Many Americans believe that ______.
A.sleep is the first thing that can be sacrificed when one is busy
B.they need more sleep to cope with the complexities of everyday life
C.to sleep is something one can do at any time of the day
D.enough sleep promotes people's drive and ambition
第8题
下面______不是Internet网络管理协议。
A.SNMPv1
B.SNMPV2
C.SNMPv3
D.SNMPv4
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