单项选择题

In sentence 3 of paragraph 2, what's the meaning of the word "algae"

A．animal
B．water plant
C．fish
D．grass
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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
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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