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  3. One of the most dangerous accidents is catching fire. You should be careful with fires. People who are not careful sometimes cau

One of the most dangerous accidents is catching fire. You should be careful with fires. People who are not careful sometimes cau

admin2012-10-09  75
问题    One of the most dangerous accidents is catching fire. You should be careful with fires. People who are not careful sometimes cause fires that bum buildings and  (11)  . If you are ever in a burning building, crawl (爬) on the floor to the door and get o
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答案forests
解析 One of the most dangerous accidents is catching fire. You should be careful with fires. People who are not careful sometimes cause fires that bum buildings and forests. If you are ever in a burning building, crawl (爬) on the floor to the door and get out. The smoke and heat from the fire are in the upper part of a room. The air near the floor is cooler and fresher. If your clothes get on fire, roll on the floor to shut out the air. With no air, the fire will go out. Firemen sometimes use water to put out fires. The water cools the burning material so that the fire goes out.
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