[多选题] GIS work with two fundamentally different types of geographic mod els.They are the＿＿＿＿＿＿＿＿＿＿＿＿＿＿.

1、[多选题]Viruses can delay their attack for().

• A、months
• B、weeks
• C、days
• D、years

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2、[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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3、[多选题]A program is a sequence of＿＿＿＿＿＿＿＿that can be eｘecuted by a computer.It can either be built into the hardware or exist inde pendently in the form of＿＿＿＿＿＿＿＿.

• A、data
• B、hardware
• C、instructions
• D、software

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4、[多选题]The tools which Programming software usually provides include:

• A、text editors
• B、linkers
• C、interpreters
• D、debuggers
• E、compilers

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5、[多选题]The three desiderata of memory system are

• A、closely approximated today
• B、Less approximated tomorrow
• C、exclusive
• D、independent

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