NO.PZ2015121801000001
问题如下：
Investors should use a portfolio approach to:
选项：
A. reduce risk.
B. monitor risk.
C. eliminate risk.
解释：
A is correct.
Combining assets into a portfolio should reduce the portfolio’s volatility. Specifically, "individuals and institutions should hold portfolios to reduce risk." As illustrated in the reading, however, risk reduction may not be as great during a period of dramatic economic change.
题目做对了，也看了其他同学的提问及解析。 还是想问B为什么不对。解析中还是解释了因为A是正确的所以B不正确。但是还是没有回到到点子上。请单纯就B进行解答一下。谢谢。