单项选择题

The owner was going to trip（）

A．by air
B．by water
C．by train
D．with his family

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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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