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
38
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.
Miss Sobol left the laboratory ______.
选项
A、on June 13th
B、on June 25th
C、at the end of June
D、on July 7th
答案
D
解析
转载请注明原文地址:https://kaotiyun.com/show/FjhO777K
0
考博英语
相关试题推荐
Thejudgeremainedsoberdespitethelawyer’sludicrousattempttoprovethedefendant’sinnocence.
Oneofthemajordifferencesbetweenmanandhisclosestlivingrelativeis,ofcourse,thatthechimpanzeehasnotdevelopedth
Oneofthemajordifferencesbetweenmanandhisclosestlivingrelativeis,ofcourse,thatthechimpanzeehasnotdevelopedth
Oneofthemajordifferencesbetweenmanandhisclosestlivingrelativeis,ofcourse,thatthechimpanzeehasnotdevelopedth
AndresearcherssaythatlikethoseliteraryromanticsRomeoandJuliet,theymaybeblindtotheconsequencesoftheirquestsf
AndresearcherssaythatlikethoseliteraryromanticsRomeoandJuliet,theymaybeblindtotheconsequencesoftheirquestsf
AndresearcherssaythatlikethoseliteraryromanticsRomeoandJuliet,theymaybeblindtotheconsequencesoftheirquestsf
Sincethecouplecouldnot______theirdifferences,theydecidedtogetadivorce.
Fromtheperspectiveofthepoor,itseemsobviousthatthebenefitswouldoutweighthecosts.Thebenefitstopoorpeopleofno
随机试题
下列不属于工程造价计价特征的是:(1级2006年第7题)
6层普通住宅砌体结构无地下室,平面尺寸为9×24m,季节冻土设计冻深0.5m,地下水埋深7.0m,布孔均匀,孔距10.0m,相邻钻孔间基岩面起伏可达7.0m,基岩浅的代表性钻孔资料是:0~3.0m中密中砂,3.0一5.5m为硬塑黏土,以下为薄层泥质灰岩;基
根据水工混凝土施工规范有关规定,混凝土坝坝体浇筑块高度一般在()m以内。
下列关于实质货币的说法正确的是()。
陈式拳式历代相传,至陈式第九代______时,方有自成一家的陈式太极拳问世。其遗留著作______比较系统地介绍了太极拳的练功方法。
“五条禁令”中规定,严禁在工作时间饮酒,违者予以辞退;造成严重后果的,予以开除。()
2011年幸福公式是什么?见仁见智,大学生说:“幸福=理想实现+父母健康”,某省委书记说:“幸福一经济快速稳定增长+百姓生活水平提高+大学生顺利就业。”以上体现的哲学道理是()。
某乒乓球俱乐部决定举办一场所有会员间的循环赛,经俱乐部委员会计算,所需比赛场数刚刚超过2000场,即使省略掉委员会委员们之间的比赛,场数仍有2001场,那么这个乒乓球俱乐部有()个委员。
Oneofthemisconceptionsaboutelitesportisthatgreatathleteshavenothingincommonwithnormalhumanbeings.【C1】______the
FreeSchoolMealsMillionsofAmericanschoolchildrenarereceivingfreeorlow-costmealsforthefirsttimeastheirparen
最新回复
(
0
)