题目

There are many interestingbooks to choose from, but I don't know which one is (suit) for me. （用所给单词适当形式填空） 答案：【1】suitable把相同质量分数的稀盐酸分别滴加到x、Y、z三种金属中，Y表面有气泡产生，x、z始终无明显变化；把x的硝酸盐溶液滴加到z中，z表面析出x．则x、Y、z三种金属的活动性顺序为（ ）A．Z＞Y＞XB．Y＞X＞ZC．Y＞Z＞XD．X＞Z＞Y