下列反应的离子方程式书写正确的是（ ）
A．用小苏打治疗胃酸过多：HCO3-+H+=CO2↑+H2O
B．少量金属钠加到冷水中：Na+2H2O=Na++2OH-+H2↑
C．NH4HCO3溶液与过量的NaOH溶液共热：NH4++OH-
NH3↑+H2O △ .
D．Cl2通入水中：Cl2+H2O=2H++Cl-+ClO-
A．用小苏打治疗胃酸过多的离子反应为HCO3-+H+=CO2↑+H2O，故A正确；
B．少量金属钠加到冷水中的离子反应为2Na+2H2O=2Na++2OH-+H2↑，故B错误；
C．NH4HCO3溶液与过量的NaOH溶液共热的离子反应为HCO3-+NH4++2OH-
NH3↑+2H2O+CO32-，故C错误； △ .
D．Cl2通入水中的离子反应为Cl2+H2O=H++Cl-+HClO，故D错误；
故选A．
| 完形填空。 | |||
| There is a popular saying, "All of us have a Guardian Angel, guiding us". Some of the greatest success stories of 1 have followed a word of 2 or an act of confidence by a loved one or a 3 friend. Had it not been for a confident wife, Sophia, we might not have listed Nathaniel Hawt home among the great 4 of literature. One cold evening when Nathaniel, a 5 man, went home to tell his wife, Sophia, that he was a failure and had been fired from his job in the customs. she 6 him with a cry of joy. "Now," she said 7 , "you can write your book!" "Yes?" replied the man, with 8 confidence, "and what shall we 9 while I am writing it?" To his 10 , she opened a drawer and pulled out a sum of money. "Where on earth did you get that?" he asked. "I have always known you were a man of 11 ," she told him. "I 12 that someday you would write a great novel. So every week, out of the 13 you gave me for housekeeping, I saved a little bit. So here is enough to 14 us for one whole year." From her trust and 15 came one of the greatest novels of American literature, The Scarlet Letter. | |||
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