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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 f

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 f

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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 longtime 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 a-way from a fire and kills it. Be careful with fire, and it will help you. Be careless with fire, and it will burn you.
How did people begin to use a fire?
选项 A、We know how people began to use fire.
B、Nobody knows how to make a fire.
C、It was an Australian who started a fire.
D、We are not sure how people started a fire.
答案D
解析 事实细节题。见文章第二段第一句“Nobody knows for sure how people began to use fire”。
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