单项选择题

When you are going to put out a fire, you （）

A．must be careful
B．should keep air away from it
C．must know it is dangerous
D．should cover it with water only

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单项选择题
Which of the following is the main idea of this passage（）

A．Fire can help people in many ways.
B．Fire can be both helpful and dangerous.
C．Fire can burn things and people.
D．We must be careful with matches.
单项选择题
We must be careful with fire, or it（）

A．will die
B．will warm our houses
C．might burn us
D．will help us
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