有一包白色固体，它可能是KCl、K2CO3、KNO3中的一种或几种，进行下列实验：
①溶于水，得无色溶液；
②在所得溶液中滴入AgNO3溶液，生成白色沉淀（说明：Ag2CO3为白色沉淀）；
③再滴加稀硝酸，沉淀量减少但不完全消失，同时有气泡生成。根据上述现象判断：
（1）白色固体一定含有的成分是____________，可能含有的成分是_____________。
（2）请写出上述实验中有关反应的离子方程式________________________。
（1）KCl和K2CO3；KNO3
（2）Ag++Cl-==AgCl↓；2Ag++CO32-==Ag2CO3↓；Ag2CO3+2H+==2Ag++H2O+CO2↑
| 阅读表达。 | ||
the angels were wearing white clothes and each child carried a candle (蜡烛). He noticed that one child's candle was not lighted (点燃). Then he saw that the child was his little girl. ______ he rushed to her right away and put her into his arms. He kissed her and then asked, "Why is your candle alone unlighted, darling?" "Daddy, they often light it again, but your tears always put it out." Just then he woke up from his dream. The lesson was clear, and its effects were quick. From that hour on, he was not a sad father. He became cheerful with his friends. His darling's candle would not longer be put out by his useless tears. The father was too sad to communicate with others and to do anything. | ||
| 1. 从文中找出与下句意义相近的句子。 The father was too sad to communicate with others and to do anything. ____________________________________________________________________ 2. 根据短文内容，在空白处填上一个合适的连词。 ____________________________________________________________________ 3. 根据短文内容，回答问题。 Why did the father become cheerful at last? ____________________________________________________________________ 4. 将文中画线句子译成汉语。 ____________________________________________________________________ 5. 根据短文内容，写出文章的标题。（7个词以内） ____________________________________________________________________ |
