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1、改错练习(1)（一）Americans this year will swallow 15000 tons ofaspirin, 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 badeffects are relatively mild, and it is cheap.For millions of people suffered from art
2、hrities, 3._it is the only thing that works. Aspirin, in short, istruly the 20th-century wonder drug. It is also thesecond largest suicide drug and is the leading cause ofpoisoning among children. it has side effects that, if 4._relatively mild, are largely unrecognized between users. 5._Although as
3、pirin was first sold by Germam companyin 1899, it has been around much longer than that.Hippocrates, in ancient Greece, understood the medical valueof the leaves and tree bark which today is known to 6._contain salicylates, the chemical in aspirin. during the19th century, there was a great number of
4、 experimentation 7._in Europe with this chemical, and it led in the introduction 8._of aspirin. By 1915, aspirin tablets were availablein 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
5、 bodys reactions.Specifically, aspirin seems to slow down the formationof the acids involved in pain and the complex chemicalreactions that cause fever. The chemistry of these acidsis not fully understood, and the slowing effect of aspirin 10._is well known. 二Crime has its own cycles, a magazine rep
6、ortedsome years before. Police records that were studied 1._for five years from over 2400 cities and towns showa surprised link between changes in the season and 2._crime patterns.The pattern of crime has varied very littleover a long period of years. Murder reaches its highduring July and August, a
7、s 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 percentof 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 likelyto be
8、ing robbed between 6 p.m. and 2 a.m. on a Saturday 5._night in December, January,or February. The mostuncriminal month of all? May-except for one strangestatistic. More dog bites are reported in this monththan in an other month of the year. 6._Apparent our intellectual seasonal cycles are 7._complet
9、ely different from our criminal tendencies.professor Huntington, of the Foundation for the Studyof Cycles, made extensive studies to discover theseasons when people read serious books, attend scientificmeetings, make the highest scores on examinations,and to propose the most changes to patents. In a
10、ll 8._instances, he found a spring peak and an autumn peakseparated by a summer low. On other hand, Professor 9._huntintons studies indicated that June is the peakmonth for suicides and admissions in mental hospitals. 10._June is also a peak month for marriages!三Only a generation ago, Mauritanias ca
11、pital city wasmany days 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 theeye can see.In some parts of the Amazon rain forest in brazil, allthe trees have cut down. The earth lies bar
12、e and dry in the 3._hot sun. Nothing grow there anymore. 4._Over vast areas of every continent, the rainfall andvegetation necessary for life is disappearing. Already 5._more than 40 percent of the earths land is desert and 6._desert-like. About 628 million people-one out of seven-live in these dry
13、regions. In the past, they have managed tosurvive, but in difficulty. Now, largely through problems 7._caused by modern life, our existence is threatened by the 8._slow, steady spread of the earths deserts.Many countries first became concerned in 1970s after 9._a terrible drought and famine destroye
14、d Africas Sahel,the fragile desert along the south edge of the Sahara.Thousands of people died even though there was a worldwideeffort to send food and medicine to the starved people. 10._四 Although AsianAmericans make up only 2.4 percent of thenations population, it constitute 17.1 percent of 1. _undergraduates at Harvard, 18 percent 2. _at the Massachusetts Institute of Technologyand 27.3 percent at the University of Californiaat Berkeley. Why
