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    19．It is known to all that fresh air isbeneficialto our health and the new park benefits us all，so we should keep it clean．（benefit）

    分析 众所周知，新鲜的空气对我们的健康有益．而且新的公园对我们都有益，因此我们要保持它的清洁．

    解答 答案：beneficial
    解析：本题中that引导的是主语从句，而句首的It作形式主语；根据句意"新鲜空气对我们的健康有益"可知，本题考查be beneficial to"对…有益"这一固定短语．综上，本题答案为：beneficial．拓展：benefit from 意为"从…中受益"．

    点评 本题考查单词填空，做此类题目时一定要仔细分析句子结构，确定所缺成分；再结合所给的中英文提示及题干中其他要求填入正确单词．

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