8．Exercise is extremelybeneficial（benfit） to health．

分析 運(yùn)動對健康極為有益．

解答 beneficial考查形容詞的用法．根據(jù)副詞修飾形容詞，可知應(yīng)用benefit的形容詞形式；be beneficial to是固定搭配，意為"對…有益"，故填beneficial．

點(diǎn)評 形容詞是中學(xué)英語的重要語法，解題時首先要根據(jù)語境和邏輯來推斷出空所需要的詞性，或者是根據(jù)句子結(jié)構(gòu)的需要來推斷詞性，然后根據(jù)句意和所給的詞寫出正確答案．

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