4．Many people haven't realized the danger of environmentalpollution（pollute）．

分析 許多人還沒有意識到環(huán)境污染的危害．

解答 答案：pollution  考查單詞填空．根據(jù)句意許多人還沒有意識到環(huán)境污染的危害．要用名詞pollute是動詞，名詞是pollution．

點(diǎn)評 本題考查用所給單詞的適當(dāng)形式填空，首先要根據(jù)語境明確句意，然后再根據(jù)相關(guān)語法對所給單詞在形式上做出正確的變化．

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