题目内容
根据中文意义完成下列句子(每空一词)
种了许多树木,一来是可以保持空气清新,二来,可以使城镇看起来更漂亮。
More trees must be planted _____ ______ ______ they keep air fresh, ______ ______ they make towns and cities look more beautiful.
答案:for, one, thing, for, another
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