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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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, Para. 2), the author means that ________.
A．those happy times appear still to be with us
B．there simply wasn't any crime to worry about
C．many sites are not well-protected
D．hackers try out tricks on an Internet site without actually breaking in
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
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