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Next autumn when you see wild geese heading south for the winter flying in a V formation, you might think about what scientists have discovered as to why they fly that way.

As each bird flaps its wings, it creates uplift(提升) for the bird immediately following. By flying in a V formation the whole group adds at least 71% greater flying range than if each bird flies on its own.

People who share a common direction and sense of community can get where they are going more quickly and easily because they are traveling on the push of one another.

When a wild goose falls out of the formation,it suddenly feels the drag and resistance of trying to go alone and quickly tries to get back into the formation to take advantage of the lifting power of the bird in front. When the head goose gets tired,it flies back into the formation and another goose flies to the front. It is wise to take turns doing difficult jobs whether it is people or wild geese flying south.

Wild geese honk (发出雁叫声) from behind to inspire those up front to keep up their speed. What can we learn from this?

When a wild goose gets sick or wounded by gunshots,and falls out of the formation,two other geese will fall out with that goose and follow it down to lend help and protection. They will stay with the fallen goose until it is able to fly or until it dies,and only then will they go on with their own or with another formation to catch up with their group.

1.Wild geese fly in a V formation in order to________.

A. protect themselves from danger

B. fly more quickly and easily

C. help the sick and wounded

D. fly much higher in the sky

2.What can we learn from the fifth paragraph?

A. We should try to lead others to move forward.

B. We should give people facing difficulties encouragement.

C. We should believe in those who offer us help.

D. We should care more about the old and sick.

3.When a wild goose becomes sick or is wounded,________.

A. it will be left alone and will fall on the ground

B. the whole group will stop flying

C. two other geese will stay with it to offer help

D. other geese will honk to give it encouragement

4.What do we know from the passage?

A. A wild goose can help the one following it by flapping its wings.

B. A person who works alone can work better than one who doesn’t.

C. It is not good for wild geese to take turns being the head goose.

D. The wild geese that fall behind are unlikely to catch up with their group.

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