单项选择题

An（）statement can perform a calculation and store the result in a variable so that it can be used later.

A．executable
B．input
C．output
D．assignment

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单项选择题
In C language,（）are used to create variables and are grouped at the top of a program block.

A．declarations
B．dimensions
C．comments
D．descriptions
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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