe______anotherjobyet.[originaltext]时态[/ori
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’tf
Jacklosthisjobayearagoandhe______anotherjobyet.A、hasfoundB、hasn’t
随机试题
[originaltext]Q:Mr.Chen(Yu-Lun),whatkindofamagazineTheWorldofEnglis
ComparedwiththefirstannulpollconductedbytheNationalSleepFoundation,2
属于“母病及子”的脏病传变是( )。A.心病及脾 B.心病及肾 C.心病及
患者男性,70岁。患脑血栓致偏瘫。入院后发现其骶尾部有一4cm×4cm大小的呈紫
辅助设施防误闭锁装置设施:变电站防误操作系统的设计应本着()的原则进行设计和建设
经济发展比经济增长具有更广的外延,它不仅包括经济增长,还包括伴随着经济增长过程而
下列哪项不是影响城市空间发展方向的因素?( )。A.地形地貌 B.经济规模
公安机关群众工作的任务,包括以下几个方面( )A.广泛深入地做好对群众的宣传、
商业银行应有能力对信息系统进行(),制定制度和流程,管理信息科技项目的优先排序
下列有关市净率的修正方法表述不正确的有()。A.用增长率修正实际的市净率,把增
最新回复
(
0
)