能用离子方程式H++OH-═H2O表示的化学反应是（ ）
A．4NH3+5O2
4NO+6H2O催化剂 . △
B．2H2+O2
2H2O点燃 .
C．CaCO3+2HCl═CaCl2+CO2↑+H2O
D．KOH+HNO3═KNO3+H2O
A．该反应氨气是非电解质，氧气是单质，一氧化氮是非金属氧化物是非电解质，水是极弱的电解质，该反应无离子参加，不是离子反应，不能用H++OH-═H2O表示化学反应，故A错误；
B．氢气、氧气都是非金属单质，水是极弱的电解质，该反应无离子参加，不是离子反应，不能用H++OH-═H2O表示化学反应，故B错误；
C．碳酸钙和盐酸发生的离子反应为CaCO3+2H+=Ca2++H2O+CO2↑，故C错误；
D．氢氧化钾是易溶于水的强碱，硝酸是易溶于水的强酸，两者反应生成硝酸钾和水，硝酸钾是易溶于水的盐，是强电解质，完全电离，所以该反应的离子反应方程式为：H++OH--═H2O，故D正确；
故选D．
(2013·高考湖北卷)Zigfried，a little mouse，blew his breath on the frosty window of the farmhouse and rubbed it to see the outside.Still nobody came.Maybe today，he thought____.It was only a few days before Christmas and he was watching for a miracle (奇迹)． This farmhouse had been____too long.It needed a family.Zigfried’s____made a noise.He realized that he hadn’t eaten anything since yesterday.He jumped from the windowsill (窗沿)，grabbed a____from his home，and went next door to Farmer Mike’s. Farmer Mike’s house had been a great place for the little mouse____the farmer married a wife who had a cat.Zigfried____when he thought of it.He looked around cautiously as he____into the room where grain was stored and was quite____as he filled his bag with wheat.He was turning to leave when suddenly he___a hot breath about his ear.His heart beat___，and without thinking he started to run and luckily____the cat’s paws (爪子)． The next afternoon Zigfried heard some good news：a____family would be moving into the farmhouse soon.Zigfried’s granny would arrive on Christmas Eve to____with him.He hoped that the family would come before his granny came.Before long，a car came____the road leading to the house，with butter sandwiches，cheese and chocolate. Zigfried’s Christmas miracle did arrive! The house came____the next few days.Zigfried____every single hour of them.____，the day before Christmas when he was drinking hot chocolate with a____smile at the door of his home，he heard the____of the children of the family about what they might get for Christmas.What？A cat？The____froze on his face；his mouth fell wide open.After a long while，he at last found his voice：“Hey! Whose Christmas miracle is this？”
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