题目内容
2．Humansare polluting（pollute） the earth all the time and there is not enough clean air and water．分析 人类一直在污染地球，现在没有了足够清洁的空气和水．
解答 答案：are polluting 提示词pollute，动词，污染．根据there is not enough clean air and water．现在没有了足够的清洁空气和水．再结合时间状语all the time，可知上文是说现在一直持续进行的动作．应该用现在进行时态．现在进行时态构成：am/is/are+doing，主语为复数humans，所以应用be动词are，pollute的现在分词为polluting，故填：are polluting．
点评 本题主要考查完成句子，首先要根据所给单词提示，然后根据句式特点，结合句意，词性，时态等，确定单词的适当形式，最后把句子补充完整．
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