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【单选题】
下列有关虚拟专网的叙述中错误的是( )。A.
构建虚拟专网需租用电信局的专线来实现端到端的物理连接
B.
隧道技术、加密、身份鉴别等是实现虚拟专网常用的技术
C.
虚拟专网是架构在公用骨干网所提供的网络平台之上的逻辑网络
D.
基于因特网的VPN具有节省费用、运行灵活、易于扩展、易于管理等优点
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【简答题】It is often said that ______ teachers have ______ very easy life. A) /, / B) /, a C) the, / D) the, a
【简答题】Good teachers often encouragetheir students to think for themselves.
【单选题】—My teachers often encourage me ________ more friends but I find it difficult. —Your teachers’ idea is right. The more friends you make, ________ you will be.
A.
to make; the more happy
B.
to make; happier
C.
making; the happier
D.
to make; the happier
【简答题】It is often said that __________ teachers have __________ very easy life. A. 不填；不填 B. 不填； a C. the, 不填 D. the, a
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