单项选择题

Passage Three
Questions 32 to 35 are based on the passage you have just heard,

A．High school teachers.
B．Taxi drivers.
C．Waiters.
D．Fruit sellers,
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填空题
It is believed by some companies that alternative energy sources are significant especially when the recent price of oil and natural gas rose.
单项选择题
What does the word abstainer (Line 4, Para. 2) mean
A．Heavy drinkers.
B．People who never drink.
C．People who used to drink but not any more.
D．Moderate drinkers.
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