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A. most computer criminals who are caught blame their bad luck
B. the rapid increase of computer crimes is a troublesome problem
C. most computer criminals are smart enough to cover up their crimes
D. many more computer crimes go undetected that arc discovered

A. it is cold and wet all the year round
B. the climate is pleasant as a whole
C. it is warm most of the time in a year
D. only the summer is not cold and wet