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.a(chǎn)nalyze 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 本文屬于說明文閱讀,作者通過這篇文章主要向我們描述了一項(xiàng)對于生物鐘的研究,表明待在戶外接受陽光可以重置生物鐘.
解答 32.B.細(xì)節(jié)理解題.根據(jù)倒數(shù)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訴我們調(diào)整生物鐘的一種可能的方式;故選B.
33.A.詞義猜測題.根據(jù)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可知麻煩的是,當(dāng)你的鬧鐘在早上響起時你的褪黑激素水平的任何仍然很高,這導(dǎo)致昏昏沉沉;意為疲憊的;故選A.
34.C.推理判斷題.根據(jù)文章By contrast,the body clocks of the group that stayed home shifted even later over the course of the weekend可知萊特的團(tuán)隊(duì)從他們的實(shí)驗(yàn)中發(fā)現(xiàn)了呆在戶外的人在很短的時間內(nèi)重置生物鐘;故選C
35.D.細(xì)節(jié)理解題.根據(jù)倒數(shù)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可知為了改善我們的睡眠習(xí)慣,我們最好在白天增加自然光對你的照射,并且減少晚上你看到的人造光的數(shù)量;故選D
點(diǎn)評 考察學(xué)生的細(xì)節(jié)理解和推理判斷能力,做細(xì)節(jié)理解題時一定要找到文章中的原句,和題干進(jìn)行比較,再做出正確的選擇.在做推理判斷題不要以個人的主觀想象代替文章的事實(shí),要根據(jù)文章事實(shí)進(jìn)行合乎邏輯的推理判斷.