[求助]再问prep1-28

jessica_cxy

28.   (31510-!-item-!-188;#058&004526)

 

First-time computer buyers buying PXC home computers typically buy models that cost much less and have a smaller profit margin per computer than do PXC computers bought by people replacing their computers with more powerful models.  Last year PXC's profits from computer sales were substantially higher than the previous year, although about the same number of PXC computers were sold and the prices and profit margins for each computer model that PXC sells remained unchanged.

 

If the statements above are true, which of the following is most strongly supported by them?

 

(A) PXC's competitors raised the prices on their computers last year, making PXC computers more attractive to first-time computer buyers.

(B) The number of people buying PXC computers who also bought PXC computer-related products, such as printers, was larger last year than the previous year.

(C) Among computer buyers who bought a PXC computer to replace their existing computer, the proportion who were replacing a computer made by a competitor of PXC was greater last year than the previous year.

(D) The proportion of PXC computers bought by first-time computer buyers was smaller last year than the previous year.

(E) PXC's production costs for its computers were lower last year than they had been the previous year.

D是正确答案，我能理解，但是我觉得C也对阿!

请教NN！

babee2queen

C只讨论了买PXC替换原有computer的群体，这个群体中换掉的原机器是PXC的比例对profit是没有贡献的。

jessica_cxy

First-time computer buyers buying PXC home computers typically buy models that cost much less and have a smaller profit margin per computer than do PXC computers bought by people replacing their computers with more powerful models.

请问LS MM这句话不是提到：换机器而买PXC的利润么？还是偶的理解有问题？。。。

babee2queen

First-time computer buyers买PXC的时候的确是有很小的profit margin per computer

但是题目中的profit增长说的是last year的

他们曾经买PXC贡献的profit对去年的增长是没有意义的。（也不可能认为他们在去年买了PXC的电脑然后在同一年又replace掉了……）