单项选择题

Common ping programs use ICMP's () messages to detect the reach ability of the target host. ( )
A、Send back requests and answers
B、Address mask requests and answers
C、Router inquiries and announcements
D、Timestamp Requests and Responses

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多项选择题

（多选）刑法规定在主观方面除了要有故意外，还以“明知”某项事实为要件的犯罪有( )。 A.
赌博罪 B.
窝藏、包庇罪 C.
拒绝提供间谍犯罪证据罪 D.
窝藏、转移、收购、销售赃物罪

主持人马东是哪位相声大师的儿子？

答案：正确答案：马季