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
2023-09-06
34
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 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. [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
由题干中的Going to bed earlier和body’s internal 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 wakeful hours)。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://tihaiku.com/zcyy/2989812.html
相关试题推荐
[originaltext]Formanyinternationalstudents,comingtotheUnitedStates
[originaltext]Formanyinternationalstudents,comingtotheUnitedStates
Scholarsandstudentshavealwaysbeengreattravelers.Theofficialcasef
Scholarsandstudentshavealwaysbeengreattravelers.Theofficialcasef
Scholarsandstudentshavealwaysbeengreattravelers.Theofficialcasef
Scholarsandstudentshavealwaysbeengreattravelers.Theofficialcasef
Interestinpursuinginternationalcareershassoaredinrecentyears,enha
Interestinpursuinginternationalcareershassoaredinrecentyears,enha
Interestinpursuinginternationalcareershassoaredinrecentyears,enha
Interestinpursuinginternationalcareershassoaredinrecentyears,enha
随机试题
[originaltext]Goodafternoon,everybody,todayIamgoingtotellyousome
Australiais【21】driestcontinentinthisworld.Theevaporationrateofrain
在关系代数运算中,关系S、SP和R如下表所示。(),可以从S和SP获得R。其
下列哪项是目前外科患者中最常见、最严重的营养问题( )。A.PAL B.PL
A.天王补心丹 B.益胃汤 C.养心汤 D.四物汤 E.沙参麦冬汤虚劳心
甘草的适应证不包括A.痰多咳嗽气喘B.疮毒C.痰少咳嗽D.心气不足E.四肢挛痛
万用表使用完毕后,应使转换开关在交流电压最大档位或空挡上
中国共产党在领导人民革命的过程,积累了丰富的经验,营造出了有效的克敌制胜的武器,
如果不起雾,飞机将按时起飞,飞机没有按时起飞一定是起雾了。 下列哪个选项与题干
混凝土结构中,模板工程设计的安全性原则是指模板具有足够的()。A.强度
最新回复
(
0
)