题目内容
11．The water in rivers is even_________ than before．Something must be done now．（ ）| A． | dirty | B． | dirtier | C． | more dirty | D． | dirtiest |
分析 小河里的水比甚至比以前更脏了，现在必须要做一些事情了．
解答 答案：B 根据关键词than可知，这是"现在的河水和以前的"两者之间的比较，应该用比较级形式；又根据even+形容词或副词的比较级，此处表示"更…"，此处意思是"更脏"，形容词dirty的比较级是dirtier，故选B．
点评 注意英语中有些词用来修饰形容词或副词的比较级形式，这些词有much/a little/even/far/a lot等．
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