单项选择题

Very long，complex expressions in program are difficult to write correctly and difficult to（）.

A．defend
B．detect
C．default
D．debug

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The term “（）program” means a program written in high-level language.

A．compiler
B．executable
C．source
D．object
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（）means “Any HTML document on a HTTP Server”.

A．Web Server
B．Web page
C．Web Browser
D．Web site
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