7．Columbus's discovery of the"New World"took place _______．（　　）
A．on purposeB．by accidentC．by heartD．by mistake

分析 哥倫布偶然發(fā)現(xiàn)了新大陸．

解答 答案：B 考查介詞短語(yǔ)．on purpose有目地的，故意地；by accident偶然； by design故意地； by mistake錯(cuò)誤地．根據(jù)句意，B項(xiàng)正確．

點(diǎn)評(píng) 考查介詞短語(yǔ)，弄清楚各個(gè)介詞短語(yǔ)的含義并區(qū)別各個(gè)介詞短語(yǔ)之間的差異，了解某些介詞短語(yǔ)的特殊用法，然后結(jié)合語(yǔ)境選擇正確答案．

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