单项选择题

A．Not to subscribe to the journal.
B．To buy the latest issue of the magazine.
C．To find a better science journal in the library.
D．Not to miss any chance to collect useful information.
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单项选择题
The passage mainly about________.
A．why computer crimes are difficult to detect by systematic inspections
B．why computer criminals are often able to escape punishment
C．how computer criminals manage to get good recommendation from their former employers
D．why computer crimes can’’t be eliminated
问答题
It is universally acknowledged______________________ (树木对我们来说是不可或缺的).
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