单项选择题
The words "Barges and steamers" could best be replaced by which of the following
A．Trains.
B．Planes.
C．Boats.
D．Trucks.
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单项选择题
According to the passage, where were large deposits of iron uncovered
A．In Pittsburgh.
B．In the Mesabi Range.
C．Near Lake Michigan.
D．Near Lake Erie.
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单项选择题
It can be inferred from the passage that the mass production of steel caused ______.
A．a decline in the railroad industry
B．a revolution in the industrial world
C．an increase in the price of steel
D．a feeling of discontent among steel workers
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