自測(cè)試題二（8）

25.Excluding purchases by businesses， the average
    amount spent on a factory-new car has risen 30 per-
    cent in the last five years. In the average 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 of the following is an assumption on which
    the argument relies？
    （A）The average number of factory-new cars pur-
    chased per household has remained unchanged
    over the last five years.
    （B）The average amount spent per car by businesses
    buying factory-new cars has risen 30 percent in
    the last five years.
    （C）The proportion of the average household budget
    spent on all car-related expenses has remained
    unchanged over the last five years.
    （D）The proportion of the average household budget
    spent on food and housing has remained
    unchanged over the last five years.
    （E）The total amount spent nationwide on factory-
    new cars has increased by 30 percent over the
    last five years.