单项选择题

The process known as pyrolysis ______.

A．treats scrap from industry
B．reduces refuse into basic chemicals
C．mixes scattered wastes together
D．provides refuse for a collection building
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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
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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