20．Many businesses started up by college students have ________thanks to the comfortable climate for business creation．（　　）
A．fallen offB．taken offC．turned offD．left off

分析 句意：多虧了適合創(chuàng)業(yè)的舒適氣候（舒適的創(chuàng)業(yè)氛圍），很多由大學生創(chuàng)辦的企業(yè)迅速發(fā)展．

解答 答案B．"fall off"減少，下降；"take off"起飛，突然成功，開始迅速發(fā)展；"turn off"關(guān)掉；"leave off"停止，中斷．根據(jù)句意，多虧了適合創(chuàng)業(yè)的舒適氣候，很多由大學生創(chuàng)辦的企業(yè)"迅速發(fā)展"．故選B．

點評 本題考查的是動詞短語，要掌握短語的意思并結(jié)合具體的語境選擇出正確選項．

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