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
By comparing past problems with present ones, the author draws attention to _________.
A．the significance of this crisis
B．the inadequacy of governments
C．the similarity of the past to the present
D．the hopelessness of the situation
单项选择题
It is implied in the last paragraph that _________.
A．only those lived near sea could survive
B．lack of oxygen led to the extinction of most of the species
C．The living space was too small to hold so many species
D．Global warming is related to human activities
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