单项选择题

The multi-tube boiler system made the Rocket, Robert’s locomotive, ______.

A．powerful
B．achieve a speed of 30 miles an hour
C．acquire 25 little tubes
D．good for hauling trains
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单项选择题
At first, locomotives could not popularize themselves because they ______.
A．could not bring profits or save much labor
B．attract people
C．only caught some people’s interest
D．were not welcome
单项选择题
In a true sense, plateways are the earliest and most primitive railways invented by ______.
A．industrial workers
B．George Stephenson
C．the miners
D．the miner’s work
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