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
A Special Clock Every living thing has what scientists call a biological clock that controls behavior. The biological clock__
A Special Clock Every living thing has what scientists call a biological clock that controls behavior. The biological clock__
admin
2009-06-15
29
问题
A Special Clock
Every living thing has what scientists call a biological clock that controls behavior. The biological clock______(51)plants when to form flowers and when the flowers should open. It tells insects when to______(52)the protective cocoon(防护卵袋)and fly away, and it tells animals and human beings when to eat, sleep and wake.
Events outside the plant and animal______(53)the actions of some biological clocks. Scientists recently found, for example, that a tiny animal changes the color of its fur because of the______(54)of hours of daylight. In the short______(55)of winter, its fur becomes white. The fur becomes gray brown in______(56)in the longer hours of daylight in summer.
Inner signals control other______(57)clocks. German scientists found that some kind of internal clock seems’ to order birds to begin their long migration ______(58)twice each year. Birds______(59)from flying become restless when it is time for the trip,______(60)they become calm again when the time of the flight has ended.
Scientists say they are beginning to learn which______(61)of the brain contain biological clocks. An American researcher, Martin Moorhead, said a small group of cells near the front of the brain______(62)to control the timing of some of our actions. These______(63)tell a person when to wake, when to______(64)and when to seek food. Scientists say there probably are other biological clock Cells that ______(65)other body activities.
选项
A、unless
B、but
C、therefore
D、if
答案
B
解析
转载请注明原文地址:https://kaotiyun.com/show/f5md777K
本试题收录于:
职称英语卫生类A级题库职称英语分类
0
职称英语卫生类A级
职称英语
相关试题推荐
Lookatthequestionsforthispart.Youwillhearapassageabout"HealthandFitness".Youwilllistentoittwice.F
CONVERSATION2(Questions5-8)MESSAGEProblem:Therewasa【L5】______problem.Mr.Franks’companyha
OnhisTVprogramme,Stevelikestoshowaudiences
FRIENDSHIP0Ibelievethatnothingmattersasmuchashavingacoupleofreallygood00friends.Theyhelpyoufeell
Youseethisnoticeonyourschoolnoticeboard.SPECIALPEOPLE•Whoisthemostimportantperso
THOMASEDISONOnthenightof21October1931,millionsofAmericanstookpartinacoast-to-coastceremonytocommemorate
ANUNUSUALSWIMMINGCLUBMembersofaspecialclubinBritaincheerfullyleavethewarmthCHEERoftheirbeds,
Whatisthewritertryingtodointhetext?WhatproblemdoesElizabethhavewithlivinginsuchatallbuilding?
A.OuncesofwaterneededperdayB.ImportanceofwaterC.CompositionofwaterD.SignsofdehydrationE.SupplyofwaterF.Necessi
A.OuncesofwaterneededperdayB.ImportanceofwaterC.CompositionofwaterD.SignsofdehydrationE.SupplyofwaterF.Necessi
随机试题
Thepopulationofourcityisaboutthreetimesaslargeas________oftheirs.
A、末梢神经炎B、听力障碍C、视神经炎D、肝功能损害E、胃肠道不适链霉素的主要不良反应是()
法洛四联征不包括下列哪一种畸形
在会计电算化信息系统的开发与应用中,()是电算化系统的应用阶段。
某甲对A市B区公安分局管辖的一派出所作出的罚款30元的处罚决定不服。若某甲提出行政复议,他应向哪个机关申请?()
从所给的四个选项中,选择最合适的一个填入问号处,使之呈现一定的规律性。
公安机关的督察机构对人民警察的执法活动进行现场督察,这种形式的监督称为事中监督。()
TheXinhuabookstorechain,China’slargestofficialpublishingenterprise,hasbecomeasurprisingflashpointforinterestamo
指令系统是否精简的问题上,产生了两大类计算机系统,它们的英文缩写分别是CISC和_____。
Doctorsbelievethatsecond-handsmokemaycauselungcancerinpeoplewhodonotsmoke.Nonsmokersoftenbreatheinthesmokef
最新回复
(
0
)