单项选择题

Shadow play first appeared during the Western Han Dynasty.

A．more than 1,000 years ago
B．more than 2,000 years ago
C．more than 3,000 years ago
D．more than 4,000 years ago

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单项选择题

使用下面哪个命令可以在虚拟终端vty上设置访问控制列表( )
A、access-group 1 in
B、ip access-group 1 in
C、access-class 1 in
D、ip access-class 1 in

不定项选择

持有股票的同时买入看跌期权的策略被称为收益增加策略

A．正确
B．错误