题目

下列电离方程式中，正确的是（   ） A．HClO4 == H++ClO4-                                                                            B．H2CO32H++CO32- C．H2PO4-+H2O== HPO42-+H3O+                      D．NH3・H2O == NH4++OH- 答案：A—More and more people come to visit Jingzhou Ancient City. —That’s true. It has become the ________ of Jingzhou.A. effort B. praise C. courage D. pride