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 suggests in the last paragraph that ________.
A．we should make full use of the Internet before security measures are strengthened
B．we should alert the most influential businessmen to the importance of security
C．influential businessmen should give priority to the improvement of Net security
D．net inhabitants should not let security measures affect their joy of surfing the Internet
单项选择题
By saying ... owners of well over half of all World Wide Web sites have set up home without fit- ting locks to their doors (Lines 3--4, Par
A．2), the author means that ________.A. those happy times appear still to be with usB. there simply wasn't any crime to worry aboutC. many sites are not well-protectedD. hackers try out tricks on an Internet site without actually breaking in
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