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

According to the passage, how did Bessemer method make the mass production of steel possible（）

A．It directed air at melted iron in a furnace, removing all impurities.
B．It slowly heated iron ore then stirred it and heated it again.
C．It changed iron ore into iron which was a substitute for steel.
D．It could quickly find deposits of iron ore under the ground.

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