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

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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

单项选择题

In 1974 the dollar value of imports was approximately what percent of the dollar value of exports（）

A. 4%
B. 17%
C. 27%
D. 79%
E. 367%