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    9．Chemicals also stay in the ground and underground water for a long time，______affects crops and，________，animals and humans．（　　）
    A．this； howeverB．that； therefore
    C．which； thereforeD．which； so

    分析 化学物质可停留在地面和地下水很长一段时间，这一点会影响庄稼因此也会影响动物和人类．

    解答 答案是C．考查定语从句，主句Chemicals also stay in the ground and underground water for a long time，化学物质可停留在地面和地下水很长一段时间这一点可影响植物，所以which指代的是主句整个句子的意思；此处therefore是副词，so是连词，根据句意"影响庄稼因此影响动物和人类"所以用therefore，故答案选C．

    点评 定语从句又称为形容词性从句，综观历年高考试题，我们可以发现该语法项目是测试中的热点与难点，解定语从句的题目首先要知道哪一句是主句，哪一句是从句，被修饰的词是谁，从句中的句子成分缺失什么，根据缺失成分的不同从而选出相对应的关系代词或者关系副词，从而选出正确的答案，解题的关键是从句句子的成分分析．

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