This is my family tree. My name is Jack. I'm English. I have a big family. My wife(妻子) Allen is a teacher. We have two children. Tom is my son. Linda is my daughter. They are students in No. 2 Middle School. My father's name is Jeff. My mother's name is Grace. They are at home. Bill is my brother. He is a worker. Nancy is my wife's sister. She is a doctor. My wife's mother's name is Sue. Her father's name is Harry. They are old, too.

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《唐律疏议》记载：“脯肉有毒，曾经病人，有余者速焚之，违者杖九十；若故与人食并出卖，令人病者，徒一年；以故致死者绞；即人自食致死者，从过失杀人法。”材料表明唐代法律（    ）

 把X、Y、Z三种金属分别放入稀盐酸中，X、Y溶解并有气泡产生，Z不反应，取过量X放入Y（NO₃）₂和Z（NO₃）₂的混合溶液中充分反应后过滤，经检验，滤渣中只有X、Z．则X、Y、Z三种金属的活动性由强到弱的顺序是（　　）