首页
登录
职称英语
Every living thing has what scientists call a biological clock that control
Every living thing has what scientists call a biological clock that control
游客
2023-09-08
59
管理
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】______ . [br] 【C5】
选项
A、skin
B、feather
C、peel
D、fur
答案
D
解析
名词辨析题。通过上下文判断,是动物的皮毛发生了变色。fur表示“皮毛,兽皮”。
转载请注明原文地址:http://tihaiku.com/zcyy/2995897.html
相关试题推荐
PassageOneAliceWalkermakesherlivingbywriting,andherpoems,sho
PassageOneAliceWalkermakesherlivingbywriting,andherpoems,sho
PassageOneAliceWalkermakesherlivingbywriting,andherpoems,sho
PassageOneAliceWalkermakesherlivingbywriting,andherpoems,sho
PassageOneAliceWalkermakesherlivingbywriting,andherpoems,sho
PassageOneAliceWalkermakesherlivingbywriting,andherpoems,sho
Noiseentersourearsaspowerfulwavesofmechanicalenergy.Scientistsmea
______(即使计算是正确的),scientistscanneverbesurethattheyhaveincludedallvar
[originaltext]ThelivingconditionsforthepoorandforimmigrantsinNew
Scientistsestimate______(还要过很多年这种药才能用在人身上).itwillbemanyyearsbeforethe
随机试题
Intechnologymarkets,playingcatch-upisabruising,costlyandoften【B1】_
Whenwasthelasttimeyousawafrog?Chancesare,ifyouliveinacity,y
Thefuturelooksbrightfortheinternationalsupermarketchainbasedi
ManypeoplebelievethatAmericanslove
国内生产某台非标准设备需材料费20万元,加工费2万元,专用工具费率为
有关生物碱的描述正确的除外A:自然界一类含氮有机物 B:氮原子一般在环内 C
B
认知因素致病的原因不包括()。 (A)对逻辑的推理出现失误(B)对事物的
金属材料中,温室密度最低的是()。A.纯镁 B.铅 C.铜 D.铁
女性,42岁,咳嗽,胸闷,气短4个月,胸片左肺上叶前段反复出现片状阴影,白细胞1
最新回复
(
0
)