单项选择题

（ ） are those programs that help find the information you are trying to locate on the WWW.

A．Windows
B．Search Engines
C．Web Sites
D．Web Pages
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单项选择题
In C language, a （ ） is a series of characters enclosed in double quotes.
A．matrix
B．string
C．program
D．stream
单项选择题
（ ） is a device that converts images to digital format.
A．Copier
B．Printer
C．Scanner
D．Display
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