大学英语改错练习题.doc

改错练习(1) （一） 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 bodys 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. 二 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 Jul