One of the serious weakness in American economy in the 1920s was

One of the serious weakness in American economy in the 1920s was _______.
A、uncontrolled speculation in stock market
B、tariff protection
C、huge profits of big business
D、too much control over the banking system
【正确答案】：A
【题目解析】：20世纪20年代美国经济的严重弱点之一是股票市场的不受控制的投机。