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    Nowadays, it is possible to travel to distant parts of the globe in several hours. This can result in the traveler ending up in a part of the world where time is different from his or her own “body clock” ,which control our sleep patterns.
    If we travel east or west by more than four time zones (hours) then we will usually be affected.
    In the past when people traveled by sea, there was enough time for the body to adjust to the local time, but with the advent of modern high speed aircraft the body does not have time to adjust. Therefore, there is the term “jet lag(时差反应)”. It normally takes one day per time zone (hour) for the body to adjust to its new surroundings.
    The effects of jet lag are usually tiredness and insomnia (失眠) but can also include: poor concentration, nausea (恶心) ,vomiting (呕吐), constipation (便秘) and general malaise (不舒服). The effects are made worse by alcohol.
    Sleeping while flying may help to reduce the symptoms (症状) of jet lag, but long periods of immobility aboard aircraft can make the traveler feel numb(麻木的) in the legs. The following are some other tips of reducing the symptoms of jet lag:
    ①Avoid traveling when you are already tired and rest before departure.
    ②Stopovers on long flights may be helpful.
    ③A relaxed flight is important.
    ④Sleeping tablets will help you to sleep and be correspondingly alert (相对警惕的) during the next day, but they do not speed up adjustment to the new time zone.
    ⑤Remember the actual traveling time will usually be at least twice the actual time spent in the air since it will include traveling to and from and hanging around in airports.
    ⑥Avoid heavy commitments on the first day after arrival.
    72. The following are the effects of jet lag EXCEPT _____.
    A. tiredness          B. coughing           C. insomnia           D. vomiting
    73. The word “immobility” in the fifth paragraph means “_____”.
    A. stillness           B. movement         C. activity             D. happiness
    74. We can reduce the symptoms of jet lag by _____.
    A. drinking some alcohol           B. keeping ourselves awake
    C. taking some medicine            D. sleeping while flying
    75. What is the main purpose of the passage?
    A. To suggest people travel by sea instead of by air.        
    B. To tell people the effects of jet lag.
    C. To give people some advice about reducing the symptoms of jet lag.
    D. To tell people about their body clock.
    71—75 BADC
    时差反应就是人们在旅行4个时区后产生的失眠、呕吐、恶心等症状，本文将介绍如何减轻时差反应。
    72. B。对照文章第四段The effects of jet lag are usually tiredness and insomnia but can also include: poor concentration, nausea, vomiting, constipation and general malaise.
    可以轻松找到答案。
    73. A。从文中Sleeping while flying和make the traveler feel numb in the legs“使旅客腿部麻木”可以猜测到最长时间的不活动。
    74. D。从文章最后一段Sleeping while flying may help to reduce the symptom of jet lag…可知。
    75. C。文章先解释了什么叫jet lag,然后阐述了jet lag给人带来的不适，最后给出一些建议，所以这篇文章的主要目的还是告诉人们一些如何应对jet lag的方法。
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    B
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