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单项选择题

A．To install a microelectronic wave detector.
B．To raise the alarm.
C．To install cell phone signal shielding facilities.
D．To ask students to switch off the handsets.
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单项选择题A．At the beginning of a semester.B．During midterm week.C．At the end of a semester.D．In the middle of summer vacation.

A．At the beginning of a semester.
B．During midterm week.
C．At the end of a semester.
D．In the middle of summer vacation.

单项选择题C