Question

阅读理解

　　We know that many animals do not stay in one place. Birds, fish and other animals move from one place to another at a certain time. They move for different reasons：most of them move to find food more easily, but others move to get away from places that are too crowded.

　　When cold weather comes, many birds move to warmer places to find food. Some fishes give birth in warm water and move to cold water to feed. The most famous migration(迁移)is probably the migration of fish, which is called “salmon”. This fish is born in fresh water but it travels many miles to salt water. There it spends its life. When it is old, it returns to its birthplace in fresh water. Then it gives birth and dies there. In northern Europe, there is a kind of mouse. They leave their mountain homes when they become too crowded. They move down to the low land. Sometimes they move all the way to the seaside, and many of them are killed when they fall into the sea.

　　Recently, scientists have studied the migration of a kind of lobster(龙虾). Every year, when the season of bad weather arrives, the lobsters get into a long line and start to walk across the floor of the ocean. Nobody knows why they do this, and nobody knows where they go.

　　So, sometimes we know why humans and animals move from one place to another, but at other times we don't. Maybe living things just like to travel.

1．Most animals move from one place to another at a certain time to ________.

[　　]

A．give birth

B．enjoy warmer weather

C．find food more easily

D．find beautiful places

2．The fish called “salmon” spends a long life in ________.

[　　]

A．salt water

B．rivers

C．fresh water

D．its birthplace

3．The mouse in northern Europe move when ________.

[　　]

A．they give birth

B．the weather is bad

C．the place gets too crowded

D．they haven't enough food

4．What is the main idea of the passage?

[　　]

A．Animals move in order to find food more easily.

B．The migration of the fish called “salmon” is the most famous migration.

C．Living things move from one place to another because they like to travel.

D．Sometimes we know why and how living things move from one place to another, but sometimes we don't.

Answer 1

答案：C;A;C;D
解析：

1．C　　起初一看，四个选项在文中好像都有，但仔细看题干“most animals”的这一关键词语，可排除其余的选项。 　　2．A　　有关“salmon”的情况在第二自然段中做了叙述，这种鱼出生在淡水后到咸水地区居住。在那里度过的是一生中绝大部分时光，到老了以后又回到它出生时的淡水中去。应分析题干中的spends a long life和短文中的关键句There it spends its life． 　　3．C　　从They leave their mountain homes when they become too crowded．一句可知。 　　4．D　　文中第二自然段中叙述了salmon和北欧的一种老鼠迁移方向和原因；第三自然段叙述了龙虾的游动情况，但原因不知道。