题目内容
14.The circadian clock,more commonly known as the body clock,is an internal system that tells our bodies when it's time to go to sleep and when it's time to wake up.Scientists track this clock by measuring the amount of melatonin(褪黑激素) circulating in a person's blood at any given time.In a healthy sleeper,melatonin levels rise a few hours before bedtime,stay high through the night,and then settle back down when it's time to wake up.
In our modern society,however,most of us stay up many hours past sunset and would probably sleep in many hours after sunrise if we could.
And the trouble is,your melatonin levels any still be high when your alarm clock goes off in the morning,which leads to grogginess.It may also have other health consequences as well,such as diabetes,overweight and heart disease.
Professor Kenneth Wright of the University of Colorado in the US wanted to see if our body clocks can be reset by a short stay in nature.His team recruited(招募) 14 physically active volunteers in their 20s and 30s.Nine went on a weekend camping trip,while the other five stayed home.
At the end of the weekend,the researchers reported that in just two days,the campers'body clocks had shifted so that their melatonin levels began to rise more than an hour earlier than they did before they left on the trip.By contrast,the body clocks of the group that stayed home shifted even later over the course of the weekend.
"This tells us we can reset our clocks fast,"Wright said.
Therefore,if you want to change your sleep patterns you could try to increase your exposure to natural light during the day and decrease the amount of artificial light you see at night.
And if that doesn't work,there's always camping.
32.The author wrote this article mainly toB.
A.explain how not sleeping enough is bad for our health
B.inform us of a possible way to adjust the circadian clock
C.analyze how the circadian clock influences our sleeping habits
D.explore how the circadian clock is connected with melatonin levels
33.The underlined word"grogginess"in paragraph 4probably meansA.
A.tiredness
B.excitement
C.refreshment
D.pressure
34.What did Wright's team discover from their experiment?C
A.The body clocks of the two groups didn't show much difference.
B.The body clocks of those who stayed at home remained the same.
C.Those staying outdoors reset the clock inside their bodies over a short period.
D.Changes to the circadian clock don't necessarily affect melatonin levels in our bodies.
35.According to the article,to improve our sleeping habit,we'd betterD.
A.set an alarm clock to go off every morning.
B.try to reduce melatonin levels at night.
C.spend weeks sleeping outdoors
D.expose ourselves to more natural light in the day and less at night.
分析 本文属于说明文阅读,作者通过这篇文章主要向我们描述了一项对于生物钟的研究,表明待在户外接受阳光可以重置生物钟.
解答 32.B.细节理解题.根据倒数第二段Therefore,if you want to change your sleep patterns you could try to increase your exposure to natural light during the day and decrease the amount of artificial light you see at night可知文章的目的是告诉我们调整生物钟的一种可能的方式;故选B.
33.A.词义猜测题.根据第四段And the trouble is,your melatonin levels any still be high when your alarm clock goes off in the morning,which leads to grogginess可知麻烦的是,当你的闹钟在早上响起时你的褪黑激素水平的任何仍然很高,这导致昏昏沉沉;意为疲惫的;故选A.
34.C.推理判断题.根据文章By contrast,the body clocks of the group that stayed home shifted even later over the course of the weekend可知莱特的团队从他们的实验中发现了呆在户外的人在很短的时间内重置生物钟;故选C
35.D.细节理解题.根据倒数第二段Therefore,if you want to change your sleep patterns you could try to increase your exposure to natural light during the day and decrease the amount of artificial light you see at night可知为了改善我们的睡眠习惯,我们最好在白天增加自然光对你的照射,并且减少晚上你看到的人造光的数量;故选D
点评 考察学生的细节理解和推理判断能力,做细节理解题时一定要找到文章中的原句,和题干进行比较,再做出正确的选择.在做推理判断题不要以个人的主观想象代替文章的事实,要根据文章事实进行合乎逻辑的推理判断.
A. | Tasting | B. | Tasted | C. | Being tasted | D. | To taste |
A. | to have resulted | B. | resulting | ||
C. | resulted | D. | having resulted |
A. | being combined | B. | combining | C. | combined | D. | to combine |