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
The best title for this passage would be ______.
A．Children Rule the World
B．Computer Languages
C．The Unreal World of the Child and LOGO
D．Children Learn Reasoning Using LOGO
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 cheating.
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