◎ 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
    根据魔方格专家分析,试题“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. …”主要考查了你对  【动词短语】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。