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    1．If the house is ____ fire，_____ where is the nearest exit．（　　）
    A．in； findB．on； find outC．catches； findD．on； find

    分析 如果房子着火了，弄清楚最近的出口．

    解答 答案：B．be on fire 着火，为固定搭配，A in错误，C catches前不能使用is，而where is the nearest exit是需要查清楚的内容，应使用find out．find侧重找到，find out侧重找出，弄清楚，查明白．

    点评 本题考查介词的辨析及find/find out的区别．平时应多注重固定介词短语的搭配及相近单词或短语的区别．

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