I recognize her __I met her at the airport, although we haven’t seen each other for ten years.

A．the moment

B．in the moment

C．for the moment

D．at the moment

关于常温下pH＝3的醋酸溶液，下列叙述正确的是

A．加水稀释10倍后，pH＝4

B．加水稀释后，溶液中c(H⁺)和c(OH^－)均减少

C．加入醋酸钠晶体后，溶液的pH增大

D．加入等体积、pH＝11的NaOH溶液后，c(Na⁺)＝ c(CH₃COO^－)