5．As its economy is maturing，China's           a greater role in critical issues like climate and development．（　　）
A．definingB．assumingC．guaranteeingD．assuring

分析 隨著經(jīng)濟(jì)的成熟，中國在一些像天氣和發(fā)展這些關(guān)鍵問題上承擔(dān)了越來越大的作用．

解答 答案是B．本題考查動(dòng)詞詞義辨析．A項(xiàng)表示"下定義"；B項(xiàng)表示"假設(shè)，承擔(dān)"；assume the role of 承擔(dān)…作用；C項(xiàng)表示"保證"；D項(xiàng)表示"向…保證"；根據(jù)句意判斷，答案選擇B項(xiàng)，其它選項(xiàng)不符合邏輯．

點(diǎn)評 本題考查動(dòng)詞詞義辨析，考生在平時(shí)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(shí)，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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