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 an inner biological clock that controls behavior. The clock works all the time even when there are no out
Every living thing has an inner biological clock that controls behavior. The clock works all the time even when there are no out
admin
2012-06-18
41
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 insect 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 and even dreams. These natural daily events are circadian 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-Jacquesd"Ortous de Mairan", 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 on a man-made clock. About four years a-go 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 aging and mental illness. The laboratory is in the Monte-flore Hospital in New York City. It has two living areas with three small rooms in each. The windows are covered,so no sunlight or moonlight comes in. There are no radios or television receivers. There is a control room between the living areas. It contains computers,one-way cameras and other electronic devices for observing the person in the living area. The instruments measure heartbeat,body temperature,hormones in the blood,other substances in the urine and brain waves during sleep. A doctor or medical technician is on duty in the control room 24 hours a day during an experiment. They do not work the same time each day and are not permitted to wear watches,so the person in the laboratory has no idea what time it is. 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. Last month,a science reporter for The New York Times newspaper,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 were published in the newspaper.
The sentence "They are free to listen to and live by their circadian rhythms. "(Para. 2) probably means_____.
选项
A、They can lead their daily lives according to their biological clocks,without referring to a manmade clock
B、They can listen to the wonderful rhythms of the biological clock and live close to them
C、They can live by regulating their own circadian rhythms
D、They are free from the annoying rhythms of everyday life
答案
A
解析
词义题。第二段第六句话说“They learned that man’s biological clock actually keeps time with aday of a little less than 25 hours instead of the 24 hours on a man—made clock.an American doctor established a laboratory to study how our biological clock works.The people in his experiments areshut off from the outside world.They are free to listen to and live by their circadian rhythms.”这说明,人类可以根据自身的生物钟活动,无需根据人造钟。这与A符合。
转载请注明原文地址:https://jikaoti.com/ti/G9bYFFFM
0
考博英语
相关试题推荐
Theplaywrightwasknownnotforhisoriginalideasbutforhis______ofideasthathadbeenpropoundedbyothers.
Scientistsgenerallyholdthatlanguagehasbeensolonginusethatthelengthoftimewritingisknowntocoveris______inco
Oneoftheimportantpropertiesofascientifictheoryisitsabilityto______furtherresearchandfurtherthinkingaboutapa
Thepolicywastechnologytransfer,embodiedintheinnovationchainwithitsthreegreatlinks—invention,innovation,and______
Intheirworldofdarkness,itwouldseemlikelythatsomeoftheanimalsmighthavebecomeblind,ashashappenedtosomecave
OneoftheyoungestindependentcountriesintheWesternHemisphere,TrinidadandTobago,becameanationonAugust31,1962.Fo
Althoughoftenextremelycriticalofthemedicalprofessionasawhole,peoplearerarelywillingtotreattheirpersonaldoctor
Theteacher______fromhercustomandgaveusnohomeworkyesterday.
Wheneverwecometostaywiththem,wejustlivelikefightingcocks.
Histhoughtswere________fromthepainfultopicbythesuddenarrivalofaclosefriend.
随机试题
荔枝核的功效是
消化性溃疡的发生和发展与下列哪些因素有关()。
常见的癫痫持续状态系指
下列有关注射剂原辅料的质量要求的叙述中不正确的是()
星星歌舞厅,2009年1月份门票收入40000元,台位收入20000元,相关烟、酒、饮料收入20000元,零点小食品8000元,则该歌舞厅1月份应纳的营业税为()元。
该商场1995年销售额最高的月份是()。该商场月销售额突破千万元大关是在几月份?()
下列关于行政复议案件可否适用调解的说法,正确的是()。
中国革命走农村包围城市、武装夺取政权的道路,是由中国的特殊国情决定的。党之所以能够深入农村积蓄革命力量,建设农村革命根据地,最终实现农村包围城市并夺取政权,是因为
The______withyouisthatyouare______complaining.
UniversitiesBranchOutA)Asneverbeforeintheirlonghistory,universitieshavebecomeinstrumentsofnationalcompetitio
最新回复
(
0
)