单项选择题

The virus can affect the computers in the computer system by ______.

A．turning off the power
B．making them copy itself
C．sending them copies of itself
D．sending them some destructive ordens directly
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单项选择题
In paragraph 1, They were linked by telephones , they refers to ______.
A．computers
B．government agencies
C．private companies
D．universities
单项选择题
Which of the following statements is true
A．Many computers were attacked by a virus in the U. S.
B．Many computers attacked by a virus in the U.S. lost their information.
C．A computer virus can harm human body.
D．A computer virus can help the computer owner do many things.
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