2012英语四级改错练习题及答案精选(1)

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.