单项选择题


Questions 23 to 25 are based on the conversation you have just heard.

A．Salt.
B．Chemical pollutants.
C．Germs.
D．Minerals.
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填空题
We should be informed of the potential harm about cloning.
单项选择题
A．New York.B．Liverpool.C．Los Angeles.D．London.
A．New York.
B．Liverpool.
C．Los Angeles.
D．London.
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