题目

（10分）有A、B、C、D四种短周期元素，其原子序数依次增大。A、B可形成A2B和A2B2两种化合物，B、C同主族且可形成CB2和CB3两种化合物。回答下列问题。(1) A2B2的电子式为____________。(2)CB2通入A2B2溶液中可被氧化为W，用W的溶液(体积为1 L，假设变化前后溶液体积变化忽略不计)组装成原电池(如图所示)。在b电极上发生的反应可表示为：PbO2＋4H＋＋SO＋2e－＝PbSO4＋2H2O，则在a电极上发生的反应可表示为_________________。 (3)金属元素E是中学化学常见元素，位于元阅读理解。     In the deep blue Indian Ocean, there's a beautiful island (岛) country called Maldives (马尔代夫). It's the smallest in population and area of all the Asian countries. It has an area of 90,000 km2, but 99% of the area is covered by the sea. It has 1,190 islands and is about 820 km from North to South. People live on no more than 200 islands, while another 87 are visited by tourists. Some of the islands are only used for fishing or farming. The capital Maléis is on one of the middle islands, and about 75,000 people live there. The people there are friendly and welcoming. They use their traditional games to welcome people from all over the world. It is sunny on the islands almost every day, and makes them look so beautiful. People can enjoy lots of things in Maldives. 1. How many people live in the capital Maléis? A. 75,000. B. 90,000. C. 1,190. D. 200. 2. What does the writer mean "Some of the islands are only used for fishing or farming"? A. There are no people living on some islands in Maldives. B. Tourists are everywhere in Maldives. C. People in Maldives like traveling very much. D. People in Maldives can do nothing except fishing or farming. 3. What does the writer think of the people in the Maldives? A. He thinks they're boring. B. He thinks they're poor. C. They are friendly and welcoming. D. He doesn't like them.