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
About the effect of hazardous wastes, which of the following statements is true
A．We can't feel hazardous wastes directly
B．Hazardous wastes connect with each other
C．Evaporation of toxic solvents from paints and cleaning agents is a common problem.
D．Hazardous wastes lie everywhere in the world
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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