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
2024-05-22
9
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’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://tihaiku.com/zcyy/3605629.html
相关试题推荐
[originaltext]Formanyinternationalstudents,comingtotheUnitedStates
Scholarsandstudentshavealwaysbeengreattravelers.Theofficialcasef
Scholarsandstudentshavealwaysbeengreattravelers.Theofficialcasef
Scholarsandstudentshavealwaysbeengreattravelers.Theofficialcasef
Interestinpursuinginternationalcareershassoaredinrecentyears,enha
Interestinpursuinginternationalcareershassoaredinrecentyears,enha
Interestinpursuinginternationalcareershassoaredinrecentyears,enha
Interestinpursuinginternationalcareershassoaredinrecentyears,enha
Interestinpursuinginternationalcareershassoaredinrecentyears,enha
Interestinpursuinginternationalcareershassoaredinrecentyears,enha
随机试题
【S1】[br]【S13】A、otherB、otheroneC、permanentD、betterD形容词辨义。很多人利用临时职位来积攒经验与技能
沥青混合料的技术指标有()。A.高温稳定性 B.耐久性 C.抗滑性 D.
患者,男,58岁。有慢性支气管炎病史20年,已并发肺气肿。今晨因用力大便后突感
某检测中心进行热轧带肋钢筋拉伸的委托检测项目,用户委托的热轧带肋钢筋试样技术参数
证券公司违反《证券公司和证券投资基金管理公司合规管理办法》规定的,对直接负责的董
患者,男,18岁。恶寒发热,头痛身痛,无汗而喘,舌苔薄白,脉浮紧。治疗应首选A.
站用变压器巡视检查项目()A.外观清洁,无漏油、变形,运行时无异常噪声,
下列选项中不适合综合管廊敷设条件的是()。A.不宜开挖路面的地段 B.道路与
老陈是新进入服务机构的社会工作者李星的督导,老陈给李星分配了服务个案,并安排了工
根据2017版红皮书通用条件中关于质量管理的规定,承包商应至少每()进行一
最新回复
(
0
)