单项选择题

A．The summer vacation.
B．The housing office.
C．Resident advisers.
D．Check-out procedures.
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单项选择题
A．They are used to earning their own money.B．They often live alone.C．They don’t start conversation with men.D．They may ask men for dance.
A．They are used to earning their own money.
B．They often live alone.
C．They don’t start conversation with men.
D．They may ask men for dance.
填空题
At Penn State University, engineers have designed aircraft wings that can change shape in different phases of flight, ______.
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