【題目】根據(jù)句子意思,用括號中所給詞的正確形式填空,每空填一詞。
Humans (pollute) the earth all the time and there is not enough clean air and water.

【答案】are polluting
【解析】句意:人類一直在污染環(huán)境,沒有足夠干凈的空氣和水。根據(jù)there is可知,這里敘述的是現(xiàn)在的情況,根據(jù)all the time可知,這里表示污染正在進(jìn)行。所以答案是:are polluting。

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