单项选择题

23（）

A．except
B．of
C．out of
D．among

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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

The possibility that a virus causes human cancer is indicated by （）

A．the fact that viruses have been known to mutate
B．the fact that a cancer-immune individual may lose his immunity
C．the fact that production of human cancer cells might be due to a genetic factor
D．the fact that man is host to many viruses