X、Y、Z均由短周期元素组成的中学常见物质，存在如下转化关系：XYZ，下列说法错误的是（　　）

材料一：

文成公主入藏壁画

材料二：他（忽必烈）仿效中原王朝的政治体制，建立行省制度。……进行有效的统治。将西藏、云南、辽阳、岭北等边陲地区都置于中央政府管辖之下。

材料三：清朝统治者为了加强对西藏地区的统治和管辖，采取了一系列强有力的措施：顺治帝和康熙帝先后分别接见了达赖和班禅，确立了两位宗教领袖的册封制度，既肯定了达赖和班禅在藏传佛教中的宗教领袖地位，又明确了清朝廷和西藏是中央与地方的关系：清朝还在藏族地区设立驻藏大臣，即派驻西藏的最高行政长官……1792年清政府颁布了《钦定西藏章程》。规定驻藏大臣督办藏内事务，达赖、班禅事无大小应秉明驻藏大臣办理，进一步强化了驻藏大臣的权力：创立“金奔巴瓶”制度，这一制度规定在驻藏大臣主持下完成继承仪式……使中央紧紧地把达赖和班禅继承权的选择掌握在手中……

    A group of students at Sunshine School are holding a charity sale to raise money to help their classmate Lisa. Lisa had cerebral palsy (大脑性瘫痪) when she was a baby. People who have cerebral palsy have trouble walking. Although Lisa has to use a wheelchair (轮椅) to help her get around, she never gives up.

    "Lisa has the chance of standing up, but she needs an operation (手术)," Lisa's doctor said.

    "I never thought that I could stand up one day. Actually the news is surprising for me. However, when I see my parents are worried about the cost of the operation, I am sad. I don't mind if I can't stand up," Lisa said. "Now my classmates and some other kind people are helping me. I am really thankful."

    "While helping Lisa, we can also learn a lot. We have learned how to cook cookies (曲奇饼) and how to sell them," Betty, one of Lisa's classmates said. "Now we know making money is not easy, so we won't waste money anymore."

    Alex, a boy in Lisa's class, told a reporter that they could raise about $100 every day. "We have raised about $2,100 so far. We hope we will raise more money for Lisa's operation," he said.