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
2014-10-11
40
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 blares.
Not long ago, experiments showed that birds rely on the sun to guide them during daylight hours. But what about birds that 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. 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. When the stars are hidden by clouds, they apparently 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.
During daylight hours, birds ______.
选项
A、fly aimlessly
B、rely on landmarks
C、use the sun for guidance
D、are more likely to get lost
答案
C
解析
见第二段第一句:“Not long ago, experiments showed that birds rely on the sun to guide them during daylight hours. ”
转载请注明原文地址:https://kaotiyun.com/show/pwMK777K
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
Howeverimportantwemayregardschoollifetobe,thereisnodenyingthatchildrenspendmoretimeathomethanintheclassroo
BicycletourandraceAbiketourandracewillbeheldonAugust26and27(Sat.&Sun.).At5:30am,theriderswillleav
A、Atthecomerofthestreet.B、Ofcourse.Goahead.C、WefinishedthefifthdialogueoftextA.D、Youleftearlyyesterday.C本题
A、Iheardityesterday.B、Sorrytohearthat.C、Yes.Whatapity!D、Yes,hehad.C本题的问题“你听说迈克的自行车被偷了吗?”是个一般疑问句,应先做“是”或“不是”的回答,且
A——trafficregulationB——safetyislandC——over/overpassD——parkinglotE——licenseplate/numberplateF——emer
A、Motherandson.B、Doctorandpatient.C、Teacherandstudent.D、Husbandandwife.B人物关系题。男士问有什么可以帮忙的吗,女士回答说头痛,体温也高。很明显这是医生和病人之间
SurveysofAmericanteenagersfindthatabouthalfofthemdonotgetenoughsleeponschoolnights.Theygetanaverageofsixt
A、Inapostoffice.B、Inabookstore.C、Inalibrary.D、Inahospital.D对话场景题。对话中男士问女士:“我可以在这里抽烟吗?”女士回答:“抱歉,抽烟对病人们不好。”由此推测,两人很有可
Atpresent,therearemoreandmorewaysofgoingonholiday.Inmyopinion,therearetwotypesofholiday-makersHoliday-m
IfIorderedajacketnow,howlongwouldittakebeforeIgetthedelivery?
随机试题
治疗变异型心绞痛应首选
(2021年诸城)教学活动的本质是()
患者,女,30岁,带下量多色黄,质黏稠,呈泡沫状,有臭气,阴痒,烦躁易怒,口苦咽干,头晕头痛,舌边红,苔黄腻,脉弦滑。其证候是
鼓室内侧壁有()。
缺陷
下列关于乳类蛋白质的描述,不正确的是()。
常见的教学过程组织形式有()。
权力机关、人民政府以及上级公安机关,可以通过检查、审查、调查等监督方式对公安执法行为进行监督。()
国际文献
WhileAmericanshavenoreasontobeterrifiedtositdownatthedinnertable,theyhaveeachreasontodemandsignificantimpr
最新回复
(
0
)