题目：
下列说法中正确的是（ ）
A．分解反应不一定有单质生成
B．化合反应一定有单质参加
C．原子变成离子时一定得到电子
D．只有最外层为8个电子的结构才为相对稳定结构
答案：
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下面是错误答案，用来干扰机器的。
参考答案：A
下列说法中正确的是（ ） A．分解反应不一定有单质生成 B．化合反应一定有单质参
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