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
专升本
(81)Why don’ t birds get lost on their long flights from one place to another? Scientists have puzzled over this question for a
(81)Why don’ t birds get lost on their long flights from one place to another? Scientists have puzzled over this question for a
admin
2015-06-21
62
问题
(81)
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
第二段第一句话:不久以前的试验表明鸟类在白天依靠太阳来指引方向。因此可以得出C项是正确答案。
转载请注明原文地址:https://kaotiyun.com/show/01TC777K
本试题收录于:
英语题库普高专升本分类
0
英语
普高专升本
相关试题推荐
ThetoothhadbeentroublingDavidforsometime.Heknewheshouldhavegonetothedentist’s【36】.Butnotcaringaboutthepai
OnOct.12,1989,someChinesescientistswereworkingatthecomputerstolookfortheinformationtheyneeded.Suddenlytheys
Color-blindpeopleoftenfinditdifficultto______betweenblueandgreen.
Friendsplayanimportantpartinourdailylives,andalthoughwemaytakefriendshipforgranted,weoftendon’tclearlyunder
Ifyouwanttostayyoung,sitdownandhaveagoodthink.ThisistheresearchresultofProfessorFaulkner,whosaysthatmost
Doyouknowhowtouseamobilephonewithoutbeingrudetothepeoplearoundyou?Talkingduringaperformanceirritates(激怒
MissEvans【C1】______physicsinaLondonschool.Lastmonthshewasexplainingtooneofher【C2】______aboutsound,andshedecide
A、Becausethenewapartmentisclosetothecollege.B、Becausethepresentapartmentistooexpensive.C、Becauseshelikestoli
Whenyouwerelookingforareliable,honestautomechanic,howdidyoufindhim?Beforeyouwentintothatrestaurantyourecen
Havedinnerwithus,______?
随机试题
流行性脑脊髓膜炎的病变最明显的部位是
(2016年)下列不属于系统误差来源的是()。
某电动车生产企业为增值税一般纳税人。2017年企业自行核算的会计利润总额11696万元,已预缴企业所得税1500万元。2018年1月,经委托的税务师审核,发现以下业务:(1)企业2017年年初房产原值12300万元,其中幼儿园房产原值30
资产负债表中“预付款项”项目应当根据预付账款的总账余额减对应的坏账准备科目期末余额后的净额填列。()
作为n一6系列脂肪酸的前体可转变成γ-亚麻酸、花生四烯酸的必需脂肪酸是()。
著名的“白板说”的倡导者是()。
根据以下资料。回答106-110题。1952年,我国国内生产总值(GDP)仅为300亿美元。1960年,达到614亿美元。之后,每年的GDP总量呈稳步小幅上升态势。1972年突破1000亿美元,之后用了10年的时间达到2021亿美元(1982年)。
传统的解决问题的方法强调以往的经验和知识,而现代的解决问题的方法则强调从达到目标的所有可能途径中选择出最佳的一种,二者均不能成功地解决所有的问题,但二者的结合却往往能解决一种方法难以解决的问题,因此( )。
所谓“人们自己的社会行动的规律”是指
Ajobapplicanthastheresponsibilityforascertainingcertaintypesofinformationpriortotheinterview.First,theapplican
最新回复
(
0
)