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.
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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