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问题 选择题

下列有四个命题：①零是最小的实数②数轴上的点不能表示所有的实数③带根号的数就是无理数④一个正数的平方根有两个，它们互为相反数，其中正确个数是（　　）

A．1个

B．2个

C．3个

D．4个

答案

①零是最小的实数，错误；

②数轴上的点能表示所有的实数，故原命题错误；

③带根号的数不一定是无理数，故原命题错误；

④一个正数的平方根有两个，它们互为相反数，故原命题正确；

故选A．

单项选择题

Aspirin is one of the safest and most effective drugs invented by man. The most popular medicine in the world today, it is an effective pain reliever. Its bad effects are relatively mild. It is also cheap.For millions of people suffering from arthritis, 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, although relatively mild, are largely unrecognized among users.Although aspirin was first sold by a German company in 1899, it has been around much longer than that. Hippocrates, in ancient Greece, understood the medical value of tree barks and leaves which today are known to contain a chemical found in aspirin. During the 19th century, there was a great deal of experimentation in Europe with this chemical, and it led to the introduction of aspirin. By 1915, aspirin tablets were available in the United States.A small quantity of aspirin relieves pain and inflammation. It also reduces fever by affecting some of the body’’s reactions. Aspirin is very irritating to the stomach lining. The best way is to chew the tablets before swallowing them with water, but few people can stand the bitter taste. Some people suggest crushing the tablets in milk or orange juice.

The author of this passage seems to be________.

A．against aspirin

B．in favor of aspirin

C．ignorant of aspirin

D．disinterested in aspirin
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判断题

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