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
2013-07-30
26
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 the 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 Siberain 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 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 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. It can【C16】______many days for a human body to【C17】______the 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】______.
【C15】
选项
A、can
B、must
C、might
D、may
答案
B
解析
语义衔接题。人们更换工作时间一般是迫不得已而为之,只有[B]must有这层含义,故为答案。
转载请注明原文地址:https://jikaoti.com/ti/UHHFFFFM
0
大学英语六级
相关试题推荐
A、Themanshouldgofortheexchangeprogram.B、ThemanshouldnotgototheU.S.for3months.C、Manypeoplewanttogoforthe
A、Fruit,waterandinsects.B、Plantsandwater.C、Highplantsandfood.D、Plantsandfood.D短文谈到,所有的鸟都需要植物来做巢,也需要食物,人们的院子可以提供这些东
Ifyouthinkwomenstillgainmoreeconomicbenefitthanmendofrommarriage,youmaybelivinginthepast.Today,menarebett
Ifyouthinkwomenstillgainmoreeconomicbenefitthanmendofrommarriage,youmaybelivinginthepast.Today,menarebett
Ifyouthinkwomenstillgainmoreeconomicbenefitthanmendofrommarriage,youmaybelivinginthepast.Today,menarebett
Occasionalself-medicationhasalwaysbeenpartofnormalliving.Themakingandsellingofdrugshasalonghistoryandisclos
Occasionalself-medicationhasalwaysbeenpartofnormalliving.Themakingandsellingofdrugshasalonghistoryandisclos
It’sasimplecalculus,kidsandmoney:Frombirthuntilcollegegraduation,childrenconsumedollarslikethey’rechickennugge
随机试题
初产妇,40周妊娠,规律宫缩18小时,检查:宫口开大6cm,宫缩渐弱,每6~7分钟持续20~30秒,2小时后复查,宫口仍开大6cm,S=1,骨盆外测量正常范围,胎心率每分钟130~135次,规律。首选的处理措施是
案情:A公司、B公司、c公司和伊某、程某共同出资设立了玉泉有限责任公司,其中A公司出资40%,B公司和C公司各出资20%,伊某和程某各出资10%。公司成立后,B公司未征求其他股东的意见,直接将自己10%的股份转让给C公司。伊某拟将自己的股份转让给宋某,书面
影响变压器的电压调整率的所有可能的因素是()。
财政政策的基本功能是()。
下列关于房屋租赁政策,说法不正确的是()。
甲、乙两个工厂的平均技术人员比例为45%,其中甲厂的人数比乙厂多12.5%,技术人员的人数比乙厂的多25%,非技术人员人数比乙厂多6人。甲、乙两个工厂共有多少人?
社会保险是指国家通过立法,多渠道筹集资金,在劳动者暂时或者永久丧失劳动能力以及其他原因中断工作,没有经济收入或者劳动收入减少时,给予经济补助,使他们能够享有基本生活条件的一项社会保障制度。根据以上定义,下列属于社会保险的是()。
急性肾盂肾炎的基本病变是
4
A、Hemakesafoolofhimselfbyeatingtoomuch.B、Helikestoeatsomethingotherthanbeef.C、Hewantstoeatsomemoreroast
最新回复
(
0
)