下列离子方程式书写正确的是（ ）
A．氧化铜与盐酸反应：O2-+2H+═H2O
B．澄清石灰水与稀盐酸反应：Ca（OH）2+2H+═Ca2++2H2O
C．在稀氨水中通入过量CO2：NH3•H2O+CO2═NH4++HCO3-
D．醋酸和氨水反应：H++OH-═H2O
A、氧化铜与盐酸反应的离子方程式为：CuO+2H+═H2O+Cu2+，故A错误；
B、澄清石灰水与稀盐酸反应的离子方程式为：OH-+H+═H2O，故B错误；
C、在稀氨水中通入过量CO2反应的离子方程式为：NH3•H2O+CO2═NH4++HCO3-，故C正确；
D、醋酸和氨水都是弱电解质，醋酸和氨水反应的离子方程式：CH3COOH+NH3•H2O═H2O+CH3COO-+NH4+，故D错误；
故选C．
| 完形填空：从A、B、C中，选择一个最佳答案，使短文意思完整。 | |||
| Some years ago, on a hot summer day, a little boy decided to go for a swimming in the river near his house. He went into the river and was 1 towards the middle, but he didn't find there was an alligator(鳄鱼)in the river. His mother in the house 2 out of the window and saw the alligator come near. She ran towards the river 3 and shouted(呼喊)at her son. The little boy 4 his mother's voice and swam to his mother. 5 it was too late. Just as the mother caught her little boy by the arms, the alligator caught his legs. The mother 6 her best to save(拯救)her son. Later, a farmer walking by killed the alligator with his gun. After several weeks in the 7 , the little boy got well. There were scars(伤疤)on his leg and arms. A newspaper 8 went to interview him and asked if he would 9 him his scars. The boy showed him his legs. And then 10 a great smile(微笑), he said to the interviewer, "But look at my arms. I have great scars on my arms, too. They're scars of love". | |||
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