单项选择题

A．The climate.
B．One’s social position.
C．The materials available.
D．Family siz
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单项选择题
A．Doctor and patient.B．Policeman and car driver.C．Librarian and student.D．Post clerk and customer.
A．Doctor and patient.
B．Policeman and car driver.
C．Librarian and student.
D．Post clerk and customer.
填空题
investigated
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