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 (71) lost on their long flights from one place to another? Scientists have puzzled over this (72) for many
Why don’t birds (71) lost on their long flights from one place to another? Scientists have puzzled over this (72) for many
admin
2010-02-05
37
问题
Why don’t birds (71) lost on their long flights from one place to another? Scientists have puzzled over this (72) for many years. Now they are beginning to fill (73) the blanks.
Not long ago, experiments (74) that birds rely on the sun to guide them (75) daylight, hours. But what about birds (76) fly by night? Tests with artificial stars have proved that (77) night - flying birds are able to follow the stars in their long - distance (78) A dove had spent its lifetime in a cage and had never flown under a (79) sky. Yet it showed a(n) (80) ability to use the stars for guidance. The bird’s cage was placed under a (n) (81) star - filled sky. The bird tried to fly in the position as that (82) by his outdoor cousins. Any (83) in the position of the make believe stars caused a change (84) the direction of his flight.
(85) think that doves, when flying in daylight, use the sun for (86) . But the stars are (87) their principal means of navigation. What do they do when the stars are (88) by clouds? Apparently, they find their way by such landmarks as (89) ranges, coast lines, and river courses. But when it’s too dark to see (90) , the doves circle helplessly, unable to get their bearing(方位).
选项
A、change
B、time
C、chance
D、moment
答案
A
解析
转载请注明原文地址:https://kaotiyun.com/show/FblK777K
本试题收录于:
大学英语三级A级题库大学英语三级分类
0
大学英语三级A级
大学英语三级
相关试题推荐
A、HerbestfriendiscomingbackfromtheU.K.B、SheisgoingtotheU.K.withherfriend.C、ShehasanewfriendinAmerica.D、
Hello,everyone.Itisagreatpleasuretohaveyouasassistantstohelp【B1】________theparty.Iamsendingaroundaformfory
Haveyoueverbeenpromoted?Ifso,congratulations.Ifnot,theremightbesomethingyoucandoaboutthat.Togetapromot
Businessmemoisfrequentlyusedincompanies.Itiscalledanintra-companycommunicationbecauseitisusedbypeopleintheir
Thefollowingisapartofthecontentsofacomputerhandbook.Afterreadingit,youarerequiredtofindtheitemsequivalent
Franklyspeaking,I’dratheryou(say)______nothingaboutitforthetimebeing.
Forthoseforeignstudentswhoareinterestedin(learn)______Chinese,theuniversityoffersaChineseprogrameverysummer.
A、Hertapesoftengetstuckinhertapeplayer.B、Shedoesn’tunderstandwhatthemansays.C、Shecan’trepairhertapeplayer.
OneofthegreatestattributesofusingtheInternetisconvenience.TheInternetmakesiteasyforconsumerstogatherinformat
Whetheryou’relookingforaquietplaceoraholidaytrip,Florida’snaturalbeautyandvarioustouristactivitiesletyoumake
随机试题
判断级数的敛散性.若收敛,是绝对收敛还是条件收敛
男性,22岁。反复咽痛伴腰酸、发作性单纯血尿2年余。查体:血压114/72mmHg,咽红,扁桃体Ⅱ度肿大,肾区无叩击痛,下肢无水肿。尿常规:红细胞20~40个/HP,白细胞0~2个/HP,尿蛋白(-),最可能的诊断是
下列哪些提法是正确的?
根据合同实施偏差分析的结果,承包商应该采取相应的调整措施,调整措施可以分为( )。
【背景资料】某安装公司承包一演艺中心的空调工程,演艺中心地处江边(距离江边100m),空调工程设备材料:双工况冷水机组(650Rt)、蓄冰槽、江水热源泵机组、燃气锅炉、低噪声冷却塔(650t/h)、板式热交换机、水泵、空调箱、风机盘管、各类
关于招标信息的修正,下列描述正确的有()。
2015年8月11日,国务院办公厅发布了《关于进一步促进旅游投资和消费的若干意见》,提出要()和加快停车场建设,加强中西部地区旅游支线机场建设,大力推进旅游厕所建设等五项内容。
根据以下资料,回答下列问题。抽样调查数据显示,2014年1—5月A区农村居民人均现金收入9053元,同比增长10.3%,增速较去年同期提高0.4个百分点;其中人均工资性收入为5421元,同比增长8.5%;人均家庭经营收入为760元,同比下降0.6%;人均
【T1】Determinedtomakeitonhisown,Bushdidnottellhisfatherthathewas’applyingtoHarvardBusinessSchool.【T2】The"Wes
Physicistsaren’toftenreprimandedforusingrisquehumorintheiracademicwritings,butin1991thatisexactlywhathappened
最新回复
(
0
)