单项选择题

If the cost of a long—distance phone call is c cents for the first minute and
cents for each additional minute，what is the cost，in cents．of a 10-minute call of this type？（）

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

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单项选择题

A school bus has 10 double seats in each of2 rows．Two students can sit in each double seat．If an empty bus starts out and makes two stops，picking up three times the number of students at the second stop as at the first stop，and if the bus is then filled to seating capacity，how many students got on the bus at the second stop？（）

A. 5
B. 10
C. 15
D. 20
E. 30

单项选择题

In a certain room，all except 18 of the people are over 50 years of age．If 15 of the people in the room are under 50 years of age，how many people are in the room？（）

A. 27
B. 30
C. 33
D. 36
E. It cannot be determined from theinformation given．

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