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(迁徙)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 cold, 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 king of lobster. 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 time we don’t. Maybe things just like to travel.
27.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
28.The fish called “salmon” spends a long life in ________.
A. salt water B. rivers C. fresh water D. its birthplace
29.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
30.The lobsters move _______.
A. to the fresh water B. to the sea floor C. at a certain time D. to find more food
31.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.
CACCD
A. Profits enlarging B. Technology developing C. Education investing D. Benefits transferring E. Dominance disappearing F. A nation rising |
The following is an imaginary diary entry written by US president. This diary is part of Global Trends 2025, which was written by the US National Intelligence Council
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The
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The
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Global wealth and economic power will shift from West to East.
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The transition from old fuels to new will be slow, as will the development of new technologies that present feasible alternatives to fossil fuels or help eliminate food and water problems. All current technologies are inadequate, and new ones will probably not be commercially possible by 2025