10．A good diet isbeneficialto health．良好的飲食有益于健康．

分析 beneficial

解答 答案：beneficial．
分析句子的意思及結(jié)構(gòu)可知，本句考查短語be beneficial to sb對某人有益，故答案為beneficial．

點評 做翻譯填空的題目要注意解題步驟：1．分析每道題目需要完成部分的語法屬性　2．劃出已給出部分的中心詞．依據(jù)空格前后成分，確定空格的語法屬性：詞性、單復數(shù)、時態(tài)等．

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