单项选择题

What is the total number of different 5-digitnumbers that contain all of the digits 2，3，4，7 and 9 and in which none of the odd digits occur next to each other（）

A. 12
B. 10
C. 8
D. 6
E. 1

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单项选择题
For which of the following sets of numbers is the product of the three numbers less than each member of the set（）

A.a
B.b
C.c
D.d
E.e
单项选择题
One integer will be randomly selected from the integers 11 to 60，inclusive．What is the probability that the selected integer will be a perfect square or a perfect cube（）

A. 0.1
B. 0.125
C. 0.16
D. 0.5
E. 0.9
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