单项选择题

Art，Bob，and Carmen share a prize of$400．If Art receives twice as much as Bob，and if Bob receives as much as Carmen，how much does Carmen receive？（）

A. $20
B. $40
C. $80
D. $140
E. $160

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单项选择题

The charge for a telephone call made at10:00 a．m．from city Y to city X is $0．50 for the first minute and $0.34 for each additional minute．At these rates，what is the difference between the total cost of three5-minute calls and the cost of one 15-minutecall？（）

A. $0.00
B. $0.16
C. $0.32
D. $0.48
E. $1.00

单项选择题

In a certain country，a person is born every3 seconds and a person dies every 10seconds．Therefore，the birth and death rates account for a population growth rate of one Person every（）

A.A
B.B
C.C
D.D
E.E

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