单项选择题

If the radius of a circular region were decreased by 20 percent, the area of the circular region would decrease by what percent（）

A. 16%
B. 20%
C. 36%
D. 40%
E. 44%

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单项选择题

If x+y=16, and if x2-y2=48, then x-y=（）

A. 3
B. 4
C. 6
D. 32
E. 36

单项选择题

Two buses are 515 miles apart. At 9:30 a. m., they start traveling toward each other at rates of 48 and 55 miles per hour. At what time will they pass each other（）

A、1:30 p.m
B、2:00 p.m
C、2:30 p.m
D、3:00 p.m
E、3:30 p. m

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