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 a long
Why don’ t birds get lost on their long flights from one place to another? Scientists have puzzled over this question for a long
admin
2015-01-10
33
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.
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://kaotiyun.com/show/3o0K777K
本试题收录于:
大学英语三级B级题库大学英语三级分类
0
大学英语三级B级
大学英语三级
相关试题推荐
AdvertisementAGroupProductManagerThisisarareopportunitytoworkataseniorlevelforamarketleaderinthefoodindu
Ihopeyouhavebeenabletoreviewtheinformationfornewprograms(seethelastemailIsentyou).Ifyouhaveanyquestions,
From:ChiefAccountantDate:5October,2004To:ManagingDirectorRef:MA/501/ACSubject:Ed
WhatkindofthecourseisE244?Thepurposeofthiscourseistomakethestudents______.
Peoplefaint(晕)whenthenormalbloodsupplytothebrainissuddenlycutdown.Thiscanhappeniftheyaresurprisedorshocke
Thereismuchdiscussionaboutwhetherpresenteconomicgrowthisdesirable.
Ithasbeen______yearssinceGalileomadethefirsttelescope.Withthehelpoftelescopes,scientistscan______.
A、Themangotacold.B、ThemanwouldratherwatchthegameonTV.C、Themanwouldliketogowiththewoman.D、Themandoesn’t
Inordertosearchfortheescapedprisoner,thepolicemandecidedtoquestion______comesalongthisroad.
Hesuddenlyreturned______arainynight.
随机试题
除有关节肿痛伴晨僵外,对类风湿关节炎诊断最有意义的表现是
对监理机构落实监理单位规章制度的考核主要通过与现场监理人员()的形式,了解其对监理单位有关规章制度的熟悉掌握程度,以及通过检查相关记录、监理日志等,验证其对监理单位规章制度的贯彻、执行情况。
允许一部分地区、一部分人通过辛勤劳动和合法经营先富起来。是社会主义的本质要求。
请结合漫画,谈谈你的看法。
某保健医院进行了为期10周的减肥试验。结果显示,参加者平均减肥9kg。其中,男性参加者平均减肥13kg,女性参加者平均减肥7kg。如果以上陈述是真的,并且其中的统计数据是精确的,则以下哪项也一定是真的?
公安局副局长甲收受犯罪嫌疑人家属10万元现金,允诺释放犯罪嫌疑人,因为局长不同意未成。甲的行为()
Cultureisthesumtotalofallthetraditions,customs,beliefs,andwaysoflifeofagivengroupofhumanbeings.Inthis(1)
IndependentWritingDirectionsForthistask,youwillwriteanessayinresponsetoaquestionthatasksyoutostate,expl
A、Theywillremainstable.B、Theywillberaised.C、Theyhavebeenchangingallthetime.D、Theyaredetermineddirectlybythe
Forthispart,youareallowed30minutestowriteashortessayaboutsomethingthathastaughtyoualesson.Youshouldstate
最新回复
(
0
)