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
2013-11-29
49
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 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-Jacques d’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 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 aging and mental illness. The laboratory is in the Monteflore 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." (In Paragraph 4) probably means ______.
选项
A、They can lead their daily lives according to their biological clocks, without referring to a man-made 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
转载请注明原文地址:https://jikaoti.com/ti/SWOYFFFM
0
考博英语
相关试题推荐
Forlaymenethnologyisprobablythemostinterestingofthebiologicalsciencesfortheveryreasonthatitconcernsanimalsin
Oneofthemajordifferencesbetweenmanandhisclosestlivingrelativeis,ofcourse,thatthechimpanzeehasnotdevelopedth
Oneofthemajordifferencesbetweenmanandhisclosestlivingrelativeis,ofcourse,thatthechimpanzeehasnotdevelopedth
Oneofthemajordifferencesbetweenmanandhisclosestlivingrelativeis,ofcourse,thatthechimpanzeehasnotdevelopedth
Hegradually______thathiswifewasrightandhehadtochangehiswayofliving.
Forlaymenethnologyisthemostinterestingofthebiologicalsciencesfortheveryreasonthatitconcernsanimalsintheirno
Forlaymenethnologyisthemostinterestingofthebiologicalsciencesfortheveryreasonthatitconcernsanimalsintheirno
AndresearcherssaythatlikethoseliteraryromanticsRomeoandJuliet,theymaybeblindtotheconsequencesoftheirquestsf
随机试题
在ISO9000系列标准中,指导企业建立质量体系进行质量管理的标准是
对肠结核的诊断有重要意义的检查方法是
A.肌瘤伴钙化B.浆膜下肌瘤C.粘膜下肌瘤D.肌壁间肌瘤E.宫颈肌瘤
对于体内津液的输布和排泄,维持津液代谢平衡,尤其是对尿液的生成和排泄起着极为重要的调节作用的是()。
A.50元以下罚款B.50元以上罚款C.1000元以上罚款D.1000元以下罚款E.2000元以下罚款有关行政机关对公民可以当场作出行政处罚决定的是()
根据《会计法》的规定,各单位应当设置的会计账簿包括()。
下列会计处理中,正确的有()。
参加中学生运动会团体操比赛的运动员排成了一个正方形队列。如果要使这个正方形队列减少一行和一列,则要减少33人。问参加团体操表演的运动员有多少人?
辆汽车出卖给乙,约定价款30万元。乙先付了20万元,余款在6个月内分期支付。在分期付款期间,甲先将汽车交付给乙,但明确约定付清全款后甲才将汽车的所有权移转给乙。嗣后,甲又将该汽车以20万元的价格卖给不知情的丙,并以指示交付的方式完成交付。下列表述正确的是
AmericanGroupDynamicsToday,inWesternresearchinstitutesanduniversitydepartment,muchworkisdoneasateamprojecta
最新回复
(
0
)