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
43
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
Lookatthequestionsforthispart.Youwillhearapassageabout"AmericanWeighsIn".Youwilllistentoittwice.F
Lookatthetenstatementsforthispart.Youwillhearapassageabout"Inflation".Youwilllistentoittwice.Decid
Lookatthetenstatementsforthispart.Youwillhearapassageabout"Inflation".Youwilllistentoittwice.Decid
Youwillhearfivepeopletalkingabout"HowtoSlowDownthePaceofLife".Forquestions9-13,choosefromthelistA~Fw
CONVERSATION2(Questions5-8)Fred’sjob:【L5】______driver.Yearsfordoingthejob:【L6】______.ProblemsFredhad:troublewith
OnhisTVprogramme,Stevelikestoshowaudiences
OnhisTVprogramme,Stevelikestoshowaudiences
Accordingtothepassage,whichofthefollowingstatementsisNOTtruewhenapersonisinastateofdeeprelaxation?Asfar
Eveninahighlymodernizedcountry,manualworkisstillneeded.
随机试题
求微分方程y’+2xy=xe-x2满足y|x=0=1的特解。
社会主义道德建设最根本的是()。
肝阿米巴病多为肠阿米巴的__________,表现为__________、__________。
胃肠道最常见的间叶性肿瘤是
A.甲状腺乳头状癌,滤泡亚型B.甲状腺恶性淋巴瘤C.甲状腺髓样癌D.甲状腺未分化癌E.甲状腺嗜酸细胞癌甲状腺左叶结节样肿物,有包膜,切面呈棕色,有出血、坏死。镜下,瘤细胞较大、多边形,胞质含大量嗜酸性颗粒,瘤细胞异型性明显,瘤组织部分排列成滤泡
某工程项目的招标投标活动中,发现投标人甲以低于成本的报价竞标。这里的成本是指()。
为确保工业炉窑烘干的质量,烘炉必须严格按照()进行。
对应于常用工具栏里“剪切”按钮的快捷键是()。
100000-79999-7999-799-79-7=()。
Jonny:Hey!I’mjustpracticingTaiChi(太极).Wouldyouliketojoinme?Peter:Iknownothingaboutit.Isitdifficult?Jonny:
最新回复
(
0
)