单项选择题

Dataitemsareaddedordeletedfromthelistonlyatthetopofthe（）.

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

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单项选择题
（）meansthataprogramwrittenforonecomputersystemcanbecompiledandrunonanothersystemwithlittleornomodification.

A.Portability
B.Reliability
C.Availability
D.Reusability
单项选择题
（）hasbecomeafactofmodemlife，withmillionsofpeoplenowshoppingon-line.

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