单项选择题

A．The air pollution is caused by the development of industry.
B．The city was poor because there wasn’’t much industry then.
C．The woman’’s exaggerating the seriousness of the pollution.
D．He might move to another city very soon.
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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
Several tourism companies believe space travel is going to be a new profitable industry.
A．Y
B．N
C．NG
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