下列叙述正确的是

A．浓度均为0.1mol•L^—1的CH₃COOH和CH₃COONa溶液等体积混合所得的溶液中：

c(CH₃COOH)+c(CH₃COO^—)=0.2mol•L^-1

B．0.1mol•L^-1NaHCO₃溶液中：c(Na⁺)=c(HCO₃^-)+c(H₂CO₃)+2(CO₃^2-)

C．0.2mol•L^-1HCl溶液与等体积0.1mol•L^-1NaOH溶液混合后，溶液的pH=1

D．0.1mol•L^-1氨水中滴入0.1mol•L^-1盐酸至溶液呈中性时，混合溶液中：c(NH₄⁺)=c(Cl^—)

The proposals they put ______ at the meeting were ______much significance to our plan’s being carried out smoothly.

A．out; of

B．up; for

C．forward; of

D．down; for