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
The curse of jet lag has struck most international travelers at one time or another — and anyone lucky enough to have avoided it
The curse of jet lag has struck most international travelers at one time or another — and anyone lucky enough to have avoided it
admin
2012-02-02
55
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 the 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.
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
由题干中的Going to bed earlier和body’sinternal biological clock,可将本题出处定位到第一段最后一句。该句说,睡眠由身体内的生物钟控制,早睡只会意味着几小时睡不着(several wakefulhours)。题干中的be frustrated对应原文中的in frustration。空白处应填入keep的宾语补足语,意思是“使某人保持某一状态”,将原文中的名词短语转换为形容词短语即为答案。
转载请注明原文地址:https://kaotiyun.com/show/7do7777K
0
大学英语六级
相关试题推荐
A、$9.B、$18.C、$12.D、$36.C综合推断题。男士说这个包18美元,女士说这个价格比两个月前涨了一半,由此可知,现在的价格是两个月前的1.5倍,所以C正确。
BorninNorthCarolinain1862,WilliamSidneyPorter,thismasterofshortstoriesismuchbetterknownunderhispenname"O.
A、Heagreeswiththewoman’schoice.B、Hedoesn’twantspicyfood.C、Hewantsthesaladtobefresh.D、Garlicishisfavoritefl
A、Thevisitingeconomisthasgivenseverallectures.B、Dr.Johnsonandtheguestspeakerwereschoolmates.C、Dr.Johnsoninvited
Manyworkersdependonplans【B1】______bytheiremployerstohelppayfortheirretirement.Therearetwomajorkindsofretirem
Manyworkersdependonplans【B1】______bytheiremployerstohelppayfortheirretirement.Therearetwomajorkindsofretirem
A、Doesnotgreatlyimprove.B、Greatlyimproves.C、Doesnotimprove.D、Isnotasgoodasbefore.A对话中主持人提问:“您认为这是对教育体制的促进吗?”女士说原先
A、Theyaresocialmarineanimals.B、Theycallforhelpwhentheyareindanger.C、Theyhuntfoodaloneandindependently.D、They
A、Hehasadarkerskinnow.B、Hewentsouthtogetsun-tanned.C、Hecouldnotrecognizehismother.D、Heworksinasouthernsta
It’snosecretweareacultureconsumedbyimage.Economistshavelongrecognizedwhat’sbeendubbedthe"beautypremium"—thei
随机试题
潞金融资产管理公司注册资本金为_______。
在我国社会主义市场经济条件下,如何正确运用集权制、分权制和均权制?
下列符合肺淤血的描述是
腹壁切口疝修补手术后第2天,伤口针眼处稍红肿,此时的处理措施是
铁路运输凡在行车工作中,因违反规章制度、违反劳动纪律、或技术设备不良及其他原因,造成人员伤亡、设备损坏,影响行车及危及行车安全的,均构成()。
负责草拟比较重要的财务会计制度、规定、办法;解释、解答财务会计法规、制度中的重要问题;分析检查财务收支和预算的执行情况等,属于()专业职务的基本职责。
一个民族之所以作出这种或那种选择,其特定的原因包括()
,要限制宏命令的操作范围,可以在创建宏时定义()。
InterpretthefollowingpassagefromChineseintoEnglish.Startinterpretingatthesignalandstopatthesignal.Youmaytake
Wildducksandothermigratory(迁移的)birdscouldbeimportantcarriersofdeadlybirdflu,researcherssay.Evenso,theinfecti
最新回复
(
0
)