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[听力原文] Technological Innovat......

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单项选择题
What development caused a decline in the use of railroads
A．The use of oversized freight containers.
B．Safety problems with railroad tracks.
C．The growth of the automotive industry.
D．The high cost of meeting environmental regulations.
单项选择题
As the conversation begins, what are the man and the woman doing
A．Looking at some photographs.
B．Selling cameras.
C．Teaching a photography class.
D．Repairing camera equipment.
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