单项选择题


Questions 11 to 18 are based on the conversation you have just heard.

A．1:50.
B．1:55.
C．2:00.
D．2:05.
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单项选择题
What is the one huge problem that we haven’t really solved
A．Global warming.
B．Acid rni9.
C．Toxic emission.
D．Environment.
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