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 is one major criticism students often make of published research
A．The research has been done in unimportant fields.
B．The researchers did not adequately establish the relationships involved.
C．The researchers failed to provide an appropriate summary.
D．The research has not been written in an interesting way.
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