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
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
单项选择题
According to the passage, how do students in class often react to another student's research
A．They react the way they do to any other research.
B．They are especially critical of the quality of the research.
C．They offer unusually good suggestions for improving the work.
D．They show a lot of sympathy for the student researcher.
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