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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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.
单项选择题
What does the author think about trying to find weaknesses in other people's research
A．It should only be attempted by experienced researchers.
B．It may cause researchers to avoid publishing good work.
C．It is currently being done to excess.
D．It can be useful in planning future researc
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