烟草专卖零售许可证的持证人在零售许可证有效期届满后需要继续从事烟草专卖零售业务的，应当在许可证有效期届满前（）日前向原发证机关提出延续申请。
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封开，古称封川，是广东主要方言粤语的发源地。
A. 正确
B. 错误
楼房里走下来一只黑色的巨大怪物，他先把（）吃掉了。
A. 船长
B. 辛巴达
C. 羊
What is the purpose of this command? ip route 0.0.0.0 0.0.0.0 serial0/0（）
A. It configures a router to send all packets out interface serial 0/0.
B. It configures a router to block routing updates from being sent out interface serial 0/0.
C. It configures a router as a firewall, blocking all unauthorized packets from exiting serial 0/0.
D. It configures a router to send all packets for unknown destination networks out interface serial 0/0.
E. It configures a router to drop all packets for which the destination network is unknown.
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