单项选择题

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
A．By name.B．By number.C．By location.D．By month.
A．By name.
B．By number.
C．By location.
D．By month.
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