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It can be inferred from the last paragraph that ______.
A．your computer will always keep safe the important information
B．computer problems are easy to deal with
C．you will have to replace your computer system sooner or later
D．you must change your system regularly
A．The office was closed the first time she went there.
B．The computer was out of service at that time.
C．She didn't have acceptable identification on her first visit.
D．She failed to meet the director on her first visit.
In the late 1950' s, for the first time a computer programming language ______.
A．began using binary numbers
B．was used to implement the Unix operating system
C．was put into the market
D．was used for modeling physical and environmental events
The line of computing jobs waiting to be run on a computer system might be a(71). The jobs are serviced in the order of their arrival，that is，the first in is the first out.
A．queue
B．stack
C．array
D．record
Good advice for collectors is "______".
A．Never save the first specimen you find
B．Always save the first specimen you find
C．Save the second specimen you find
D．Save all but the first specimen you find
The first paragraph mainly discusses______.
A．the features of the computer age
B．the phenomenon of quantification
C．the mutual influence between computers and human
D．the change in the working modes of human minds
A．fit
B．set
C．disposed
D．decided
At first computer networks ______.
A．worked quite well
B．were very popular
C．went wrong easily
（）is the first line of protect between your computer and the public Internet.
A.The Internet protocolB.The firewallC.The anti-virus software D.The intrusion-detection systems
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