单项选择题

Seven is equal to how many thirds of seven（）

A.
B. 1
C. 3
D. 7
E. 21

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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
单项选择题
Of the following．which is closest to（）

A. 1
B. 10
C. 70
D. 100
E. 700
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