[求助]

In January there was a large drop in the number of new houses sold, because interest rates for mortgages were falling and many consumers were waiting to see how low the rates would go. This large sales drop was accompanied by a sharp rise in the average price of new houses sold.
Which of the following, if true, best explains the sharp rise in the average price of new houses?
(A) Sales of higher-priced houses were unaffected by the sales drop because their purchasers have fewer constraints limiting the total amount they pay.
(B) Labor agreements of builders with construction unions are not due to expire until the next January.
(C) The prices of new houses have been rising slowly over the past three years because there is an increasing shortage of housing.
(D) There was a greater amount of moderate-priced housing available for resale by owners during January than in the preceding three months.
(E) Interest rates for home mortgages are expected to rise sharply later in the year if predictions of increased business activity in general prove to be accurate.

答案是a，题目说卖房子的数量减少了，但是平均价格升高了。c说因为新房子的价格升高了。这样就能解释价格升高的原因了。为什么不可以阿。

自己顶一个 5555

因为贷款利率升了 所以新房的销售量少了

但是 新房的平均售价大幅提高了

问如何解释? 那么在答题之前就可以运用数学知识大致判断一下:肯定是在所卖的新房中高价房多了.

A符合这个判断, C只是说过去三年价格上涨了,不能就此证明今年也涨了,何况C价格上涨的原因是increasing shortage of housing,而题中已经告诉大家人们都在观望,销售量是减少了.

C里面说：过去的三年，发生了价格的缓慢增长。就算这个趋势延续到现在，C只能解释一月份价格的缓慢增长。但题干说，今年一月份的平均价格是sharp increase，C是解释不了的。

A是对的，平均价格和总销量无关，是由销售出去的房子的贵贱比例决定的。A说贵的房子的购买者较少受房子总价的影响，（我觉得就是他们可以直接付款，不用贷款，所以不受利率影响）。既然贵房子的销售一如既往，而便宜房子的销售大大减少，那平均价格就上升了。

用自己的话说一遍：题目说一月的时候新房销售量降低了很多。据说是抵押税的降低，于是人们在观望。但是新房的平均售价上升了。（同意phil的，销售量和平均价格其实是没什么关系的）本来销售量就降低了，a说贵的没变，可不就是平均价格上升了么。