单项选择题
What is the least prime number greater than 83?()
A. 85
B. 87
C. 88
D. 89
E. 91
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单项选择题
If p and r are prime numbers,which of the following must also be prime()
A. pr
B. p+r
C. pr+1
D. p
2
+r
2
E. None of the above
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