[单选题] Windows 2000 is().

1、[多选题]A virus is a program that reproduces its own code by().

• A、inserting into the middle of a file
• B、adding to the end of a file
• C、simply placing a pointer
• D、replacing another program

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2、[多选题]According to the physical size of computers we can classify the computers into

• A、minicomputer
• B、microcompute
• C、mainframe
• D、supercomputer

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3、[多选题]What make it is difficult to agree on how to count viruses?

• A、new virus arise from an existing virus
• B、some viruses can use polymorphic technique
• C、just a trivial change may creaｔe a new virus
• D、some viruses can creaｔe different versions when they infect other programs

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4、[多选题]The World Wide Web also subsumes previous Internet information s ystems such as().

• A、Gopher
• B、Telnet
• C、Ftp
• D、FTP

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5、[多选题]Instruction format in RISC has

• A、many kinds
• B、one or a few kinds
• C、one kind
• D、a few kinds

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