We know that many animals do not stay in one place.Birds,fish and other animals move from

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 time 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 waterC．find food more easilyD．find beautiful places【小题2】The mice in northern Europe move when .A．they give birthB．the weather is badC．the place gets too crowdedD．they haven’t enough food【小题3】The lobsters move .A．to the fresh waterB．to the deeper seaC．at a certain timeD．to find more foodC

(答案→)C 解析：【小题1】见第一段第三句。【小题2】见第二段倒数二、三句。【小题3】见第三段第一、二句。

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