If x is an even integer, which of the following is an odd integer?

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问题 If x is an even integer, which of the following is an odd integer?

选项 A、3x+2
B、7x
C、8x+5
D、x²
E、x³

答案C

解析 x是偶数，那么x和任意多个数相乘乘积还是偶数。所以B，D，E都是偶数。A中3x+2是偶数加偶数还是偶数，C中8x+5是偶数加奇数，和为奇数。C为正确答案。

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