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
54
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"AmericanWeighsIn".Youwilllistentoittwice.F
Lookatthequestionsforthispart.Youwillhearapassageabout"AmericanWeighsIn".Youwilllistentoittwice.F
Lookatthetenstatementsforthispart.Youwillhearapassageabout"WhoFirstStartedtoSmoke?";youwilllistento
Lookatthequestionsforthispart.Youwillhearapassageabout"HealthandFitness".Youwilllistentoittwice.F
CONVERSATION2(Questions5-8)MESSAGEProblem:Therewasa【L5】______problem.Mr.Franks’companyha
FRIENDSHIP0Ibelievethatnothingmattersasmuchashavingacoupleofreallygood00friends.Theyhelpyoufeell
FRIENDSHIP0Ibelievethatnothingmattersasmuchashavingacoupleofreallygood00friends.Theyhelpyoufeell
FRIENDSHIP0Ibelievethatnothingmattersasmuchashavingacoupleofreallygood00friends.Theyhelpyoufeell
ANUNUSUALSWIMMINGCLUBMembersofaspecialclubinBritaincheerfullyleavethewarmthCHEERoftheirbeds,
WhatcanweinferfromthefiguresabouttheAmericanhouseholdsizeinthefirstparagraph?Accordingtotheauthor,themost
随机试题
审美趣味具有明显的________。
精神抑郁,情绪不宁,胸胁胀满疼痛,见于:动而多怒,兴奋性精神失常,见于:
A.抑制蛋白质合成B.刺激胰岛β细胞释放胰岛素C.促进葡萄糖分解.D.抑制糖原分解和异生E.增强胰岛素的作用胰岛素降血糖作用是
焊接钢管和镀锌钢管的最大直径为()mm,管径用公称直径DN表示。
岩石挖方路段不宜选用的挡土墙是()。
教师对学生的积极期待会对学生发展产生积极推动作用,这种现象是()。
税收激励是指政府在税制设计和税收征管过程中,运用多种手段,通过税负的调整,诱导微观经济主体的行为选择,鼓励纳税人发生或不发生、参与或不参与某种经济行为,以实现正府社会经济协调发展的战略目标。根据以上定义,下列不属于税收激励的是( )。
RSA是一种公开密钥加密算法。其原理是:已知素数p、q,计算n=pq,选取加密密钥e,使e与(p-1)×(q-1)互质,计算解密密钥d=e-1mod((p-1)×(q-1))。其中n、e是公开的。如果M、C分别是明文和加密后的密文,则加密的过程可表示为
在关系模型中,把数据看成一个二维表,每一个二维表称为一个______。
在ASCⅡ码表中,根据码值由小到大的排列顺序是()。
最新回复
(
0
)