单项选择题

For which of the following pairs of integers is the least common multiple of the integers minus their greatest common divisor the greatest（）

A. 3，12
B. 5，6
C. 10，20
D. 11，12
E. 15，30

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单项选择题
If n=pqr，where P，q，and r are three different positive prime numbers，how many different positive divisors does n have．including 1 and n（）

A. 3
B. 5
C. 6
D. 7
E. 8
单项选择题
Of the following，which is most nearly equal to （）

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