单项选择题

The average life-span of Americans is 80 years.（）

A、Right
B、Wrong
C、Not mentioned

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单项选择题
Muscle pain in hot weather means that your body needs（）

A．more exercise
B．more water
C．less oxygen
D．less sugar
单项选择题
Wayne had a neighbor and fishing friend who（）

A．worked as a doctor
B．was against the DBS procedure
C．benefited from the DBS procedure
D．was a victim of the DBS procedure
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