单项选择题

According to the passage, a barter economy can lead to（）

A．rapid speed of transaction
B．misunderstanding
C．inflation
D．difficulties for the traders

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单项选择题

In communication, it is essential not only to employ speech, but also （）

A．to speak directly to the other person
B．to employ a variety of bodily movements
C．to be certain that the other person is listening
D．to pay great attention to the other person’s behaviour

单项选择题

23（）

A．except
B．of
C．out of
D．among