单项选择题

For how many positive integers m ≤ 100 is (m -5)(m -45) positive（）

A. 45
B. 50
C. 58
D. 59
E. 60

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单项选择题
（）

A.A
B.B
C.C
D.D
E.E
单项选择题
If the total enrollment in institutions of higher education in 1972 was 5,000,000. approximately how many students were enrolled in private 4-year institutions in 1995（）

A. 1,000,000
B. 1,100,000
C. 1,250,000
D. 1,500,000
E. 1,650,000
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