Question

It is hard to believe that a fish less than 30 centimeters long can be dangerous to people and to other sea animals. Yet the piranha(水虎鱼)swims in the dark waters of South America, ready to bite whenever it is hungry.

Many fish eat plants, but the piranha is one of a small group that eats meat. With its sharp teeth and strong jaws, the piranha most often kills other fish. Sometimes, however, it attacks people.

A person will not die from a single bite, but the blood from the wound attracts other piranhas. Soon a school of as many as a thousand fish gather by the victim. They all begin to bite. In minutes, only a skeleton(骨架)is left.

Perhaps the strangest thing about piranhas is that they are not always dangerous. People may safely swim near them in one river, while in another river only a few miles away, may be attacked.

Until several years ago, you could buy piranhas in the United States pet stores. Now there is a law against bringing piranhas into the country to sell them. Many people were afraid that the fish might get loose in lakes or streams.

The underlined word "school" probably means "________".

A. a place to learn knowledge   B. a large group    C. a long river    D. small pupils

Why is there a law against bringing piranhas into the United States?

A. Because there are enough piranhas in lakes already.

B. Because piranhas are not safe to eat.

C. Because piranhas die too easily.

D. Because piranhas might get loose and attack swimmers.

What is the main idea of the passage?

A. Piranhas make good pets.                 B. Piranhas are 30 centimeters long.

C. Piranhas swim in South American waters.    D. Piranhas can be dangerous.

Answer 1

【小题1】B

【小题2】D

【小题3】D

解析:

【小题1】从第三段的上下文中可猜测出school的词义:水虎鱼咬一口不会丧命,但伤口处流出来的血会把其它的水虎鱼吸引过来,很快,多达上千条的水虎鱼聚集到受害者身旁。

【小题2】短文最后一段即本题答案出处。

【小题3】本文主要讲述了水虎鱼的危险性,它对人的生命构成了威胁。