单项选择题

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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单项选择题What is the main topic of the lecture

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 您的浏览器不支持 audio 元素。