19．Many Europeans explored _______ continent of Africa in the 19th century with the determination to discover _______ unknown．（　　）
A．/； theB．the； anC．/； anD．the； the

分析 決心去發(fā)現(xiàn)新事物，許多歐洲人在19世紀(jì)探索了非洲大陸．

解答 The用在普通名詞和另外一些詞構(gòu)成的國家名稱、機(jī)關(guān)團(tuán)體、階級等專有名詞前．因此非洲大陸是（the continent of Africa）；the用在分詞前表示一類人或物或某種抽象概念，unknown為過去分詞，the unknown表示"未知的事物"．故選D．

點(diǎn)評 本題考查定冠詞the的用法．在熟知the用法的基礎(chǔ)上，從而得出正確答案．

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