标题: OG11-21 解題思路 [打印本页] 作者: Kath1985 时间: 2010-4-11 14:22 标题: OG11-21 解題思路 Ruralhouseholds have more purchasing power than do urban of 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 ruralhouseholds for other needs.
(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. 答案B 請問這題的思路是什麼 呢 作者: hughlv 时间: 2010-4-11 19:01
lz忘了贴问题，应该是问assumption吧。关键就是看懂since后面的那部分话。不管urban还是rural的家庭都需要拿部分收入用于food和shelter，但是按作者的意思，就是urban家庭在这方面的费用比rural家庭要高，否则他就没法说some of the income urban households use for food can be used by rural households for other needs了。B直接就是这个意思，不需要推导。