单项选择题

A．They can be used to do business with people.
B．They can be used to express all kinds of feelings.
C．They can be used to deliver all the messages in our life.
D．They can be used to convey our most important messages to people.
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填空题
S2. What are the things the author think teachers should do but haven’t done______.
单项选择题
A．Find a quiet place to study.B．Change the conditions of his room.C．Find a more comfortable place to study.D．Avoid distractions while studying in his room.
A．Find a quiet place to study.
B．Change the conditions of his room.
C．Find a more comfortable place to study.
D．Avoid distractions while studying in his room.
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