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
2024-05-28
21
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/3609936.html
相关试题推荐
Thescientistshaveworkedout______.(一种可以大规模提高农业生产的方法)amethodbywhichthe
Occasionalself-medicationhasalwaysbeenpartofnormalliving.Themaking
Occasionalself-medicationhasalwaysbeenpartofnormalliving.Themaking
Scientistssaytheyhavehighhopesforadrugthatcouldonedayprovidean
Scientistssaytheyhavehighhopesforadrugthatcouldonedayprovidean
[originaltext]M:Youlikelivinginthecity,don’tyou?W:Oh,Iloveit.It’s
[originaltext]M:Youlikelivinginthecity,don’tyou?W:Oh,Iloveit.It’s
[originaltext]Scientistssaysharkshavelivedintheworld’soceansformi
[originaltext]Scientistssaysharkshavelivedintheworld’soceansformi
ClimateChangeScientistspredictincreasi
随机试题
体育项目sportevent
AndrewCarnegie,knownastheKingofSteel,builtthesteelindustryintheUni
TipsfortheSoloTravelerWhenitcomestotraveling,so
所示结构的超静定次数为( )。 A.0 B.1次 C.2次 D.3次
根据《水泥标准稠度用水量、凝结时间、安定性检验方法》GB/T1346-2011有
A.完成一个波长所需的时间叫 B.超声区分垂直于声束的两个物体的能力叫 C.
不属于小细胞低色素性贫血的是A.海洋性贫血 B.缺乏B或叶酸所导致的贫血 C
患者平素眩晕,耳鸣。突然发生口舌?斜,舌强语謇,半身不遂,但其神志清楚,舌红,脉
某农村集体经济组织人均耕地面积0.2公顷,国家建设征收该农村集体经济组织的耕地面
湖南省长沙市中心某大型商业综合体,该商业综合体于2019年12月投入运行。综合体
最新回复
(
0
)