问一道陈虎平逻辑10套里的一题

alteraUID: 2724954

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？

苏梳眠UID: 2717864

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。

alteraUID: 2724954

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。。。。

苏梳眠UID: 2717864

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~

米兰啸西风UID: 3136730

4# 苏梳眠

请教版主，为什么是每户的汽车数是不变的呢？要使购车费用提高30%，不是应该增加每户汽车数或者提高汽车价格吗？

alteraUID: 2724954

4# 苏梳眠
无果。。依旧不了解，5555555

苏梳眠UID: 2717864

4# 苏梳眠  

请教版主，为什么是每户的汽车数是不变的呢？要使购车费用提高30%，不是应该增加每户汽车数或者提高汽车价格吗？
米兰啸西风 发表于 2012-2-17 21:22

但是结论是提高household budget~
从average购车费用增加，到相应的household budget增加，这两者是同为30%的增长率，所以之间的系数，购车数量是不变的。

米兰啸西风UID: 3136730

7# 苏梳眠
啊，原来如此，题干一句话理解错了。谢谢版主

alteraUID: 2724954

7# 苏梳眠
懂了~！原来average amount spend on factory-new car的意思是 平均购车（即一辆车）的价格呀，对不对？一辆车 是通过average得来的吗？

zhj0735UID: 2561218

请问楼主，assumption是由题干推断到的假设呢？还是验证假设的？
2# 苏梳眠