VLAN（虚拟局域网）是一种将局域网从（），而不是从（），从而实现虚拟工作组的新兴数据交换技术。
参考答案：逻辑上划分网段，物理上划分网段
—Why are you standing there, Kangkang?
—I can’t see the blackboard clearly. Two tall boys are sitting _________ me.
A. behind B. next to C. in front of
James denounced sorcery, adultery, ______, incest, extortion, and murder; he would not eat prepared food, which he said was unclean, and stopped drinking milk.
A. monogamy B. monologue C. polygamy D. polygene
