20．Bill Gates is one of the wealthiest（最富有的） persons in the world and devotes himself to helping people in trouble．

分析 比爾•蓋茨是世界上最富有的人之一，他致力于幫助處于困境中的人們．

解答 wealthiest 考查形容詞的最高級(jí)．根據(jù)所給的漢語(yǔ)提示"最富有的"和空前的定冠詞the及句意可知，此處應(yīng)用形容詞的最高級(jí)形式，故填wealthiest．

點(diǎn)評(píng) 形容詞是中學(xué)英語(yǔ)的重要語(yǔ)法，解題時(shí)首先要根據(jù)語(yǔ)境和邏輯來(lái)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(lái)推斷詞性，然后根據(jù)句意和所給的漢語(yǔ)提示選出答案．

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