单项选择题

3×10⁴ is greater than 4×10³ by what percent（）

A. 25%
B. 75%
C.
D. 650%
E. 750%

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单项选择题

If n is any prime number greater than 2，which of the following CANNOT be a prime number（）

A. n-4
B. n-3
C. n-1
D. n+2
E. n+5

单项选择题

How many positive whole numbers less than 81 are NOT equal squares of whole numbers（）

A. 9
B. 70
C. 71
D. 72
E. 73

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