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8.Exercise is extremelybeneficial(benfit) to health.

分析 运动对健康极为有益.

解答 beneficial考查形容词的用法.根据副词修饰形容词,可知应用benefit的形容词形式;be beneficial to是固定搭配,意为"对…有益",故填beneficial.

点评 形容词是中学英语的重要语法,解题时首先要根据语境和逻辑来推断出空所需要的词性,或者是根据句子结构的需要来推断词性,然后根据句意和所给的词写出正确答案.

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