单项选择题

（）system let you run more than one program at a time.

A.Application
B.Software
C.Real time
D.Multitask

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单项选择题
The（）is the primary device for entering information into The computer.

A.disk
B.printer
C.keyboard
D.memory
单项选择题
（）is the process of converting text，sound，photos and video to data that can be processed by computer.

A.Computerization
B.Networking
C.Digitization
D.Informatization
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