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【题目】根据句子意思,用括号中所给词的正确形式填空,每空填一词。
Humans (pollute) the earth all the time and there is not enough clean air and water.

【答案】are polluting
【解析】句意:人类一直在污染环境,没有足够干净的空气和水。根据there is可知,这里叙述的是现在的情况,根据all the time可知,这里表示污染正在进行。所以答案是:are polluting。

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