单项选择题

A．They smile to cover embarrassment.
B．It is an unusual and even suspicious behavior.
C．They smite to show politeness.
D．It is an expression of pleasure.
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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 time.
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 time.
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