A：中和反应有盐和水生成，所以有盐和水生成的化学反应一定是中和反应
B：单质只含一种元素，所以含一种元素的物质一定是单质
C：离子是带电的原子或原子团，所以带电的微粒一定是离子
D：溶液是由溶质和溶剂组成，所以溶液一定是混合物
当x为多少时，代数式3x＋2与x－3的值互为相反数．
— Leonardo didn't win an Oscar __________ he acted in The Revenant《荒野猎人》.
— Yeah. It was hard for him to realize this dream, but he never gave up.
