单项选择题

In C language，the usual expression statements are______or function calls.

A．I/Os
B．assignments
C．operations
D．evaluations
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单项选择题
The usual address for a Web site is the______page address，although you can enter the address of any page and have that page sent to you．
A．home
B．main
C．host
D．house
单项选择题
Most______measures involve data encryption and password.
A．security
B．hardware
C．display
D．program
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