单项选择题

Under what circumstance the computer criminals may escape without detected according to the author in the second paragraph

A．If they hooked to computer anonymously.
B．If they are clever enough.
C．If they know how to operated computer.
D．If no one checks up on what the computer is doing.
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单项选择题
The passage is mainly about______
A．why computer criminals are often able to escape punishment
B．why computer crimes are difficult to detect by systematic inspections
C．how computer criminals manage to get good recommendations from their former employers
D．why computer crimes can' t be eliminated
单项选择题
In the third sentence of paragraph 2, the four quarters refers to______.
A．the four comers of the Indians' houses
B．the four elements that are believed to make up everything
C．the four seasons
D．the four directions
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