单项选择题

A．The threat of poisonous desert animals and plants.
B．The exhaustion of energy resources.
C．The destruction of oil wells.
D．The spread of the black soot from the fires.
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单项选择题
A．They thought it was quite acceptable.B．They believe it to be a luxury.C．They took it to be a trend.D．They considered it avoidable.
A．They thought it was quite acceptable.
B．They believe it to be a luxury.
C．They took it to be a trend.
D．They considered it avoidable.
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