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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In C language, （ ） are used to create variables and are grouped at the top of a program block.
A．declarations
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D．descriptions
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（ ） are those programs that help find the information you are trying to locate on the WWW.
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