单项选择题

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单项选择题
A.0~255 B.1~256 C.0~511 D.1~512
A.0~255
B.1~256
C.0~511
D.1~512
单项选择题
A. memory B. caehes C. ports D. registers
As administrators seek to block dangerous email attachments through the recognition of well- known (69) , virus writers use other extensions to circumvent such protection. Executable (.exe) files are renamed to . bat and . cnd plus a whole list of other extensions and will still run and successfully infect target users. Frequently, hackers try to penetrate networks by sending an attachment that looks like a flash movie, which, while displaying some cute animation, simultaneously runs commands in the background to steal your passwords and give the (70) access to your network.
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