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
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
单项选择题
America university students are usually under pressure of work because _______.
A．their academic performance will affect their future careers
B．they are heavily involved in student affairs
C．they have to observe university discipline
D．they want to run for positions of authority
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