Question

The population of the world is increasing rapidly. By 2020, there could be 7.5 billion people on the earth. Will there be enough food for all these people? Some scientists think fish farming might solve this problem. However, other scientists worry that fish farming could bring serious environmental problems.

Fish farming is not a new thing. There were fish farms in China 3,000 years ago. Today, about one third of the fish we eat comes from fish farms.

Most fish farms raise plant-eating fish. Popular kinds of plant-eating fish are carp, tilapia, and catfish. However, many fish farms are starting to raise meat-eating fish. A popular type of meat-eating fish is salmon. However, it takes up to 5 tons of wild fish to produce just 1 ton of farm-raised salmon. So if this continued, many types of wild fish could become extinct.

Critics (评论家) of fish farming also say that farm-raised fish is unhealthy. They say there are dangerous chemicals (化学物质) in the fish. They also say fish farming pollutes the water. Some people say that the ways of farming being used now won’t produce enough fish anyway. Instead of building fish farms in lakes or near the coast, they say that the fish farms could be moved far out into the ocean. In the future, fish farms might be large cages that move to the ocean.

1.Which of the following about fish farming is true?

A. It is very popular around the world.

B. It is a new thing in 2010.

C. It appeared in China about thirty centuries ago.

D. It can solve the problem of the world’s population.

2._________ is not a kind of plant-eating fish.

A. Carp           B. Catfish

C. Tilapia        D. Salmon

3.What does the underlined word “extinct” mean?

A. 绝种的       B. 无家可归的

C. 弱小的      D. 惊慌失措的

4.How many reasons do the critics hold against the fish farming?

A. 2.    B. 3.     C. 4.        D. 5.

5. What’s the passage mainly about?

A. One way to control the growth of population.

B. One way to feed more people.

C. One way to catch more fish.

D. One way to save the wild fish.

Answer

1.C

2.D

3.A

4.A

5.B

【解析】

试题分析：文章主要讲诉了随着世界人口的日益增加，渔业养殖可以解决人们的食物问题，但也会带来环境污染问题。于是有人建议，可以把渔场搬到海洋深处。

1.

2.D细节理解题。依据短文中的句子：Popular kinds of plant-eating fish are carp, tilapia, and catfish.可知，大多鱼塘都养以植物为食的鱼类。这种鱼的典型代表是鲤鱼、罗非鱼和鲶鱼。故不含答案D。

3.A词意猜测题。依据短文中的句子：However, it takes up to 5 tons of wild fish to produce just 1 ton of farm-raised salmon.可知，投入5吨的野生鱼只能得到1吨的鲑鱼。数目在减少，如果继续下去，可能导致灭绝。故答案为A。

4.A细节理解题。依据短文中的句子：They say there are dangerous chemicals (化学物质) in the fish. They also say fish farming pollutes the water.可知，评论家反对养鱼有两大理由。故答案为A。

5.主旨大意题。由短文第一段的内容可知，随着世界人口的日益增加，渔业养殖可以解决人们的食物问题，故答案为B。

考点：科普环保类短文阅读。