题目内容
1．The air quality in the city，______ is shown in the report，has improved over the past two months．（ ）| A． | that | B． | it | C． | as | D． | what |
分析 我们城市的空气质量，据报道已经改善了很多．
解答 答案C．通过分析句子成分可知，这里是as引导的定语从句，as正如，在这里作主语，that不能引导非限制性定语从句；what不能引导定语从句．故选C．
点评 限制性定语从句是高中的重难点之一，考查考生对各种关系词的句法及意义的掌握，分析理解复杂的句子结构的能力，能够正确理解句子的语境．
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