单项选择题

The best title for this passage is（）

A．New Light on the Cause of Cancer
B．The Newest Theory on the Nature of Viruses
C．Viruses and Cancer
D．On the Nature of Life

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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

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