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
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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
Which of the following is true according to the text
A．Personal search agents are indispensable to job hunters.
B．Some sites keep E-mailing job seekers to trace their demands.
C．Personal search agents are also helpful to those already employed.
D．Some agents stop sending information to people once they are employed.
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