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问题 单项选择题

（）是由早先形成的岩石由于后来地质环境和物理化学条件的变化其结构构造和化学成份也发生变化而形成的一种新的岩石类型。

A.变质岩

B.储集岩

C.火成岩

D.沉积岩

答案

参考答案：A

单项选择题

At a recent seminar on Capital Market Efficiency, David Thorngate, a seasoned arbitrageur wanted to dispel the notion that all arbitrage trades are successful. During his speech, he made the following statements regarding arbitrage and the ability of arbitrageurs to correct market anomalies: Statement 1: There are limits on the ability of arbitrage to bring about efficient prices. Arbitrage is frequently not risk-less. Just because fundamentals indicate that one stock is undervalued or overvalued relative to another does not mean that trading on this information will be profitable. Statement 2: Even in "pairs trading," where an arbitrageur buys the underpriced security and shorts the overpriced security, significant risk from stock-specific factors remains. So, there is no guarantee that even correctly identified relative mispricings of similar stocks will be corrected in the near term. Are Statement 1 and Statement 2 as made by Thorngate correctStatement 1 Statement 2（）①A. CorrectCorrect ②B. Incorrect Incorrect ③C. CorrectIncorrect

A. ①

B. ②

C. ③
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填空题

羊的发情季节在（）。
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