单项选择题

It is difficult find out computer criminals because______.

A．computer criminals don't use weapons
B．computer criminals seldom leave any traces
C．computer forget who used them
D．computer simply do what they are told.

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单项选择题

What can be concluded from the last paragraph of the passage

A．Computer crimes are all so poorly done.
B．Computer criminals are minor employees.
C．Of all crime, computer theft is but the tip of the iceberg.
D．There is much computer crime committed by real experts.

单项选择题

According to the passage, which of the following might explain the reasons for some other computer crimes

A．Personal jealousy.
B．Revenge.
C．Professional jealousy.
D．Thirty days' notice.