题目

下列说法正确的是A. 酸中都含有氢元素，所以含有氢元素的化合物一定是酸B. 铁、银、硫酸铜溶液可用于比较铁、铜、银三种金属的活动性C. 中和反应生成盐和水，所以生成盐和水的反应一定是中和反应D. 金属与盐酸反应放出气体，所以与盐酸反应放出气体的物质一定是金属 答案：【答案】B【解析】A、含有氢元素的化合物不一定是酸，例如氢氧化钠是碱，其中含有氢元素，该选项说法不正确；B、把铁、银分别伸入硫酸铜溶液中，铁表面析出红色固体，是因为铁和硫酸铜反应生成硫酸亚铁和铜，说明铁比铜活泼，银表面无明显现象，是因为银不能和硫酸铜反应，说明铜比银活泼Tears come out of my eyes when I talk to my parents on the phone. What are they doing when I call them? This is w______1.I want to know most. I promise my mother to study hard in the university because I am her h________2.. I just want her to promise me that she can take care of h_____3. and my dad because they are just l _4. the blood in my body.In my family, everyone is equal. We are very happy to have meals together. Mum says that the h____5. time for Dad and her is to see my sister and me come back home. We play cards in the room, watch TV and do anything we like, with Dad and Mum p ____6. delicious food in the kitchen. I forget all the difficulties and unhappiness at that t ____7.. The o_____8. thing I would like to do is to enjoy the time with my parents.Sometimes, love doesn’t n_______9. many words. Love your parents as they love us. G_____10. them a call, telling them you love them and miss them.