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單項選擇題

Dataitemsareaddedordeletedfromthelistonlyatthetopofthe（）.

A.queue
B.stack
C.tree
D.linearlist

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（）meansthataprogramwrittenforonecomputersystemcanbecompiledandrunonanothersystemwithlittleornomodification.

A.Portability
B.Reliability
C.Availability
D.Reusability

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（）hasbecomeafactofmodemlife，withmillionsofpeoplenowshoppingon-line.

A.E-mail
B.E-commerce
C.E-Iearning
D.E-communication

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