单项选择题

A．Friends.
B．Two police officers.
C．A police officer and an investigator.
D．A police officer and a program hostess.
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单项选择题
A．Four contestants failed to win prizes.B．The woman missed the show.C．The man participates in the quiz show.D．Five contestants won cell phones.
A．Four contestants failed to win prizes.
B．The woman missed the show.
C．The man participates in the quiz show.
D．Five contestants won cell phones.
单项选择题
Which of the following is not the reason for the growth of specialization
A．Accumulation of scientific knowledge.
B．Convenience for future research.
C．Easy handling of information.
D．The development of communication.
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