单项选择题

A．By good sense of water waves made by quarries.
B．By good sense of smell and electrical and magnetic power.
C．By good sense of light.
D．By good sense of blood.
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单项选择题
A．4 weeks.B．6 weeks.C．8 weeks.D．10 weeks.
A．4 weeks.
B．6 weeks.
C．8 weeks.
D．10 weeks.
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.
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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