单选题 As stock prices plunged during the banking crisis, some investors were beginning to lose hope.
【正确答案】 A
【答案解析】该句意为：银行信贷危机中股票价格下跌，一些投资者开始心里没底。plunge的意思是“陷入，下跌，投入”。tumble：翻跟头，下降，跌落；disperse：驱散，散开；collapse：崩溃，解体，垮台；drip：滴入。