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We know that many animals do not stay in one place．Birds，fish and other animals move from one place to another place 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 is probably the migration of fish，which is called “salmon”（鲑鱼）．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，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 place，but at other times we don’t．Maybe living things just like to travel．
【小题1】The reason for most of the animals to move is __________________．
【小题2】Find the word in the passage which means “ the movement from one place to another of a large group of animals” and write it down here: __________________．
【小题3】The underlined word “There” in the second paragraph refers to (指的是) ____________．
【小题4】The salmon comes back to its birthplace in order to __________________．
【小题5】The lobsters begin to move to another place when __________________． 查看习题详情和答案>>
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When cold weather comes, many birds move to warmer places to find food. Some fish give birth in warm water and move to cold water to feed. The most famous migration(迁移) of the fish, which is called “salmon(大马哈)”. 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 crowed. 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 others times we don’t. Maybe living things just like to travel.
| Migrations | |
| Some birds | 小题1:_______ when cold weather comes |
| Some fish | Give birth in小题2:______and move to ______ to feed |
| A kind of mouse | 小题3:________ when they become too crowed. |
| 小题4:_________ | Walk across the floor of the ocean when the season of 小题5: _______ |
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 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. In northern Europe, there is a kind of mouse. They leave their mountain homes when they bccome too crowded. They move down to the low land. Sometimes they move all the way the seadide,and many of them are killed when they fall into the sea.
Recently, scientists have studied the migration of 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 know 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 birth B.enjoy warmer weather C.find food more easily
【小题2】The fish called “salmon”spends a long time in____
A.salt water B.rivers C.fresh water
【小题3】The mice in northern Europe move when_____
A.they give birth B.the place gets too crowded
C.they haven’t enough food
【小题4】 The lobsters move_______.
A.to the fresh water B.at a certain time C.to find more food
【小题5】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. 查看习题详情和答案>>