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14．This scientific experiment requires a great deal of _____．（　　）

A．

cencentration

B．

concentrate

C．

concentraion

D．

concentration

分析科學實驗需要非常地專心．

解答答案是D．本題考查單詞拼寫．A和C項拼寫錯誤；B項為動詞，表示"專心于；集中"；C項是名詞，表示"專心，集中"；根據句子結構，題干中需要的是名詞"專心"，所以答案選擇D項．

點評本題考查名詞詞義辨析，考生在平時的學習中應注意積累相應的詞匯和搭配，并牢記其意思．在做題時，將詞義和題干相結合，從語法、句子結構尤其是句意上去判斷，句意通順，符合邏輯，即正確答案．

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