题目

下列能确定是酸溶液的是(     ) A．pH＜7的溶液 B．能使紫色石蕊试液变红色的溶液 C．能与锌粒反应生成氢气的溶液 D．溶液中阳离子只有氢离子的溶液 答案：【考点】酸的化学性质；溶液的酸碱性与pH值的关系． 【专题】常见的酸 酸的通性． 【分析】根据酸的定义进行分析，电离时电离出的阳离子全部是氢离子的化合物叫酸，据此分析． 【解答】解：A、pH值小于7的溶液呈酸性，不一定是酸，故A错误； B、能使紫色的石蕊试液变红的溶液呈酸性，不一定Although problems are a part of our lives, it certainly doesn’t mean that we let them rule our lives forever. One day or the other, you’ll have to stand up and say – problem, I don’t want you in my life. 1. Problems with friends, parents, girlfriends, husbands, and children – the list goes on. Apart from these, the inner conflicts within ourselves work, too. These keep adding to our problems. Problems come in different shapes and colors and feelings.But good news is that all problems can be dealt with. Now read on to know how to solve your problems.Talk, it really helps. What most of us think is that our problem can be understood only by us and that no talking is going to help. 2. Talking helps you move on and let go.Write your problems. 3. When you write down your problems, you are setting free all the tension from your system. You can try throwing away the paper on which you wrote your problems. By doing this, imagine yourself throwing away the problems from your life.Don’t lose faith and hope. No matter what you lose in life, don’t lose faith and hope. Even if you lose all your money, family… you should still have faith. 4. Your problems aren’t the worst. No matter what problem you get in life, there’re another one million people whose problems are huger than yours. 5. Your problems might just seem big and worse, but in reality they can be removed.Go about and solve your problems because every problem, however big or small, always has a way out.A. But the truth is that when you talk about it, you’re setting free the negative energies that have been gathering within you. B. When we have a problem, a pressing, critical, urgent, life-threatening problem, how do we try and solve it?C. Tell yourself: when they can deal with them, why can’t I?D. Of course, we’ve been fighting troubles ever since we were born.E. We can often overcome the problem and achieve the goal by making a direct attack.F. Having a personal diary can also be of huge help if you don’t want a real person to talk with.G. With faith and hope, you can rebuild everything that you lose.