Deep inside the brain there is a clock that governs every aspect of the bodys functioning: sleep and wake cycles, levels of alertness, performance, mood, hormone levels, digestion, body temperature and so on. It regulates all of these functions on a 24-hour basis and is called the biological clock.
This body clocks programmes us to be sleepy twice a day, between 3-5am and again between 3-5pm. Afternoon tea and nap are all cultural responses to our natural biological sleepiness in the afternoon.
One of the major causes of the travelers malady known as jet lag is the non-alignment of apersons internal body clock with clocks in the external world. Crossing different time zones confuses thebiological clock, which then has to adjust to the new time and patterns of light and activity. To make matters more complex, not all internal body functions adjust at the same rate. So your sleep/wake may adjustto a new time zone at one rate, while your temperature adjusts at a different pace. Your digestion may beon a different schedule altogether.
Though we live in a 24-hour day, the natural tendency of the body clock is to extend our day beyond 24 hours. It is contrary to our biological programming to shrink our day.
That is why traveling in a westward direction is more body-clock friendly than flying east. NASA studies of long haul pilots showed that westward travel was associated with significantly better sleep quan-tity and quality than eastward flights.
When flying west, you are extending your day, thus traveling in the natural direction of your in-ternal clock. Flying eastward will involve shrinking or reducing your day and is in direct opposition to your internal clocks natural tendency.
One of the more common complaints of travelers is that their sleep becomes disrupted. There aremany reasons for this: changing time zones and schedules, changing light and activity levels, trying tosleep when your body clock is programmed to be awake, disruption of the internal biological clock andworking longer hours.
It is often suggested that you adjust your watch as soon as you board a plane, supposedly to try to help you adjust to your destinations schedule as soon as you arrive. But it can take the body clock several days to several weeks to fully adjust to a new time zone.
So, our body clock truly can govern us.
31.The role of the body clock is to.
A. enable us to sleep 6 hours a day
B. help us adapt to a 24-hour cycle
C. regulate the bodys functions
D. interfere with the bodys functions
32. The word malady in Paragraph 4 is closest in meaning to.
A. condition
B. discomfort
C. injury
D. excitement
33. Flying in a westward direction will .
A. help you sleep better
B. increase the degree of jet lag
C. shrink your day
D. make you overeat
34. Which of the following is NOT mentioned as a reason for the disrupted sleep of travelers?
A. Crossing different time zones.
B. Changing light and activity levels.
C. Working longer hours.
D. Watching out of the plane for a long time.
35. It can be seen from the lasttwo paragraphs that .
A. you can control your own body clock
B. it is not difficult to adjust to a new time zone
C. adjusting your watch can help you avoid jet lag
D. there isnt much you can do to avoid jet lag
参考答案:31. C 32. B 33. A 34. D 35. D
牛神国:印度高中考试千人作弊
怎样优雅地让对方闭嘴?
国际英语资讯:Disused plane sunk in Jordans Aqaba to enrich marine habitat
英国之病,谁人能救
教育好孩子,把握好分寸很重要
啥东西都舍不得扔?你可能患上了囤积强迫症!
澳商店收取“观赏费” 防止只看不买
英国兴起哭丧服务 一小时45英镑
国际英语资讯:Brazil, Colombia discuss joint plan over Amazon
乐天:鲜为人知的电商巨头
以为中了彩票大奖会让你永远快乐吗?
挪威教授建议航空公司按乘客体重定票价
电子香烟:烟草业巨头面临一大挑战
报道称iPhone射频辐射超出安全极限
婚礼取消了!订婚戒指归谁所有?
不肯跟女朋友分享冰淇淋的男人:NBA球迷欢乐瞬间
研究:夜猫子收入更高
大学生就业仍然遭遇性别歧视
The Change of Made in China 中国制造的改变
移动:5大笔记软件盘点
国内英语资讯:Seminar on Xis expositions on historical sciences held in Beijing
“地球之肺”在燃烧!巴西派军队赴亚马孙雨林灭火
美国熊孩子考卷上的神回答:你会给他打多少分?
17岁学生研发应用被雅虎天价收购
金发已过时 男人更爱娶深发女做老婆
早睡早起身体好?夜猫子们工作好收入更高!
企业的现金属于谁?
网曝6名外国人在上海高架桥上集体小便
儿童选择奖揭晓 斯图尔特独揽双奖满载而归
澳科学家研制抗衰老药有突破 长生不老或不再是神话
不限 |
英语教案 |
英语课件 |
英语试题 |
不限 |
不限 |
上册 |
下册 |
不限 |