（一）brHigh-see traing firms-the lightening-qu

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（一）
High-speed trading firms-the lightening-quick, computerized companies that have risen in the last decade to dominate the nations stock market -are now struggling to hold onto $1.25 billion this year, down 35 percent from last year and 74 percent from the peak of a year ago, according to estimates from the brokerage firm Rosenblatt Securities.  
While no official data is available about the employment at the high-speed firms, interviews with more than a dozen industry participants suggest that firms large and small have been cutting staff, and in some cases have shut down. The firms also account for a declining percentage of a shrinking pool of stock trading, from 61 percent three years ago to 51 percent now.
It is a swift reversal for trading firms that have often looked like profit machines in the eyes of other investors, thanks to high-powered software and super fast data connections that can take advantage of small changes in the price of a stock. High-speed trading is far from disappearing from the market, but the struggles facing these firms are welcomed by some traditional traders and investors who have viewed the firms as formidable rivals, or worse, market manipulators that create sudden increases and drops in share prices. Peter Costa, a longtime trader on the floor of the New York Stock Exchange, said the fading presence of the firms could "restore some order to stock markets".
Regulators are still trying to understand whether the rise of high-speed firms has been net benefit or loss for investors, so it is hard to say how the decline of these firms will affect the markets. Many market experts have argued that the technical problems that have recently hit trading services and a lack of human oversight.

答案

根据首段描述可知高频交易公司，指最近十年涌现出的高速、智能化的公司，曾主导着国家的股票市场，而现在它们却奋力挣扎着守住盈利之势。从一年前的74%下跌到去年的35%。选项A：高频交易公司的力量在于计算机化，表述片面；选项B：高频交易公司的利润近几年在下跌，表述正确；选项C：所有高频交易公司利益不再可观，表述极端；选项D：每一个高频交易公司都比传统贸易公司更正前，表述极端。故正确答案是选项B。

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