单项选择题

According to the passage, the railroad industry preferred steel to iron because steel was ______.

A．cheaper and more plentiful
B．lighter and easier to mold
C．cleaner and easier to mine
D．stronger and more durable
<上一题 目录 下一题>
热门 试题

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
The words Barges and steamers could best be replaced by which of the following
A．Trains.
B．Planes.
C．Boats.
D．Trucks.
相关试题