7．________ is it ________ has caused this global warming？（　�。�
A．What；whatB．What；thatC．How；howD．How；that

分析 是什么導(dǎo)致了全球變暖？

解答 答案是B．考查強(qiáng)調(diào)句，本題被強(qiáng)調(diào)部分是疑問詞what，根據(jù)強(qiáng)調(diào)句中強(qiáng)調(diào)疑問詞的固定結(jié)構(gòu)：特殊疑問詞+is/was it that…，所以答案選B．

點(diǎn)評(píng) 答強(qiáng)調(diào)句型這類題目，分析句子結(jié)構(gòu)是關(guān)鍵．隨著高考考點(diǎn)的不斷深入變化，強(qiáng)調(diào)句型總是以新的面孔出現(xiàn)，或本身發(fā)生變化，或與其他句式結(jié)構(gòu)相結(jié)合，然而萬變不離其宗，總是脫不掉it，be，that/who這一框架，它的句式特征1：Is/Was it+被強(qiáng)調(diào)部分+that…；結(jié)合特殊疑問詞構(gòu)成特殊疑問句形式．句式特征2：特殊疑問詞+is/was it that…？理解句意掌握特征能夠很好的把握解題的技巧．

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