单项选择题

A．A survey.
B．A simple technique.
C．A statement.
D．An exampl
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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.
单项选择题
A．It is needed to adjust the temperature of our bodies.B．It is our second need.C．We need it to cover our bodies.D．Weather is changing all the tim
A．It is needed to adjust the temperature of our bodies.
B．It is our second need.
C．We need it to cover our bodies.
D．Weather is changing all the tim
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