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  3. Fire can help people in many ways. But it can also be very dangerous. Fire can heat (加热) water, warm houses, give light and cook

Fire can help people in many ways. But it can also be very dangerous. Fire can heat (加热) water, warm houses, give light and cook

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问题     Fire can help people in many ways. But it can also be very dangerous. Fire can heat (加热) water, warm 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 a woman started a fire. One story from Australia tells about a man very, very long time ago. He went up to the sun by a rope (绳子) 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 (熄灭) fires. Fires need oxygen (氧气). Without oxygen they will die. There is oxygen in the fire. Cover a fire with water, sand, or sometimes with your coat. This keeps the air away from a fire and kills it. Be careful with fire; and it will help you. Be care less with fire, and it will burn you.
Which of the following is the main idea of this passage?
选项 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.
答案B
解析 考查学生对中心思想的判断和归纳能力。第1段的第1、2句实际上是全文的论点，故B为正确答案。
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