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.
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单项选择题
Several tourism companies believe space travel is going to be a new profitable industry.
A．Y
B．N
C．NG
单项选择题
A．Her taking improper sleeping medications.B．Her having unusual stress lately.C．Her having a poor digestion.D．Her having insufficient physical activities.
A．Her taking improper sleeping medications.
B．Her having unusual stress lately.
C．Her having a poor digestion.
D．Her having insufficient physical activities.
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