单项选择题

A．The woman is eager to enter politics.
B．The man has worked for the government.
C．People will become old after entering politics.
D．Female politicians are rar
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单项选择题
A．A controlled study.B．A trial study.C．An observational study.D．A successful study.
A．A controlled study.
B．A trial study.
C．An observational study.
D．A successful study.
单项选择题
A．Photocopy service.B．Enlarger.C．Computer service.D．Typewriter.
A．Photocopy service.
B．Enlarger.
C．Computer service.
D．Typewriter.
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