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
Every living thing has what scientists call a biological clock that controls behavior. It tells plants when to【C1】______ flowers
Every living thing has what scientists call a biological clock that controls behavior. It tells plants when to【C1】______ flowers
admin
2010-10-28
87
问题
Every living thing has what scientists call a biological clock that controls behavior. It tells plants when to【C1】______ flowers and insects when to leave protective cocoon (茧)and fly away. And it tells animals and human beings when to【C2】______ , sleep and seek food. It controls our body temperatures, the【C3】______ of some hormones and even dreams.
Events 【C4】______ the plant and animal affect its actions. Scientists recently found that a tiny animal called Siberian hamster changes the color of its【C5】______ because of the number of hours of【C6】______ In shorter days of winter its fur becomes white. The fur becomes gray-brown in longer【C7】______ of daylight in summer.
【C8】______ signals control other biological clocks. German scientists found that some internal one seems to order birds to begin their【C9】______ flights two times each year. Birds prevented from flying become【C10】______ when it is time for the trip.【C11】______ they become calm again when the time of the flight has ended. A mix of outside and internal events controls some biological clocks; such things as heartbeat and the daily change from sleep to walking take place because of both external and internal signals.
Scientists are beginning to learn【C12】______ parts of the brain contain the biological clocks. A researcher at Harvard University, Dr. Martin Moore Ede, said a small group of cells near the front of the brain seemed to control the【C13】______ of some of our actions. Probably there are other cells to control other body activities. He is studying【C14】______ they affect the way we do our work. Most of us have great difficulty if we【C15】______ often change to different work hours.【C16】______ can take many days for a human body to【C17】______ a major change in work hours. Industrial officials should have a better【C18】______ of biological clocks and how they affect workers. He said such an understanding could【C19】______ sickness and accidents at work, and would help increase【C20】______ .
【C11】
选项
A、And
B、So
C、Then
D、But
答案
D
解析
考查连接词 。由上题我们知道了空格前后两句话是转折关系:当迁徙时间已到,而又被阻止不能迁徙的鸟类很不平静,而当鸟类迁徙结束后它们又恢复了平静。故D项正确。
转载请注明原文地址:https://kaotiyun.com/show/mrz7777K
0
大学英语六级
相关试题推荐
Althoughthefactthattodayvirusesareknownto【S1】______causecancerinanimalsandincertainplants,tha
Althoughthefactthattodayvirusesareknownto【S1】______causecancerinanimalsandincertainplants,tha
Livingisrisky.Crossingtheroad,drivingacar,flying,swallowinganaspirintabletoreatingachickensandwich--theycana
Livingisrisky.Crossingtheroad,drivingacar,flying,swallowinganaspirintabletoreatingachickensandwich--theycana
A、Sheknowsalargerapartmenthecanrent.B、Sheisusedtolivinginalargeapartment.C、Sheknowstheman’sneighborismovi
Weallscreamforwaterwhenthirsty,butdoyouknowinveryhot,dryweather,plantsalsomake【B1】______soundsasiftheya
随机试题
谈论梅子时,引起唾液分泌是()。
Likebusinessandindustry,theacademicworldischangingastechnologyadvances.Librariesareoneplaceweseechanges.Many
A.系膜区及基底膜下有沉积物B.系膜内有沉积物C.基底膜和脏层上皮细胞间有驼峰状沉积物D.基底膜钉状增厚
军团菌病的传播是经
王某在踢球时将一手机遗失,为刘某拾得。刘某将该手机交到当地派出所失物招领处。王某逾期未认领,派出所将该手机拍卖,为赵某购得。后贾某从赵某处将该手机盗走,并以市价在街头卖给善意第三人杜某。现在该手机应归谁所有?()
某笔贷款的利息按年利率6%,每季度复利计息,其贷款的年有效利率为:
下列工业建设项目投资费用中,属于建筑工程费的有()。
财务评价的基本方法包括()。
股权投资基金管理人应当于每年度()月底之前,通过私募基金登记备案系统填报经会计师事务所审计的年度财务报告。
证券公司应当缴纳证券投资者保护基金,对于不从事证券经纪业务的证券公司,应在每年后30个工作日内按该年事先核定的比例预缴;并在审计结束后,确定年度需要缴纳的基金金额并及时向基金公司申报清缴。()
最新回复
(
0
)