单项选择题

I attended my mother's ________as president of the Parent-Teacher Association.

A．institution
B．instrument
C．installation
D．illustration
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单项选择题
In regard to the patient's sensitive skin, the doctor advised him to limit his ________to the sun.
A．expansion
B．exhibition
C．extension
D．exposure
单项选择题
The increase in student numbers ________many problems for the university.
A．forces
B．presses
C．provides
D．poses
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