Question

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. 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 (近来), scientists have studied the migration of a kind of lobster (龙虾). Every year, when the season of the 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. find food more easily

C. enjoy warmer weather D. find beautiful places

2. The mice in northern Europe move when _______.

A. they give birth

B. they haven’t enough food

C. the weather is bad

D. the place gets too crowded

3. What is the main idea of the passage?

A. Animals move to find food more easily.

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

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

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

Answer

1.B

2.D

3.C

【解析】

试题分析：我们知道许多动物不呆在一个地方，移动的原因不同，有些动物是为了更容易地觅食。但也有一些动物是因为所居住的环境太拥挤。有时我们知道为什么人类和动物从一个地方搬到另一个地方，但是有时候我们却不知道原因。

1.B细节理解题，根据文中语句“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.”理解可知。它们移动的原因是为了更容易地觅食。故答案为B。

2.D细节理解题 ，根据文中语句“They leave their mountain homes when they become too crowded.” 可知，它们离开它们的家园是因为它们的家变得太拥挤了。故答案为D。

3.C主旨大意题。，根据文中最后一段的语句“So, sometimes we know why humans and animals move from one place to another, but at other times we don’t.”可知，有时我们知道为什么人类和动物从一个地方搬到另一个地方，但是有时候我们却不知道原因。这就是本文的主题。故答案为C。

考点：科普知识短文阅读。