单项选择题

Questions 28 to 30 are based on the passage you have just heard.

A．A couple’s experience as volunteers.
B．The need for volunteers in the Third World.
C．A new public emphasis on volunteering.
D．The rewards of volunteering.
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单项选择题
A．They have great effect on people’s intelligence.B．They have some effect on most people’s intelligence.C．They have effect on some people’s intelligence.D．They have no effect on people’s intelligence.
A．They have great effect on people’s intelligence.
B．They have some effect on most people’s intelligence.
C．They have effect on some people’s intelligence.
D．They have no effect on people’s intelligence.
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