20．As a general rule，it's important to ______ between effectiveness and absolute time commitments．（　�。�
A．acknowledgeB．differentiateC．confirmD．justify

分析 一般說來，區(qū)別有效性和絕對的時間投入很重要．

解答 答案是B．本題考查動詞詞義辨析．A項表示"承認(rèn)，致謝"；B項表示"區(qū)別"，differentiate between A and B 區(qū)別A和B；C項表示"證實"；D項表示"證明…有理"；根據(jù)句意和搭配判斷，答案選擇B項，其它選項不符合邏輯．

點評 本題考查動詞詞義辨析，考生在平時的學(xué)習(xí)中應(yīng)注意積累相應(yīng)的詞匯和搭配，并牢記其意思．在做題時，將詞義和題干相結(jié)合，從語法、句子結(jié)構(gòu)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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