题目内容
20．空气污染会更糟糕，除非我们采取行动来保护环境．The air pollution will be worse，unless wetakeactionto protect the environment．
分析 take action
解答 答案：take action
通过对比中英文句子，可知英文句子中缺失"采取行动"的表达，应用固定短语take action；此句为unless引导的条件状语从句，主句用了一般将来时，从句应该用一般现在时表将来，称为"主将从现"；从句的主语为复数are，所以动词take在一般现在时中用原形即可．故填写：take action
点评 此题考查固定短语的表达．做题时先确定好要填入的正确短语，再结合句子类型确定出时态，从而填入正确的答案，尤其注意动词的变化．
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