单项选择题



*All references to homes in the data and test questions should be interpreted as one—family homes．
Note：Graphs drawn to scale．

In 1977 the number of existing homes sold was approximately how many times the number of new homes sold（）

A. 3
B. 3.5
C. 4.5
D. 5.5
E. 6

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单项选择题
For which age—group was the percent of households with discretionary income most nearly equal to 。（）

A. 15 to 24
B. 25 to 29
C. 40 to 44
D. 60 to 64
E. 70 and older
单项选择题
If the population of the United States was approximately 2.5×108 in 1989，what was the approximate total health expenditure．in d01lars．for the United States that year（）

A. 3×108
B. 6×108
C. 5×1010
D. 4×1011
E. 6×1011
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