X、Y、Z、M代表四种金属，金属X和Z用导线连接放入稀硫酸中时，X溶

X、Y、Z、M代表四种金属，金属X和Z用导线连接放入稀硫酸中时，X溶解，Z

极上有氢气放出；若电解Y²⁺离子和Z²⁺离子共存的溶液时，Y先析出；又知M²⁺离子

的氧化性强于Y²⁺离子。则这四种金属的活动性由强到弱的顺序为

A．X>Z>Y>M B．X>Y>Z>M C．M>Z>X>Y D．X>Z>M>Y

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