单项选择题

A．To encourage them.
B．To stop them immediately
C．To give some explanation.
D．To leave them alone.
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单项选择题
A．Being unable to communicate face to face with others.B．Having exams and tests.C．Phone calls are expensive.D．Professors are tough.
A．Being unable to communicate face to face with others.
B．Having exams and tests.
C．Phone calls are expensive.
D．Professors are tough.
单项选择题
A．A round piece of stone.B．A heavy log.C．Two slices of log connected at their centers by a strong stick.D．A piece of metal.
A．A round piece of stone.
B．A heavy log.
C．Two slices of log connected at their centers by a strong stick.
D．A piece of metal.
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