单项选择题

The best title for this passage is ______.

A．About Wastes
B．Hazardous Wastes
C．Results of Hazardous Wastes
D．Effects of Hazardous Wastes
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单项选择题
According to the passage, we can infer that underground pollutants ______.
A．can be carried by water flow.
B．may not reach the surface.
C．especially dangerous when they exist.
D．form spreading plumes of contaminants.
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