题目

两份铝屑，一份与过量HCl反应，另一份与过量NaOH溶液反应，产生的H2体积比为1:2，则两份铝屑的质量比为（     ） A. 1:2            B. 1:1                C.1:3                D.2:1 答案：答案】A 【解析】铝和酸碱反应比值都是2Al-----3H2  ,产生的H2体积比为1:2，则两份铝屑的质量比为1:2What’s the most important thing for you to have in your life? Somebody mentions hard-work, others suggest knowledge, love and luck. If you arrange（排列） the 26 English letters in order and use numbers to represent each of them, for example, 1 for a, 2 for b, 3 for c…26 for z, you can change an English word into a number. So hard-work becomes 8+1+18+4+23+15+18+11=98, meaning 98 is its mark. Knowledge: 11+14+15+23+12+5+4+7+5=96, love:12+15+22+5=54, and luck: 12+21+3+11=47, a small mark. None of these words can give one a full mark. What about money? It can’t, either. Then what else? Don’t be worried. You can always find an answer to a problem in your life, when you change your way of looking at things or doing things, or your attitude. Yes, attitude is the word. See for yourself: attitude:1+20+20+9+20+21+4+5=100，a full mark. Different attitudes lead to different courses of life. Most time people hope for a better life. It is possible that they will have a better life if they change their attitudes. When you change your manner and became friendly towards others, you’ll meet more smiling faces towards you. In the same way, if you take a positive attitude towards failure, you’ll find it’s also rewarding（有益的）though it has caused you losses（损失）. 1.The writer thinks  _________ is the most important thing in a person’s life. A. hard-work.           B. knowledge             C. money           D. attitude 2.What is the mark of the word money according to the passage? A. 73             B. 72           C. 75           D. 62   3.According to the passage, if you meet with problems, the best way is to ___________. A. ask for help from others                        B. hope to be lucky C. change your attitude                            D. try math-solving ways 4.From the passage we can learn that ______________.   A. different attitudes come from different courses of life B. sometimes failure can bring you good if you take a positive attitude   C. math can solve every problem easily in our daily life   D. none of the English words except “attitude” is 100 or more