单项选择题

A．They always face rude people.
B．They always deal with dangerous events.
C．They can’t predict what will happen next minute.
D．They are too timid.
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单项选择题
A．To do research. B．To create new knowledge. C．To complete the professor’s assignments. D．To summarize what other people have written.
A．To do research.
B．To create new knowledge.
C．To complete the professor’s assignments.
D．To summarize what other people have written.
单项选择题
A．It is not worth talking about. B．It is quite appropriate. C．It should cover more events. D．It should be narrowed down.
A．It is not worth talking about.
B．It is quite appropriate.
C．It should cover more events.
D．It should be narrowed down.
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