听力原文:W:John,dinner is all ready and my parents have just arrived.Where are you? M:I'm sorry,Helen,but the meeting I'm attending won't be over for an hour.You should all go ahead and eat without me. Q:What do we learn from this conversation? (15)
A.
John was lying to his wife.
B.
John won't be able to come home for dinner.
C.
John will eat without meat.
D.
John was on the way home
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举一反三
【多选题】OSPF routing uses the concept of areas. What are the characteristics of OSPF areas? ()
A.
Each OSPF area requires a loopback interface to be configured.
B.
Areas may be assigned any number from 0 to 65535.
C.
Area 0 is called the backbone area.
D.
Hierarchical OSPF networks do not require multiple areas.
E.
Multiple OSPF areas must connect to area 0.
F.
Single area OSPF networks must be configured in area 1.