单项选择题

What are they talking about

A．The environmental problem.
B．The health problem.
C．The educational problem.
D．The international problem.
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A．kindsB．sortC．meanD．types
A．kinds
B．sort
C．mean
D．types
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What’s the main purpose of this talk
A．To explain why recycling important.
B．To describe the recycling program.
C．To discuss whether or not recycling should be mandatory (命令性的).
D．To explain how to find the recycling facilities.
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