单项选择题

It is recommended in the passage as a security measure that people should ______.

A．turn off network services
B．employ a full-inspection firewall
C．make sure that servers and applications are combined
D．eliminate all the programs
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单项选择题
It can be inferred from the passage that ______.
A．employees will keep up with security polices and awareness if they are highly-trained
B．the rate of security attacks appears faster than the growth of the Internet
C．one's computer system will always be secure
D．vulnerabilities cannot go through phones, wireless devices
单项选择题
It is important for specialists to be able to travel because ______.
A．there are so many people working in similar fields
B．there is a lot of social unrest at universities
C．their follow experts are scattered round the world
D．their laboratories are in remote places
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