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 化學(xué)物質(zhì)可停留在地面和地下水很長(zhǎng)一段時(shí)間，這一點(diǎn)會(huì)影響莊稼因此也會(huì)影響動(dòng)物和人類．

解答 答案是C．考查定語從句，主句Chemicals also stay in the ground and underground water for a long time，化學(xué)物質(zhì)可停留在地面和地下水很長(zhǎng)一段時(shí)間這一點(diǎn)可影響植物，所以which指代的是主句整個(gè)句子的意思；此處therefore是副詞，so是連詞，根據(jù)句意"影響莊稼因此影響動(dòng)物和人類"所以用therefore，故答案選C．

點(diǎn)評(píng) 定語從句又稱為形容詞性從句，綜觀歷年高考試題，我們可以發(fā)現(xiàn)該語法項(xiàng)目是測(cè)試中的熱點(diǎn)與難點(diǎn)，解定語從句的題目首先要知道哪一句是主句，哪一句是從句，被修飾的詞是誰，從句中的句子成分缺失什么，根據(jù)缺失成分的不同從而選出相對(duì)應(yīng)的關(guān)系代詞或者關(guān)系副詞，從而選出正確的答案，解題的關(guān)鍵是從句句子的成分分析．

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