问题如下图：
选项：
A. 
B. 
C. 
解释：
请问这题考的知识点是什么呀，该怎么理解题目意思呢
NO.PZ2015122801000063问题如下Whiof the following market inxes is least likely to revieweperiocally to confirm ththeir constituent assets still meet the qualifications thto incluin the inx? Instea it nee to reconstitutefrequently. inx this signeto measure:A.the growth of commoty prices.B.the returns of reestate.C.the yiel of commercipaper. C is correct.Because the constituent securities neeto replacewhen they mature, inx of commercipaper yiel nee to reconstitutefrequently. The other two inxes neeto revieweperiocally to confirm whether their constituent assets still meet the qualifications to stin the inx.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（instea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frequently 和 peiroy矫正的区别是
NO.PZ2015122801000063问题如下Whiof the following market inxes is least likely to revieweperiocally to confirm ththeir constituent assets still meet the qualifications thto incluin the inx? Instea it nee to reconstitutefrequently. inx this signeto measure:A.the growth of commoty prices.B.the returns of reestate.C.the yiel of commercipaper. C is correct.Because the constituent securities neeto replacewhen they mature, inx of commercipaper yiel nee to reconstitutefrequently. The other two inxes neeto revieweperiocally to confirm whether their constituent assets still meet the qualifications to stin the inx.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（instea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。选求教，因为看到题干中说选择least likely，所以考虑不需要经常重新调整构成的。大宗商品价格经常波动或者某种商品不符合要求了，可能需要及时调整；短票因为涉及到期，也需要调整，而房地产不会在短期波动很大，所以无需调整。考虑上述，我选择的是reestate，但与题目中instea面的话又有些矛盾，请问老师此处应该如何把题干分解清楚呢，谢谢！
NO.PZ2015122801000063 问题如下 Whiof the following market inxes is least likely to revieweperiocally to confirm ththeir constituent assets still meet the qualifications thto incluin the inx? Instea it nee to reconstitutefrequently. inx this signeto measure: A.the growth of commoty prices. B.the returns of reestate. C.the yiel of commercipaper. C is correct.Because the constituent securities neeto replacewhen they mature, inx of commercipaper yiel nee to reconstitutefrequently. The other two inxes neeto revieweperiocally to confirm whether their constituent assets still meet the qualifications to stin the inx.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（instea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 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
NO.PZ2015122801000063 问题如下 Whiof the following market inxes is least likely to revieweperiocally to confirm ththeir constituent assets still meet the qualifications thto incluin the inx? Instea it nee to reconstitutefrequently. inx this signeto measure: A.the growth of commoty prices. B.the returns of reestate. C.the yiel of commercipaper. C is correct.Because the constituent securities neeto replacewhen they mature, inx of commercipaper yiel nee to reconstitutefrequently. The other two inxes neeto revieweperiocally to confirm whether their constituent assets still meet the qualifications to stin the inx.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（instea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 听课质量差，感觉题和讲课不是一回事，怎么办？
NO.PZ2015122801000063 债券指数为什么不需要定期审查成分资产？是因为它没有成分吗？另外为什么商业票据可以被看成是债券指数？
