单项选择题

It is very likely that the part previous to this passage is about _______.

A．police skills
B．the role of informations
C．TV productions
D．studies of crime files
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单项选择题
According to the passage, the vast majority of crimes _______.
A．are very likely solved by routine investigation
B．can not be solved simply through routine investigation
C．are unlikely to be cleared up at all
D．can not be solved because the defendants are unknown
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