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13.It is known to all that fresh air isbeneficial(有益的) to our health.

分析 众所周知,新鲜的空气对我们的健康有益.

解答 答案是beneficial.本题考查语境中选用恰当的词的适当形式.beneficial adj.有益的;be 动词is 后面需要的是形容词,be beneficial to 对…有益的,故答案是beneficial.

点评 翻译填空要根据所提供的汉语意思结合语境和句子结构选择恰当的词、短语或句型;同时注意句子结构和所选词的形式变化.

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