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
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
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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