单项选择题

A．4 weeks.
B．6 weeks.
C．8 weeks.
D．10 weeks.
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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.
填空题
What did Roosevelt say in his speech in Chicago
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