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.

<上一题目录下一题>

热门试题

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

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