单项选择题

The 1978 - 1987 averages of productivity are less than ______.

A．1%
B．2%
C．1.5%
D．4%
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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
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
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