单项选择题

The expression" play safe" probably means"______ ".

A．to write carefully
B．to do as teachers say
C．to use dictionaries frequently
D．to avoid using words one is not sure of
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单项选择题
Some students are enthusiastic for positions in student organizations probably because______.
A．they hate the constant pressure and strain of their study
B．they will then be able to stay longer in the university
C．such positions help them get better jobs
D．such positions are usually well paid
单项选择题
The student organizations seem to be effective in ______.
A．dealing with the academic affairs of the university
B．ensuring that the students observe university regulations.
C．evaluating students' performance by bringing them before a court
D．keeping up the students' enthusiasm for social activities
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