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
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, 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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