是B 不是A 看1 m=3a 当a=1 a=2 m分别为3 6 又奇又偶！ 不能回答is m an even integer
看2 不管b取什么 都为奇数， 所以可以回答m不是不是偶数！！
注意：题干问is m an even integer 只是让你确定是否可以明确回答这个问题 ， m 是奇数偶数都可以，只要能回答就行，所以b充分...
请问一道GMAT数学题有一题 Is m an even integer? (1)m=3a,for some intege
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