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[问答] 问一道陈虎平逻辑10套里的一题 [复制链接]

altera
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电梯直达

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发表于 2012-2-17 20:06:06 |只看该作者 |倒序浏览

陈虎平逻辑10套里 test1,13题：Excluding purchase by business，the average amount spent on factory-new car has risen 30 percent in the last five years. In the avrage household budget,the proportion spent on car purchases has remained unchanged in that period.Therefore the average household budget must have increased by 30 percent over the last five years.

Which ist he following is an assumpution on which the argument relies?

(A)The average number of factory-new cars purchased per household has remained unchanged over the past five years.
(B)The average amount spent per car by business buying factory-new car has risen 30 percent in the last five years.
(C)The proportion of the average household budget spent on car-related expense has remained unchanged over the last five years.
(D)The proportion of the average household budget spent on food an housing has remained unchanged over the last five years.
(E)The total amount spend nationwide on factor-new cars has increased by 30 percent over the last five years.

答案给的是A，我开始选的B。谁能给我讲解一下A为什么是对的，B错在哪里？

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苏梳眠
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沙发

发表于 2012-2-17 20:31:47 |只看该作者

前提是每个家庭购车资金在household budget 中保持不变，论据是平均购车费用增加30%，结论是平均household budget增加30%。
这之间有个关键点，就是购车资金在household budget 中保持不变，但是购车资金不仅与平均购车费用有关，而且与购车数量有关，这样才能实现30%的放大。所以A正确。
B是讲business的，和这个题目无关。

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altera
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板凳

发表于 2012-2-17 20:42:25 |只看该作者

2# 苏梳眠
多谢版大回答，可是我仍然不明白
In the avrage household budget,the proportion spent on car purchases has remained unchanged in that period.意思不就是说 “每个家庭购车资金在household budget 中保持不变”吗？我是看到这一句话首先排除和私人家庭买车有关的所有选项。。。。

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苏梳眠
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地板

发表于 2012-2-17 20:47:30 |只看该作者

本帖最后由苏梳眠于 2012-2-17 20:50 编辑

2# 苏梳眠
多谢版大回答，可是我仍然不明白
In the avrage household budget,the proportion spent on car purchases has remained unchanged in that period.意思不就是说 “每个家庭购车资金在household budg ...
altera 发表于 2012-2-17 20:42

找assumption，就是上面原因到结果间默认的话，可推导出来的话~
你再琢磨琢磨~

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