单项选择题

The night watchman was fired because ______.

A．he didn't devote himself to his work
B．he told the owner the terrible dream
C．he always told the truth
D．he dreamed terrible dreams
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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
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
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