题目内容
20．Friends of the Earth help keep theenvironment[?n?va?r?nm?nt]clean．分析 地球之友帮助保持环境的干净整洁．
解答 答案：environment，根据题Friends of the Earth help keep the[?n?va?r?nm?nt]clean．地球的朋友们帮助保持…的干净整洁．the后的空处应为名词，根据音标填单词environment，环境，所以答案是：environment．
点评 掌握单词的发音和音标是解题的关键．
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