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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单项选择题
The author's attitude toward SATAN is ________.
A．enthusiastic
B．critical
C．positive
D．indifferent
单项选择题
Farmer's program has been criticized by the public because, ________.
A．it causes damage to Net browsers
B．it can break into Internet sites
C．it can be used to cause disorder on all sites
D．it can be used by people with evil intent
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