16．After working hard for many years，Jim became the CEO of a company in hisfifties （fifty）．

分析 多年的辛苦工作后，五十多歲的吉姆成為一個(gè)公司的CEO．

解答 答案：fifties
聯(lián)系語(yǔ)境，根據(jù)關(guān)鍵詞 in his…聯(lián)系后面的提示詞fifty為基數(shù)詞"五十"，所以聯(lián)想到表示年齡段的固定短語(yǔ)in one's+基數(shù)詞的復(fù)數(shù)形式，意為"在某人幾十多歲的時(shí)候"；所以此處應(yīng)用fifty的復(fù)數(shù)形式fifties，in his fifties意為：在他五十多歲的時(shí)候（成為一個(gè)公司的CEO），符合意義及用法．故填：fifties．

點(diǎn)評(píng) 此題考查數(shù)詞的變化形式．做題時(shí)聯(lián)系關(guān)鍵部分結(jié)合語(yǔ)境利用已掌握的詞匯知識(shí)確定出正確的固定表達(dá)．

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