单项选择题

Which of the following numbers is both a factor of 48 and a multiple of 6（）

A. 2
B. 8
C. 12
D. 16
E. 18

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单项选择题
Seven is equal to how many thirds of seven（）

A.
B. 1
C. 3
D. 7
E. 21
单项选择题
A positive integer with exactly two different divisors greater than 1 must be（）

A. a prime
B. an even integer
C. a multiple of 3
D. the square of a prime
E. the square of an odd integer
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