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
A．The distance-learning course is free of charge.B．The distance-learning course is taught by professors overseas.C．There is no regular class in the distance-learning course.D．There is no exam in the distance-learning course.
A．The distance-learning course is free of charge.
B．The distance-learning course is taught by professors overseas.
C．There is no regular class in the distance-learning course.
D．There is no exam in the distance-learning course.
单项选择题
A．He wanted Mary to come, but she couldn’’t.B．He invited Mary to the party.C．He didn’’t invite Mary to the party.D．He didn’’t want to have a party because of business.
A．He wanted Mary to come, but she couldn’’t.
B．He invited Mary to the party.
C．He didn’’t invite Mary to the party.
D．He didn’’t want to have a party because of business.
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