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
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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
单项选择题
According to the passage, what do student researchers often learn when they discuss their work in class
A．Other students rarely have objective comments about it.
B．Other students do not believe the researchers did the work themselves.
C．Some students feel that the conclusions are too obvious.
D．Some students do not understand the meaning of the researchers’ questions.
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