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
2023-09-08
47
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/2996212.html
相关试题推荐
[originaltext]M:Hello.InternationalFriendsClub.CanIhelpyou?W:Oh,hell
[originaltext]Formanyinternationalstudents,comingtotheUnitedStates
[originaltext]Formanyinternationalstudents,comingtotheUnitedStates
Scholarsandstudentshavealwaysbeengreattravelers.Theofficialcasef
Scholarsandstudentshavealwaysbeengreattravelers.Theofficialcasef
Scholarsandstudentshavealwaysbeengreattravelers.Theofficialcasef
Scholarsandstudentshavealwaysbeengreattravelers.Theofficialcasef
Scholarsandstudentshavealwaysbeengreattravelers.Theofficialcasef
Interestinpursuinginternationalcareershassoaredinrecentyears,enha
Interestinpursuinginternationalcareershassoaredinrecentyears,enha
随机试题
Thepocketcalculatorhasbeenrelegatedtotheroleofagraphiciconondi
邮政部门、电信部门属于()A.信息存储服务业 B.信息传播服务业 C.信息
下列哪种辅酶包含腺嘌呤?( )A.CoA B.FAD C.NADH D.
以下所列的过程中,()的过程能用△S=△H/T这一公式。A.真实气体绝热可逆膨胀
凡从事建筑装饰装修的企业,必须经建设行政主管部门进行资质审查,并取得资质证书后,
ASP的()对象可以向服务器提供浏览器版本信息。A.Request B.Res
体温调节中枢功能失常所致的发热见于A、中暑 B、脑膜炎 C、大叶性肺炎
经过50多年的发展,我国台湾地区资本市场建立起由“证券交易所集中市场—上柜市场—
1998-131.营分证候的病机特点是 A.营阴受损B.津液耗竭C.心神
工程项目的绿色施工方案应包括()。A.提高质量标准措施 B.降低成本措施
最新回复
(
0
)