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
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单项选择题
It can be concluded that the disaster we are faced with now _________.
A．is a by-product of the oil-producing countries
B．is where to find new energy resources
C．can not be solved without coordinated efforts
D．is that no resources are inexhaustible
单项选择题
What contribution does the author feel people must now make
A．Search for new energy sources.
B．Outlaw motor transportation.
C．Accept a new life style.
D．Adopt a new form of government
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