题目

阅读下面短文, 在空白处填入1个适当的单词或括号内单词的正确形式。Many people have the hobby of collecting things, e.g. stamps, postcards or antiques. In the 18th and 19th centuries, 【1】 (wealth) people travelled and collected plants, historical objects and works of art. They kept their collection at home until it got too big 【2】 until they died, and then it was given to a museum. The 80,000 objects collected by Sir Hans Sloane, for example, 【3】 (form) the core collection of the British Museum 【4】 opened in 1759.The parts of a museum open to the publi水热法制备Fe3O4纳米颗粒的反应为3Fe2++2S2O32-+O2+xOH-→Fe3O4+S4O62-+2H2O，下列说法中，不正确的是（　　） A、每生成1mol Fe3O4，反应转移的电子总数为2molB、Fe2+和S2O32-都是还原剂C、1mol Fe2+被氧化时，被Fe2+还原的O2的物质的量为13molD、x=4