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
2010-11-02
29
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】______ .
【C7】
选项
A、days
B、lights
C、times
D、hours
答案
D
解析
逻辑衔接题。通过上下文,我们知道是日光照射的小时数影响了该动物皮毛颜色的变化。因此,选择D。
转载请注明原文地址:https://kaotiyun.com/show/ALs7777K
0
大学英语六级
相关试题推荐
Doyouseetheglassashalf-fullratherthanhalfempty?Doyoukeepyoureyeuponthedoughnut,notuponthehole?Suddenlyth
Doyouseetheglassashalf-fullratherthanhalfempty?Doyoukeepyoureyeuponthedoughnut,notuponthehole?Suddenlyth
Noiseentersourearsaspowerfulwavesofmechanicalenergy.Scientistsmeasuresoundintensityindecibels(db),witheachdou
GMOrganismsByfarthemostcommongeneticallymodified(GM)organismsarecropplants.Butthetechnologyhasnowbeenapp
Agoodwaytogetinformationforessaysandreportsistointerviewpeoplewhoarcexpertsinyour【S1】______topicorwho
Agoodwaytogetinformationforessaysandreportsistointerviewpeoplewhoarcexpertsinyour【S1】______topicorwho
Iamoneofthemanycitypeoplewhoarealwayssayingthatgiventhechoicewewouldprefertoliveinthecountryawayfromth
A、Thelectureswereallboring.B、Notallthelectureswereinteresting.C、Thelectureswereratherinteresting.D、Thelectures
Intheatmosphere,carbondioxideactsratherlikeaone-waymirror—theglassintheroofofagreenhousewhichallowsthesun’s
随机试题
公安政策是由全国人民代表大会提出来的,体现了全国人民的意志。()
远期汇率与即期汇率之间存在差额,当差额用贴水表示时,说明远期汇率__________即期汇率。()
战略重点
与抗胃壁细胞抗体有关的疾病是
SD-SK自下述哪一种细菌
在建设工程中由于指定分包商违约或延误造成的索赔,属于承包商向业主索赔原因中的()。
佛教四大圣地中,佛的成道地是()。
对出版专门以未成年人为对象的()等出版物,国家给予扶持。(2014.湖南)
能否把组织中已建立并正在使用的数据库直接,为新开发的决策支持系统所用?
HowaretheguestsgoingtoNewYork?
最新回复
(
0
)