单项选择题

By comparing past problems with present ones, the author draws attention to the ______.

A．significance of this crisis
B．inadequacy of governments
C．similarity of the past to the present
D．hopelessness of the situation
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单项选择题
We have been asked to defend ourselves and what we hold dear in cooperation with ______ who share with us the same endangered air and the same endangered oceans.
A．a country
B．a city
C．an area
D．all of the people
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 lifestyle.
D．Adopt a new form of government.
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