单项选择题

A．They were talking about their home towns.
B．They were discussing how echoes worked in different places.
C．They were joking with each other.
D．They were talking about their recent travels.
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单项选择题
A．George wants to change his work.B．George doesn’’t like his work.C．George is doing well now.D．George isn’’t doing well with his work.
A．George wants to change his work.
B．George doesn’’t like his work.
C．George is doing well now.
D．George isn’’t doing well with his work.
单项选择题
A．Droughts.B．Floods.C．Fossil fuels.D．Global warming.
A．Droughts.
B．Floods.
C．Fossil fuels.
D．Global warming.
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