单项选择题

A．Jealous.
B．Indignant.
C．Negative.
D．Proud.
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单项选择题
SATAN, a program designed by Dan Farmer, can be used ________.
A．to prevent hackers from breaking into websites
B．to download useful programs and information
C．to improve the security of the Internet system
D．to investigate the security of Internet sites
单项选择题
A．A fuel that burns cleanly.B．An oil additive that helps cool engines.C．A material from which filters are made.D．An insulating material sprayed on engine parts.
A．A fuel that burns cleanly.
B．An oil additive that helps cool engines.
C．A material from which filters are made.
D．An insulating material sprayed on engine parts.
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