◎ 题干
When something is on fire, people throw sand (沙子) on it to put out the fire.
The main use of the sand is to _____.
[     ]
A. protect the thing on fire
B. add weight to the thing on fire
C. keep the air away from the thing on fire
D. lower the temperature of the thing on fire
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◎ 解析
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◎ 知识点
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