Fire can help people in many ways. But it can also be very harmful. Fire can heat water, warm your houses, give light, and cook food. But fire can burn things too. It can burn trees, houses, animals, or people. Sometimes big fires can burn forests.

Nobody knows for sure how people began to use fire. But there are many interesting old stories about the first time a man or woman started a fire. One story from Australia tells about a man a long time ago. He went up to the sun by a rope and brought fire down.

Today people know how to make a fire with matches（火柴）．Children sometimes like to play with them. But matches can be very dangerous. One match can burn a piece of paper, and then it might burn a house. A small fire can become a big fire very fast.

Fires kill many people every year. So you must be careful with matches. You should also learn to put out fires. Fires need oxygen（氧氣）．Without oxygen they die. There is oxygen in the air. Cover a fire with water, sand, or with your coat or something else in an emergency（緊急情況）．This keeps the air away from a fire and kills it.

Be careful with fire, and it will help you. Be careless with fire, and it will burn you.

1．Which of the following is true?

 A．We are not sure how people started to use fire

 B．It is not an Australian who started a fire.

 C．We know how people began to use fire.

 D．Nobody knows how to make a fire

2．Children mustn’t play with matches because_______.
 A．matches burn paper           B．it is not interesting

 C．matches can be dangerous     D．they don’t know how to make a fire with matches

3．If you are going to put out (撲滅) a fire,　you       .

 A．must be careful with matches        B．ought to know it can be useful

 C．have to cover it with water only     D．should keep air away from it

4．We must be careful with fire, or it _______.

A．can die            B．warms our houses 

C．might burn us       D．will heat water

5．What is the main idea of the passage?

A．Fire can not help people in many ways. 

B．Fire can be both helpful and harmful.

C．We shouldn’t use matches in our life.    

D．We must be careful with matches.

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