单项选择题

My brain may be old, but it is not addled .

A．confused
B．rotten
C．stupid
D．disorder
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单项选择题
Many of these writers used to study in writingclinics.
A．hospitals
B．circles
C．workshops
D．firm
单项选择题
SATAN, a program designed by Dan Farmer can be used______.
A．to investigate the security of Internet sites
B．to improve the security of the Internet system
C．to prevent hackers from breaking into websites
D．to download useful programs and information
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