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标题: 求助prep1-28~非常感谢！~ [打印本页]

作者: 水色青空 时间: 2010-4-20 20:24
标题: 求助prep1-28~非常感谢！~

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，我不明白的是C选项和E选项，麻烦NN分析下这两个选项把~~非常感谢！~~

作者: ellie78 时间: 2010-4-20 20:50
我选了B。等牛牛解答时我也搭个便车学习学习...

作者: skynova 时间: 2010-4-20 23:39
C中提到了proportion，但我们不知道这两年市场中用户的总量究竟是怎样的，因此这个proportion未知。

B和E 里的内容都是可能的解释，但似乎原文中的内容似乎都不能确定推出这两个？

作者: ms小刺 时间: 2010-5-1 21:11
这题第一次做错了，隔天看恍然大悟。。就说有两种顾客，一种挑便宜且利润低的麦，一种挑利润高但是性能强大的买，然后说今年这家公司利润上升了，但购买的总人数不变。---------------那不就说明那些专买利润高但性能强大的顾客比例大了么，也就是那部分专挑便宜买的顾客比例小了。。。这样说清楚不。。。。

作者: 水色青空 时间: 2010-5-5 15:52
perfect explanation!~THANK YOU!~

作者: 水色青空 时间: 2010-5-5 15:52
不知道ls的回复你是否明白了~不明白我们再讨论哦

作者: tylerwfj 时间: 2010-5-6 17:25
那么就是说这题的答案是选D么？

作者: lorolana 时间: 2011-4-5 23:25
文章已经说了边际利润不变，e再说成本降低是没有意义的，可能售价也降低了导致边际利润还是不变的……

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