首页
登录
职称英语
The curse of jet lag has struck most international travelers at one time or
The curse of jet lag has struck most international travelers at one time or
游客
2024-05-30
4
管理
问题
The curse of jet lag has struck most international travelers at one time or another -- and anyone lucky enough to have avoided it will surely have suffered the equally unpleasant sleep-deprivation involved in an early-morning start. Nor, as shift workers know too, is it possible to escape by going to bed earlier the previous evening, and thus putting sleep in the bank. Sleepiness is controlled by the body’s internal biological clock, so an earlier bedtime just means several wakeful hours staring in frustration at a darkened ceiling.
For years, some travelers and shift workers have sworn by melatonin (褪黑素). This is a hormone that regulates the biological clock. It is made in the brain by a structure called the pineal gland (松果体), as darkness sets in after sunset. Light is the one that keeps the biological clock in same pace with solar time. The clock then tells the brain when to go to sleep. The theory of those who use melatonin is that an external dose of it can reset the clock, and thus cause the "go to sleep" signal to be sent at a more convenient moment. Melatonin can also increase sleepiness during the day, when the pineal gland is not producing it.
This has resulted in a growing, and often unregulated, market in melatonin-supplement tablets. The pharmaceutical industry’s response to this seems to be: "If you can’t beat them, join them." A paper in this week’s Lancet, by Shantha Rajaratnam of the Harvard Medical School and his colleagues, reports two trials, funded by drug companies, of tasimelteon, a substance that binds to the same receptors in the brain as melatonin does, and which it is expected will have a similar effect.
In the course of these trials, more than 400 people had their bedtimes brought forward by five hours in controlled conditions. Half an hour before lights out, a quarter of them were given common drug, while the remaining three-quarters were given varying doses of tasimelteon. Dr. Rajaratnam and his colleagues report that the new drug let people fall asleep faster at the unnaturally early time, and also allowed them to sleep longer than those given the common one. [br] Going to bed earlier, you may be frustrated by body’s internal biological clock in keeping you ______.
选项
答案
wakeful for several hours
解析
空白处应填入keep的宾语补足语,由定位句可知睡眠是由身体内的生物钟控制,早睡只会导致几小时睡不着(several wakeful hours),可知正确答案即为此。
转载请注明原文地址:https://tihaiku.com/zcyy/3612478.html
相关试题推荐
Thecurseofjetlaghasstruckmostinternationaltravelersatonetimeor
Thecurseofjetlaghasstruckmostinternationaltravelersatonetimeor
Thecurseofjetlaghasstruckmostinternationaltravelersatonetimeor
Theincreaseinglobaltrademeansthatinternationalcompaniescannotaffo
Theincreaseinglobaltrademeansthatinternationalcompaniescannotaffo
Theincreaseinglobaltrademeansthatinternationalcompaniescannotaffo
HowtoLovetheWorldAsItIs?Itstruckme
Internationalairlineshaverediscoveredthebusinesstravelers,themanor
Internationalairlineshaverediscoveredthebusinesstravelers,themanor
Internationalairlineshaverediscoveredthebusinesstravelers,themanor
随机试题
[originaltext](22)Skinisthelargestorganofthebody.Itisthebody’s
AnothervirtueAmericansrespectisperseverance.RememberAesop’sfableabou
Thelevelofdiscriminationhasvariedenormouslyinthehistoryofhumanso
(一)资料 2018年3月,某审计组对丙公司2017年度财务收支进行了审计
某商店同时卖出两件商品,每件各得60元,但其中一件赚20%,另一件亏本20%,问
集合资产管理计划管理人承诺以诚实信用、谨慎勤勉的原则管理和运用本集合计划资产,可
根据增值税法律制度的规定,一般纳税人购进货物、服务取得的下列合法凭证中,属于增值
A.口服缓泻剂 B.局部用药 C.挂线疗法 D.瘘管切开术 E.肛裂切除
下列关于人初乳的描述,正确的是( )。A.糖含量最高 B.脂肪含量最少而蛋白
儿童计划免疫预防接种中,初种年龄在8个月以后的疫苗是A.卡介苗 B.脊髓灰质炎
最新回复
(
0
)