单项选择题

Which condition does the author feel has nearly destroyed our cities

A．Lack of financial planning.
B．The breakup of the family.
C．Natural disasters in many regions.
D．The excessive growth of motors.
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单项选择题
The phrase brought on (Line 1, Para 4. ) most probably means _________.
A．cause to happen
B．accelerate
C．diminish
D．sustain
单项选择题
According to Peter Ward's research, _________.
A．90% of animals and plants went extinct 250 million years ago
B．dinosaurs died off as a result of meteor impacts
C．the "Great Dying" has much to do with volcanic activity
D．global warming played a minor part in the "Great Dying"
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