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单项选择题

A．They smile to cover embarrassment.
B．It is an unusual and even suspicions behavior.
C．They smile to show politeness.
D．It is an expression of pleasure.
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单项选择题A．He hasn’t decided on a topic for his composition.B．He has fallen behind others in English class.C．He hasn’t made up his mind as to what to write a bout.D．The look he borrowed will be due tomorrow.

A．He hasn’t decided on a topic for his composition.
B．He has fallen behind others in English class.
C．He hasn’t made up his mind as to what to write a bout.
D．The look he borrowed will be due tomorrow.

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.