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题库 / Prep2007E1-CR-28
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?
PXC's competitors raised the prices on their computers last year, making PXC computers more attractive to first-time computer buyers.
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.
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.
The proportion of PXC computers bought by first-time computer buyers was smaller last year than the previous year.
PXC's production costs for its computers were lower last year than they had been the previous year.
类比
已知：第一次买PXC的人比以旧换新PXC的花的少
去年PXC卖的电脑和以前一样多，价格、利润率也没有变，电脑本身的销售额（划重点！！）的利润却上涨了
增强，解释两年有什么不同
A、PXC对手价格上调（暗示PXC应该卖电脑更多），因此PXC吸引着第一次买电脑的人，吸引≠买，与利润无关
但从这个选项，可以得到小tip：
“已知：第一次买PXC的人比以旧换新PXC的花的少”也许是突破口
B、PXC电脑周边产品销量提升，与PXC电脑本身无关
C、以旧换新的人，买PXC对手的比率超过前几年，削弱
这个选项，tip又出现了！！
D、The proportion of PXC computers bought by first-time computer buyers was smaller last year than the previous year.
很漂亮的回答，CORRECT
E、生产成本降低，与销售额无关
这道还是很tricky的，处处都是坑
关于B，文中有提及边际效益也没有增加
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