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
What may contribute to the unfair use of concentrated power and wealth by some people
A．Their greed for profit makes them ignore the expense.
B．They have accumulated too much wealth and power.
C．They make profits by pretending to be blind.
D．They make profits by cheatin
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.
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