Rural households have more purchasing power than do urban or suburban households at the same income level, since some of the income urban and suburban households use for food and shelter can be used by rural households for other needs.

Which of the following inferences is best supported by the statement made above?

A. The average rural household includes more people than does the average urban or suburban household.

B. Rural households have lower food and housing costs than do either urban or suburban households.

C. Suburban households generally have more purchasing power than do either rural or urban households.

D. The median income of urban and suburban households is generally higher than that of rural households.

E. All three types of households spend more of their income on housing than on all other purchases combined.

A is not a supported inference, since there is no information to suggest that larger households are not more likely to have either more purchasing power or lower food and shelter expenses.

题目不难。B is the best answer. 但我不明白关于A地解释，我认为说反了。请指点！thx！

请问花在房子和食物上的钱不算作购买力的一部分吗？

1.ets says that the passage does not describe anything about the scale of rural family.

2.we should focus the same income that has different purchasing power between rural household and urban household because rural household pay less for food and shelter.so,rural household can use the same total income to purchase more than urban household,and rural household has a higher purchasing power.

A is not a supported inference, since there is no information to suggest that larger households are not more likely to have either more purchasing power or lower food and shelter expenses.

A的解释说的是rural家庭的平均人数比urban or suburban的家庭多，原题目中没有任何信息表明大家庭的购买力就比小家庭的强或者弱。我想这是since there is no information to suggest that larger households are not more likely to have either more purchasing power or lower food and shelter expenses这段话的意思。A属于典型的无关选项。我这么理解的，不对的地方，请方家斧正。

since there is no information to suggest that larger households are not more likely to have either more purchasing power or lower food and shelter expenses

这句话是双重否定吗？怎么看不懂？请xdjm帮忙翻译一下，谢谢！

翻译是:

没有信息表明:较大的家庭有可能具有比较强的购买力或较低的花费在食品和住处上.

我觉得A是无关选项。

因为人多人少与购买力是无关的,从文中不能得出他们是有关联的。

所以A不对。