单项选择题

In the first paragraph the last sentence "... in people who do so", What's the meaning of word "do so"

A．take up growing plants
B．eat crops grown there
C．may later appear
D．appear in animals
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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
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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