题目内容：
( )1. Which is true?A. We are not sure how people started to use fire.
B. It is 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 a fire, you ______.
A. must be careful with matches
B. ought to know it can be harmful
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 be
B. warms our houses
C. might burn us
D. will help us
( )5. What is the main idea of the passage?
A. Fire can help people in many ways.
B. Fire can be both helpful and harmful.
C. Fire can burn things and people
D. We must be careful with matches.
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