October 24, 1929. Black Thursday. On this infamous day, the New York Stock Exchange was hit with chaos that quickly amounted to

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问题     October 24, 1929. Black Thursday. On this infamous day, the New York Stock Exchange was hit with chaos that quickly amounted to a 30% decline in the value of the Dow Jones Industrial Average, a benchmark index often used as a proxy in measuring the health of the American economy. This loss marked the end of the Roaring Twenties, a period of time in which many believed that the only direction for the stock market and the entire economy was up. Soon the U.S. entered into its longest and deepest economic slump, the Great Depression, and it took 25 years for the Dow Jones Industrial Average to return to its previous high.
    Few have personal memories of the 1929 crash, but the event still colors the play of cautious investors even today. In a matter of hours, thousands saw their fortunes sink,turning previous paper millionaires into destitute paupers. The illusion of easy money in the stock market for these people was shattered, replaced by a harsh reality that the fickle sentiments of the market determined the fate of their paper profits. As the value of shares in companies tumbled, so did consumer confidence, resulting in further irrational selling, causing prices to further plummet, creating a downward spiral of frenzied losses and panic.
    There were a few useful outcomes, however. Before the crash, security regulations were either lacking or rarely enforced, and stock brokers regularly hyped dubious firms. In 1934, after Congressional hearings on the problems, the Securities and Exchange Commission(SEC)was established to police Wall Street behavior and protect investors from fraud. Also, after 1929 many more economists and financial experts became interested in studying techniques for properly valuing stocks and giving advice on how to avoid financial panics. Their research has added to our knowledge about the economy and is at least partially responsible for the greater stability in many markets.
The author mentions the prosperity of the "Roaring Twenties" to______.

选项 A、stress the unexpected nature of the crash
B、explain the reasons for the crash
C、suggest a way to avoid future crashes
D、display an ideal situation

答案A

解析 属信息推断题。题目中的关键词Roaring Twenties出现在第一段第四句:这一次的损失意味着美国历史上繁荣的20年代走到了穷途末路,当时很多人相信股票市场只会持续牛市势头,整个美国经济只会保持上扬。显然,这句话是想说明“这次危机出乎很多人的意料”,而不是对它的原因解释(选项B),也不是提出如何避免未来危机的方法(选项C),更不是展示一个理想的情形(选项D)。因此,选项A为正确答案。
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