单项选择题

For which of the following lists of number is the median equal to the average(arithmetic mean)（）

A. 3，4，7
B. 1，10，19
C. 7，7，10，12
D. 0，1，1，5
E. 0，2，3，4

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单项选择题
If one number is chosen at random from the first 1，000 positive integers，what is the probability that the number chosen is multiple of both 2 and 8（）

A.A
B.B
C.C
D.D
E.E
单项选择题
In a series of races，10 toy cars are raced，2cars at a time．If each car must race each of the other cars exactly twice，how many races must be held（）

A. 40
B. 90
C. 100
D. 180
E. 200
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