单项选择题

A．18 American undergraduates.
B．18 overseas undergraduates.
C．18 American postgraduates.
D．18 overseas postgraduates.
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单项选择题
A．The conversion of volcanic waste to fertilizer.B．The menace of currently dormant volcanoes around Mount Saint Helens.C．The eruption of Mount Saint Helens and its effects on the environment.D．The elimination of volcanic ash by natural means.
A．The conversion of volcanic waste to fertilizer.
B．The menace of currently dormant volcanoes around Mount Saint Helens.
C．The eruption of Mount Saint Helens and its effects on the environment.
D．The elimination of volcanic ash by natural means.
单项选择题
A．A one-bedroom apartment.B．A two-bedroom apartment.C．A three-bedroom apartment.D．An apartment with a yard.
A．A one-bedroom apartment.
B．A two-bedroom apartment.
C．A three-bedroom apartment.
D．An apartment with a yard.
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