单项选择题

A．by
B．for
C．about
D．lined
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单项选择题
What’s the talk mainly about
A．Green house effect.
B．Garbage treatment.
C．Environment protection.
D．Over-packaging problem.
单项选择题
Who was the man by profession
A．He was a businessman.
B．He used to be a pilot.
C．He was a driver.
D．He used to be a steward.
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