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
专升本
Every living thing has an inner biological clock that controls behavior. The clock works all the time; even when there are no ou
Every living thing has an inner biological clock that controls behavior. The clock works all the time; even when there are no ou
admin
2016-03-05
34
问题
Every living thing has an inner biological clock that controls behavior. The clock works all the time; even when there are no outside signs to mark the passing of time. The biological clock tells plants when to form flowers and when the flowers should open. It tells insects when to leave the protective cocoon and fly away. And it tells animals when to eat, sleep and wake. It controls body temperature, the release of some hormones(荷尔蒙)and even dreams. These natural daily events are circadian(生理节奏的)rhythms.
Man has known about them for thousands of years. But the first scientific observation of circadian rhythms was not made until 1729. In that year French astronomer, Jean-Jacques d’Ortous de Mariran, noted that one of his plants opened its leaves at the same time every morning, and closed them at the same time every night. The plant did this even when he kept it in a dark place all the time. Later scientists wondered about circadian rhythms in humans. They learned that man’s biological clock actually keeps time with a day of a little less than 25 hours instead of the 24 hours hours on a man-made clock.
About four years ago, an American doctor, Eliot Weitzman, established a laboratory to study how our biological clock works. The people in his experiments are shut off from the outside world. They are free to listen to and live by their circadian rhythms. Dr. Weitzman hopes his research will lead to effective treatments for common sleep problems and sleep disorders caused by ageing and mental illness. In the first four years of research, Dr. Weitzman and his assistant have observed 16 men between the ages of 21 and 80. The men remained in the laboratory for as long as six months. Dava Sobol became the first woman to take part in the experiment. She entered the laboratory on June 13th and stayed for 25 days. Miss Sobol wrote reports about the experiment during that time, which was published in the newspaper.
In his observation, the French scientist noticed that the leaves of a certain plant maintained its opening-and-closing cycles______ .
选项
A、even when it was kept in a murky(黑暗)place all day
B、even if it was placed in the moonlight
C、even when he was observing it from a dark place
D、even during the night time
答案
A
解析
根据第二段第四行The plant did this even when he kept it in a dark place all thetime.可知,甚至是放在黑暗处的植物也能依靠自己的生物钟来调节张开和闭合叶子的时间,故选择A。
转载请注明原文地址:https://jikaoti.com/ti/pISGFFFM
本试题收录于:
英语题库普高专升本分类
0
英语
普高专升本
相关试题推荐
AIDSstandsforAcquiredImmuneDeficiencySyndrome.Itisestimatedthat0.8to1.2millionpeopleintheUnitedStatesare【B1】
AIDSstandsforAcquiredImmuneDeficiencySyndrome.Itisestimatedthat0.8to1.2millionpeopleintheUnitedStatesare【B1】
Inordertocommunicatethoughtsandfeelings,theremustbeaconventionalsystemofsignsorsymbolswhichmeanthesametoth
What’smoreimportanttoyou,money,acomfortablelife,orself-respect?Manypeoplebelievethatwearelivinginanagewher
Aperson’shomeisasmuchareflectionofhispersonalityastheclotheshewears,thefoodheeatsandthefriendswithwhom
ItishardtoimaginelifewithoutArabicnumbers(数字).Noothernumbersystermeverinventedhasasimplewaytowriteanumber
Americansocietyisnotnap(午睡)friendly.Infact,saysDavidDinges,asleepspecialistattheUniversityofPennsylvaniaSchool
Couldyougivemeahintwithout______theanswer?
Allthestudents______aloudlaughwhentheteachertoldthemthejoke.
Manystudentsfindtheexperienceofattendinguniversitylecturestobeaconfusingandfrustratingexperience.Thelecturersp
随机试题
2016年8月,全国一般公共预算收入9894亿元,同比增长1.7%。其中,中央一般公共预算收入4797亿元。同比增长2.5%,同口径下降2.6%;地方一般公共预算本级收入5097亿元,同比增长1%,同口径增长6.1%。全国一般公共预算收入中的税收收入768
质量活动结果的见证性文件资料是质量记录。()
A.髋关节功能保存B.局部形成窦道C.髋关节骨性强直D.局部形成寒性脓肿E.髋关节形成前屈内收畸形
A.脾肾阳虚B.湿热内蕴C.脾胃气虚D.肝胃不和E.食伤肠胃泄泻腹痛,泻下急迫,或泻而不爽,粪色黄褐,气味臭秽,证属()。
患儿5个月,因多日腹泻使其臀部皮肤潮红,局部清洗后涂药宜选用( )。
水工建筑物按其作用可分为挡水建筑物、泄水建筑物、()。
(2017·广东)教育的功能复杂多样,根据不同的标准,从不同的视角,可以划分为不同的类型。其中,从其作用的对象可分为()
200克的1/10是1千克的多少?
计算下列不定积分:
下列关于构造函数的叙述中,正确的是()。
最新回复
(
0
)