We must do what we can to ____________the river ______________.

A．protect; against polluting

B．stop; polluting

C．keep; being polluted

D．prevent; from being polluted

推法包括（）。

A、斜推法，掌推，指推

B、全推法，肘推，掌推

C、平推，掌推，指推

D、指推，掌推，肘推