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
29
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] 【C11】
选项
A、And
B、So
C、Then
D、But
答案
D
解析
连接词辨析题。由上题我们知道了空格前后两句话是转折关系:当迁徙时间已到,而又被阻止不能迁徙的鸟类很不平静.而当鸟类迁徙结束后它们又恢复了平静,故D正确。
转载请注明原文地址:https://tihaiku.com/zcyy/2993670.html
相关试题推荐
Scientistshavecomeupwithatheoryforwhytimeflieswhenyouarehavin
Scientistshavecomeupwithatheoryforwhytimeflieswhenyouarehavin
Scientistshavecomeupwithatheoryforwhytimeflieswhenyouarehavin
Scientistshavecomeupwithatheoryforwhytimeflieswhenyouarehavin
Scientistshavecomeupwithatheoryforwhytimeflieswhenyouarehavin
Scientistshavecomeupwithatheoryforwhytimeflieswhenyouarehavin
Scientistshavecomeupwithatheoryforwhytimeflieswhenyouarehavin
Scientistshavecomeupwithatheoryforwhytimeflieswhenyouarehavin
Everylivingthinghaswhatscientistscallabiologicalclockthatcontrol
Everylivingthinghaswhatscientistscallabiologicalclockthatcontrol
随机试题
HowtoConquerPublicSpeakingFearI.IntroductionA.Publicspeaking—acom
通讯重于叙述、描写;
特高压交直流混合电网是指在超高压交流电网的基础上采用了()交流和()及以上直流特
抗日战争时期,湘籍作家返回家乡,参加抗战文学建设,他们是()。A.张天翼 B.
高层建筑的给水系统和热水系统必须进行合理的竖向分区并加设()。A.减压设备 B
为胞内寄生菌的肠道杆菌的是A.变形杆菌B.肺炎克雷伯菌C.伤寒沙门菌D.大肠埃希
邱老师是一所普通小学的一名老师。他所管理的班级班风严明、学习成绩突出。他的学生送
交易商协会向接受注册的企业出具《接受注册通知书》,注册有效期为()年。 A
硝酸甘油舒张血管平滑肌的作用机制是A.对血管的直接舒张作用 B.产生一氧化氮,
下列关于堆取料机的安全措施,说法正确的是()。A.两辆堆取料机在同一轨道、同
最新回复
(
0
)