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A．By forcing them farming.
B．By affecting the quality of soils.
C．By adding chemicals and pollute the waterways.
D．By affecting the environments they live in.
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单项选择题
Which of the following is the best title for the passage
A．African Elephants and the Ivory Trade.
B．A Bid to Save the Elephant.
C．The Poachers.
D．Elephants in Danger.
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