NO.PZ2015122801000063
问题如下：
Which of the following market indexes is least likely to be reviewed periodically to confirm that their constituent assets still meet the qualifications that to be included in the index? Instead, it needs to be reconstituted frequently. An index that is designed to measure:
选项：
A.the growth of commodity prices.
B.the returns of real estate.
C.the yields of commercial paper.
解释：
C is correct.
Because the constituent securities need to be replaced when they mature, an index of commercial paper yields needs to be reconstituted frequently. The other two indexes need to be reviewed periodically to confirm whether their constituent assets still meet the qualifications to stay in the index.
C是正确的。
本题考察的是指数在什么情况下需要重新构建。
首先，该题最重要的考点在最后半句（instead后面的话）前面的内容都是用来绕晕同学的，不需要考虑。
债券指数由于包含的债券可能会到期，一旦到期就需要移除原债券，添入新债券。而对于没有到期日的股票，大宗商品，及房地产，不存在因为到期而重新构建的问题。
C选项可以理解成是270天以内到期的一种短期企业发行的债券。有到期日并且很短的期限就会到期，所以需要经常被重新构建。选C。
大宗商品也是有合约期的，也存在着到期就要重构，如，原油
重构的频率可能还短于270天
