【題目】Don't throw litter about. We must protect the e.

【答案】environment
【解析】句意:別亂扔垃圾,我們必須保護環(huán)境。由句意和首字母提示可知考查environment,環(huán)境,抽象名詞,不可數(shù),所以答案是environment。

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