单项选择题

A．Trade coins with club members.
B．Show the audience some of the coins.
C．Explain how the penny is minted.
D．Discuss the life of Lincoln.
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单项选择题
According to the passage, the extinction of whales is caused by ______.
A．man’s continuous evolution process
B．people’s excessive hunting and killing
C．the changing living conditions in nature
D．the demand from a booming economy
填空题
Production diseases arise when too many animals are confined into small space to live in.
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