单项选择题

（）means that a source program file can be compiled and executed on different computers.

A.Portability
B.Usablity
C.Recovery
D.Mobility

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More and more persons who use the Intemet had created a （） or web based diary.

A.blog
B.DBMS
C.profile
D.photo-set
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Unit testing refers to that each （）is tested to ensure that it operates correctly.

A.subsystem
B.device
C.application
D.module
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