单项选择题

The problem raised by the author in solid waste treatment and reuse is ______.

A．economic and social
B．political and industrial
C．governmental and political
D．traditional and habitual
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单项选择题
The article suggests that garbage and refuse from homes and public places ______.
A．make up the largest percentage of solid wastes
B．make up a small percentage of solid wastes
C．are not really considered in the solid waste problem
D．are considered of no use to the earth
单项选择题
To make his point, the author uses ______.
A．social opinions
B．an emotional request
C．sound arguments
D．factual information
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