单项选择题

A．could not bring profits or save much laborB．attract p……

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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热门试题

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, 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.

单项选择题What does the author conclude about preparing suitable questions for a research project

A．It is more difficult than the student researcher may realize.
B．The researcher should get help from other people.
C．The questions should be brief so that they will he understood.
D．It is important to follow formulas closely.