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    People cut down too many trees, _____ the greenhouse effect becomes more and more serious.

    A．soB．becauseC．althoughD．if

    A

    解析试题分析：so 因此；because 因为；although虽然，尽管； if是否，如果。句意：人们砍伐了太多的树木，因此温室效应变得越来越严重。结合语境可知选A。
    考点：连词辨析
    点评：连词在句子中主要起联系上下文的作用，他们之间的区别就是表示逻辑关系的不同，所以在解题时先要理解上下文含义，然后根据上下文逻辑关系选择合适的连词。连词的用法都比较多，语义之间还有交叉，熟记其基本应用规则，了解其区别，注意固定搭配对象，是做好此类题型的关键。

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