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单项选择题

A．Green house effect.B．Garbage treatment.C．Environment ……


Questions 17-20 are based on the following passage. You now have 20 seconds to read questions 17-20.
What’ s the talk mainly about



A．Green house effect.
B．Garbage treatment.
C．Environment protection.
D．Over-packaging problem.
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A．It is very well established.
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