Most English people have three names: a first name, a middle name and a family name. For example, my full name is Ann Allan Green. Green is my family name. Ann and Allan are my given names. People don't use their middle names very much.So we can say Ann Green. We can say Miss Green or Mrs. Green. But we can't say Miss Ann or Mrs. Ann. It's different from Chinese names. In China, the first name is the family name and the last name is the given name.

甲物质是一种重要的有机化工原料．甲和乙反应生成丙和丁的微观示意图如下，则下列说法中正确的是____．

A．反应前后分子的种类、个数不变       B．丙、丁是氧化物

C．生成的丙、丁两物质的质量比是1：1    D．____．

在用稀硫酸与锌制取氢气的实验中，加入少量硫酸铜溶液可加快氢气的生成速率．请回答下列问题：