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】______ flower
Every living thing has what scientists call a biological clock that controls behavior. It tells plants when to 【C1】______ flower
admin
2010-12-04
45
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】______ .
【C2】
选项
A、walk
B、cry
C、guard
D、awaken
答案
D
解析
语义衔接题。结合空格后的并列动词sleep and seek food,此题可用排除法。生物钟可以告诉人和动物什么时候醒来(awaken),什么时候入睡.以及什么时候寻找食物。
转载请注明原文地址:https://kaotiyun.com/show/ues7777K
0
大学英语六级
相关试题推荐
AlthoughweAmericansinrecentdecadeshavegrownricher,ourchildrenhavegrownpoorer.Manyfamiliesnolongeradequatelype
A、Heforbidshischildrentoeatjunkfood.B、Heandhiswifedon’teatjunkfood.C、Hebelievesbeingavegetarianhelpshimke
A、Before12:45.B、At12:55.C、Atoneo’clock.D、Afteroneo’clock.B
A、Duringeconomicsclass.B、Beforeeconomicsclass.C、Inaboutanhour.D、Thenextday.D选项都和时间有关。从...seemeduringofficehour
A、Philiphasnotbeentothispartofthelibrarybefore.B、Itwasveryquietinthelibrary.C、Philipfellofftheladderandm
Takingyourdogonvacationmayhavebeen【B1】______adecadeago,buttodayit’sflee.【B2】______thepet-friendlyhotel,whe
Theonlysoundsarebirdcallsandthesoftnoise______(当水缓缓推动草时草所发出的).
A、Reasons.B、Advice.C、Leave.D、Opinions.C女士问今天下午可不可以离开几个小时(takeacoupleofhoursoff)。男士询问原因。由此可以推测,女士正在请假。故正确答案为C。
Ironically,intheUnitedStates,acountryofimmigrants,prejudiceanddiscriminationcontinuetobeseriousproblems.Therew
A、Theyshowfear.B、Theystarttocry.C、Theyturntoadults.D、Theyreachouttotouchthem.D短文提到,somebabies害怕陌生的成年人,但他们却会rea
随机试题
在Goldwave软件中,要对选定部分的音频进行“剪裁”操作,状态栏界面如下图所示,剪裁后的音频时长为()。
以下属于化工容器常用低合金钢的是()。
血管栓塞术的效能包括
在碱性溶液中,被铁氰化钾氧化,加正丁醇萃取,醇层显蓝色荧光的是
110kV有效接地系统的配电装置,若地表面的土壤电阻率为500Ω.m,单相接地短路电流持续时间为4s,则配电装置允许的接触电压差和跨步电位差最接近以下哪组数据?
植物羊皮纸()
某期货公司在一起债务纠纷中败诉,标的额为200余万元,胜诉方向人民法院申请强制执行,关于执行问题,下列说法正确的是()。
影响一个公司股票投资价值的内部因素之一是( )。
发扬:作风
【B1】【B10】
最新回复
(
0
)