下列说法错误的是（　　）

A．向Na₂S 溶液中滴入酚酞试液，呈红色．

B．升高温度能使FeCl₃ 溶液中c（H⁺）增大

C．一切钾盐，钠盐，硝酸盐都不发生水解

D．Na₂SO₄ 不水解，溶液显中性

______the night of the full moon many people go to the park to have a good time.

                                                                                                                                                        [ ]

A.At  

B.In  

C. On  

D.Around