If a and b are odd integers, which of the following is an even integer?

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问题 If a and b are odd integers, which of the following is an even integer?

选项 A、a(b-4)
B、ab+4
C、(a+2)(b-4)
D、3a+5b
E、a(a+6)

答案D

解析 a为奇数，则3a亦为奇数，b为奇数，则5b也为奇数，奇数+奇数=偶数，所以选择D。

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