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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A．20B．22C．21D．23
A．20
B．22
C．21
D．23
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A．His great happy smile.B．His sad and slow songs.C．His wonderful jazz music.D．His handsome appearance.
A．His great happy smile.
B．His sad and slow songs.
C．His wonderful jazz music.
D．His handsome appearance.
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