单选题
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 birth- place 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 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.
单选题
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
D. find beautiful places
【正确答案】
C
【答案解析】[解析] 关键信息为most of them move to find food more easily…，故选C。
单选题
The mice in northern Europe move when ______.
A. they give birth
B. the weather is bad
C. the place gets too crowded
D. they haven't enough food
【正确答案】
C
【答案解析】[解析] 关键信息为They leave their mountain homes when they become too crowded．故选C。
单选题
The lobsters move ______.
A. w the fresh water
B. to the sea floor
C. at a certain time
D. to find more food
【正确答案】
C
【答案解析】[解析] 见第三段第二句。故选C。
单选题
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.