单项选择题

What was the approximate percent increase in total medical^* expenditures from 1975to 1985（）

A. 44%
B. 77%
C. 85%
D. 88%
E. 135%

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单项选择题

Which of the following statements can be inferred from the graph（） Ⅰ School X has a smaller enrollment than School Y． ⅡIf the age of a book is the number of years since purchase，then the average(arithmetic mean)age of a book in the School Y inventory is less than that of a book in the School X inventory． Ⅲ According to the inventory，School X and School Y purchased the same number of textbooks in 1976．

A. None
B. Ⅰ only
C. Ⅱ only
D. Ⅰ and Ⅱ
E. Ⅱ and Ⅲ

单项选择题

Of the following 1980 median-income ratios，the greatest was the ratio of the median incomes of（）

A. graduates in Region Y to graduates in Region X
B. nongraduates in Region Y to nongraduates in Region X
C. graduates in Region Y to nongraduates in Region Y
D. graduates in Region X to nongraduates in Region X
E. graduates in Region X to nongraduates in Region Y

What was the approximate percent increase in total medical* expenditures from 1975to 1985（）

What was the approximate percent increase in total medical^* expenditures from 1975to 1985（）