首页
登录
职称英语
Every living thing has what scientists call a biological clock that controls
Every living thing has what scientists call a biological clock that controls
游客
2023-09-07
8
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 can 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 biologicaI 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】______ call 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] 【C15】
选项
A、may
B、can
C、must
D、might
答案
C
解析
语义衔接题。情态动词的使用应该参照语境。人们更换工作时间一般是迫不得已而为之,因此只有等到必须做的时候才会更换。所以选C.must,表示“必须”。may“可能,也许”;can“能够,可以”;might(may的过去式)“应该,可能”。
转载请注明原文地址:https://tihaiku.com/zcyy/2993674.html
相关试题推荐
Occasionalself-medicationhasalwaysbeenpartofnormalliving.Themaking
Occasionalself-medicationhasalwaysbeenpartofnormalliving.Themaking
Occasionalself-medicationhasalwaysbeenpartofnormalliving.Themaking
Scientistssaytheyhavehighhopesforadrugthatcouldonedayprovidea
Scientistssaytheyhavehighhopesforadrugthatcouldonedayprovidea
[originaltext](32)Scientistshavediscoveredthatplantsthemselvesproduce
[originaltext](32)Scientistshavediscoveredthatplantsthemselvesproduce
[originaltext]W:Whatdoyoudoforaliving,Frank?M:Iamanaerospaceengin
Scientistssaytheyhavehighhopesforadrugthatcouldonedayprovidean
Scientistssaytheyhavehighhopesforadrugthatcouldonedayprovidean
随机试题
Iwouldrathernotpartwiththepaintingsthan______themtosomeonewhodoesn’t
[originaltext]M:Don’tyouthinkoursonshouldgointomedicine?Healwaysfee
Globalwarmingmayornotbethegreatenvironmentalcrisisofthe21stcent
全面质量管理实施的原则不包括()。A.科学原则 B.预防原则 C.
对
在一国国际收支发生长期性逆差时,贬低本币汇率会:A、刺激出口 B、刺激进口
-√5,5,(),25,-25√5A.-5√5 B.5√5 C
急性化脓性腹膜炎病人术后采取半卧位的目的,哪项是错误的? A.减少毒素吸收
根据《药品管理法》和《药品说明书和标签管理规定》,关于药品注册商标的说法,正确的
(2014年真题)下列地下连续墙的接头形式中,属于刚性接头的是()。A.锁口管
最新回复
(
0
)