单项选择题

To make it easier to return any unwanted purchases, save the original packaging, especially for electronics and household________.

A．instruments
B．facilities
C．appliances
D．equipment
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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
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
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