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(遷移)is probably the migration of the fish, which is calledsalmon. 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 north 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. Every year, when the season of bad weather arrives, the lobsters 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 ________.

[  ]

Agive birth

Benjoy warmer weather

Cfind food more easily

Dfind beautiful places

(2)The fish calledsalmonspends long life in ________.

[  ]

Asalt water

Brivers

Cfresh water

Dits birthplace

(3)The mice in north Europe leave their mountain when ________.

[  ]

Athey give birth

Bthe weather is bad

Cthe places get too crowded

Dthey haven't enough food

(4)The lobsters move ________.

[  ]

Ato the fresh water

Bto the sea floor

Cat a certain time

Dto find more food

(5) What is the main idea of the passage?

[  ]

AAnimals move in order to find food more easily.

BThe migration of the fish calledSalmonis the most famous migration.

CLiving things more from one place to another because they like to travel.

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

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