首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
Why don’t birds get lost on their long flights from one place to another? Scientists have puzzled over this question for many ye
Why don’t birds get lost on their long flights from one place to another? Scientists have puzzled over this question for many ye
admin
2015-12-31
54
问题
Why don’t birds get lost on their long flights from one place to another? Scientists have puzzled over this question for many years. Now they’re beginning to fill in the blanks.
Not long ago, experiments showed that birds rely on the sun to guide them during daylight hours. But what about birds that fly by 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 (鸽子) had spent its lifetime in a cage and had never flown under a natural sky. Yet it showed 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 principal means of navigation (航行) only. When the stars are hidden by clouds, they seemingly find their way by such landmarks as mountain ranges, coast lines, and river courses. But when it’s too dark to see these, the doves circle helplessly, unable to find their way.
By "his outdoor cousins" the author means______.
选项
A、other experimenters
B、the other doves of the same brood (n.窝)
C、doves under the natural sky
D、other birds in general
答案
C
解析
文中第三段第四句说:“这只鸽子也像它的outdoor cousins一样朝着一个方向飞。”从第三段中我们得知,这只鸽子是一直生活在笼中且从未在大自然的天空下飞翔过的鸽子。但它同样显示出能以星星作为导航的能力。由此我们可以推断出,与这只鸽子相对比的鸽子一定是在大自然的天空下飞行的鸽子。因此选项C正确。其余三个选项均与文中内容不符。
转载请注明原文地址:https://kaotiyun.com/show/e2PO777K
0
在职攻硕英语联考
相关试题推荐
Globalclimatechange,oftenseenasaprocessstretchingoverthousandsofyears,couldinfactoccurabruptlyandunexpectedly
Woman:Henry,yourarticleinthecampusnewswasexcellent.Man:Ionlywishtheyhadpublishedtheentirething.Question:Wha
______advertisingbringstheeconomiesofmasssellingtothemanufacturer,itproducesbenefitsfortheconsumeraswell.
SpeakerA:Aren’tyouexcitedaboutyournewjob?SpeakerB:______butit’stoodemanding.
Itisdifficulttoimaginewhatlifewouldbelikewithoutmemory.Themeaningsofthousandsofeverydayperceptions,thebases【
Conventionalwisdomhasitthatconcernfortheenvironmentisaluxuryonlytherichworldcanafford;thatonlypeoplewhoseb
TheChinesehaveusedamethodcalledacupuncture(针灸)toperformoperationsforabout4,000yearswithoutputtingthepatientt
Aristotle,theGreekphilosopher,summedupthefourbriefqualitiesofmoneysome2000yearsago.Itmustbelastingandeasy
Aristotle,theGreekphilosopher,summedupthefourbriefqualitiesofmoneysome2000yearsago.Itmustbelastingandeasy
随机试题
临床常用的腧穴定位方法是
A.前屈B.后屈C.水平位D.前倾E.后倾
急性阑尾炎的体征中最有诊断意义的是
甲乙两人准备设立一个有限责任公司,在公司名称上咨询某律师,该律师的下列说法正确的是:
【2012年第3题】题1~5:某小型企业拟新建检修车间、办公房屋和10/0.4kV车间变电所各一处。变电所设变压器一台,车间用电负荷及有关参数见下表。假定5t吊车的设备功率为40kW,电焊机的等效三相负荷(设备功率)为30kW,变电所低压侧无功补偿容
水利工程保修期从工程()写明的工程完工日起一般不少于一年。
投资型保险产品的最大特点是()。
自2018年5月1日起,下列关于纳税人购进农产品,抵扣进项税额的描述正确的有()。
××市公安局与××市工商局联合行文禁止非法传销活动应使用公告。()
你对有的地方“有钱修庙。无钱修校"的现象怎么看?
最新回复
(
0
)