单项选择题

A．Hence
B．Therefore
C．However
D．Provided
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单项选择题
A．byB．forC．aboutD．lined
A．by
B．for
C．about
D．lined
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.
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