We know that many animals do not stay in one place. Bird, 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 es, 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 the 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 bee 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.
【小题1】Most animals move from one place to another at a certain time to .A．give birthB．enjoy warmer weatherC．find food more easilyD．find beautiful places【小题2】The fish called “salmon” spends a long life in .A．salt waterB．riversC．fresh waterD．its birthplace【小题3】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.C
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(答案→)C
解析：文章向我们解释了动物的迁徙行为！
【小题1】细节题。根据第一段第三行most of them move to find food more easily。
【小题2】细节题。根据第二段4,5行This fish is born in fresh water but it travels many miles to salt water. There it spends its life.
【小题3】细节题。根据文章最后一段。