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    When something is on fire, people throw sand on it to put out the fire. The main use of the sand is to _________.

    A. protect the thing on fire

    B. add weigh to the thing on fire

    C. keep the air away from the thing on fire

    D. lower the temperature of the thing on fire

     

    C

    【解析】

    试题分析：句意：当什么东西着火了，人们把沙子撒上去是为了扑灭火。沙的主要使用是将空气与着火的东西隔绝。protect the thing on fire保护着火的东西；add weigh to the thing on fire加权对火灾的事keep the air away from the thing on fire将空气与着火的东西隔绝；lower the temperature of the thing on fire降低着火的东西的温度。所以选C。

    考点：考查固定句型。

     

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