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
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
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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