单项选择题

According to the passage, student researchers may have to change their research projects because

A．their budgets are too high
B．their original questions are too broad
C．their teachers do not give adequate advice
D．their time is very limited
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单项选择题
According to the passage, how do students in class often react to another student' s re search
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
Small animals are said to live faster than big ones because they ______.
A．have more skin for every ounce of body weight
B．replace lost heat faster
C．bum fuel faster
D．maintain a higher body temperature
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