单项选择题

The conservation mentioned in the passage includes the following EXCEPT ______.

A．natural resources
B．human welfare
C．human life
D．concentration of wealth
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单项选择题
On what does the efficiency of a nation depend
A．Every individual.
B．Its machines.
C．Its wealth.
D．Its power.
单项选择题
What plays an essential role in making the nation prosperous according to this passage
A．Its money.
B．Its trade.
C．Its natural resources.
D．Its peopl
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