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答案：
A
问k和j最
条件一 k=j+1 说明k永远比j大一 换句话就是说 如果k可以被任意一个除1外的数整除，那么j除以这个数就一定余1 所以说明能够被k和j同时整除的数只有1，也就是只有1为其相同的因子
条件二 kj可以被5整除，说明k或j中有一个数可以被5整除，另外一个不确定。例如 k=5 j=2 或 k=5 j=10 都符合题意 但kj最大的相同因子却无法确定
所以 选A
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