英语四级改错练习题及答案
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    Americans this year will swallow 15000 tons of
    aspirin, one of safest and most effective drugs 1.__________
    invented by man. The most popular medicines in the 2.__________
    world today, it is an effective pain reliever. Its bad
    effects are relatively mild, and it is cheap.

    For millions of people suffered from arthrities, 3.__________
    it is the only thing that works. Aspirin, in short, is
    truly the 20th-century wonder drug. It is also the
    second largest suicide drug and is the leading cause of
    poisoning among children. it has side effects that, if 4.__________
    relatively mild, are largely unrecognized between users. 5.__________

    Although aspirin was first sold by Germam company
    in 1899, it has been around much longer than that.
    Hippocrates, in ancient Greece, understood the medical value
    of the leaves and tree bark which today is known to 6.__________
    contain salicylates, the chemical in aspirin. during the
    19th century, there was a great number of experimentation 7.__________
    in Europe with this chemical, and it led in the introduction 8.__________
    of aspirin. By 1915, aspirin tablets were available
    in the United States.

    A small quantity of aspirin(two five-grain tablets)
    relieves pain and inflammation. It also reduces down 9.__________
    fever by interfering with some of the body's reactions.
    Specifically, aspirin seems to slow down the formation
    of the acids involved in pain and the complex chemical
    reactions that cause fever. The chemistry of these acids
    is not fully understood, and the slowing effect of aspirin 10.__________
    is well known.



    参考答案 
    1. of ∧ safest → the
    2. medicines → medicine(or: drug)
    3. suffered → suffering
    4. if → though(or: although)
    5. between → among
    6. is → are
    7. number → deal(or: amount,quantity)
    8. in → to
    9. down → /
    10. and → but  
    Crime has its own cycles, a magazine reported
    some years before. Police records that were studied 1.__________
    for five years from over 2400 cities and towns show
    a surprised link between changes in the season and 2.__________
    crime patterns.

    The pattern of crime has varied very little
    over a long period of years. Murder reaches its high
    during July and August, as does rape and other violent 3.__________
    attacks.Murder, however, is more than seasonal: it is a 4.__________
    weekend crime. It is also a hightime crime: 62 percent
    of members are committed between 6 p.m. and 6 a.m.

    Unlike the summer high in crimes of bodily harm,
    burglary has a different cycle. You are most likely
    to being robbed between 6 p.m. and 2 a.m. on a Saturday 5.__________
    night in December, January,or February. The most
    uncriminal month of all? May--except for one strange
    statistic. More dog bites are reported in this month
    than in an other month of the year. 6.__________

    Apparent our intellectual seasonal cycles are 7.__________
    completely different from our criminal tendencies.
    professor Huntington, of the Foundation for the Study
    of Cycles, made extensive studies to discover the
    seasons when people read serious books, attend scientific
    meetings, make the highest scores on examinations,
    and to propose the most changes to patents. In all 8.__________
    instances, he found a spring peak and an autumn peak
    separated by a summer low. On other hand, Professor 9.__________
    huntinton's studies indicated that June is the peak
    month for suicides and admissions in mental hospitals. 10.__________
    June is also a peak month for marriages!




    参考答案 


    1. before → ago
    2. surprised → surprising
    3. does → do
    4. however → moreover
    5. being → be
    6. an → any
    7. apparent → apparently
    8. to(1) → /
    9. On ∧ other → the
    10. in → to    
    Only a generation ago, Mauritania's capital city was
    many day's walk from the Sahara. Today it is in the Sahara. 1.__________
    The sand blows through the city streets and piles up in 2.__________
    walls and fences. The desert stretches out as far as the
    eye can see.

    In some parts of the Amazon rain forest in brazil, all
    the trees have cut down. The earth lies bare and dry in the 3.__________
    hot sun. Nothing grow there anymore. 4.__________

    Over vast areas of every continent, the rainfall and
    vegetation necessary for life is disappearing. Already 5.__________
    more than 40 percent of the earth's land is desert and 6.__________
    desert-like. About 628 million people--one out of seven--
    live in these dry regions. In the past, they have managed to
    survive, but in difficulty. Now, largely through problems 7.__________
    caused by modern life, our existence is threatened by the 8.__________
    slow, steady spread of the earth's deserts.

    Many countries first became concerned in 1970s after 9.__________
    a terrible drought and famine destroyed Africa's Sahel,
    the fragile desert along the south edge of the Sahara.
    Thousands of people died even though there was a worldwide
    effort to send food and medicine to the starved people. 10.__________




    参考答案
    1. day's → days'
    2. in → against
    3. have ∧ cut → been
    4. grow → grows
    5. is → are
    6. and → or
    7. in → with
    8. our → their
    9. in ∧ 1970s → the

     
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