单项选择题

Which of the following is difficult for robots to do at present

A．To assemble machines.
B．To do some kinds of cleaning.
C．To work as service men.
D．To tell that the corner where walls and ceilings meet goes in, not out.
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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 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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