一个非0的自然数除以15，结果比原数增加了4倍______． 发布时间：2017-06-11 22:00 │ 来源：www.tikuol.com 题型：解答题 问题： 一个非0的自然数除以15，结果比原数增加了4倍______．
题型：解答题 阅读下列短文，从每题所给的A、B、C和D项中，选出最佳选项。 Arguing with your parents is very natural for teens. From your hairstyle to your friends, your marks at school to your television habits, it might just seem like you argue with your parents about everything. Though this is not pleasant, it is normal and it will most possibly pass. At the same time, remember to argue fairly, respectfully (尊重地) and argue only when needed. It might be hard to stay in control while arguing with parents, but it will do you a lot of good. Arguments between teens and parents generally come about when both parties believe that they knowwhat is best. Parents have been caring for their teens for over ten years, but teens are quickly becoming adults and believe that they are able to take care of themselves. If you are a teen arguing with your parents, rememberthat your parents love you and only want what is best for you. If you must argue with them, argue fairly, respectfully by: ▲Letting each person in the argument to speak what they want to say. ▲Refusing to break in others when they are speaking. ▲Only Arguing about the topic at hand. Don't talk about past hurts. ▲Showing your parents that you have thought about the issue (事情) and are trying to sort things for yourself. There is a small difference between having a discussion and an argument, but smart teens know that having a discussion with their parents will make things easier. Arguing with parents is usually a hallmark (标记) of the teenaged years, but out of control arguments don't serve anyone well. Before arguing with your parents, decide what type of teen you want to be and what you are willing to do in order to achieve your goals. 1. Why do teens argue with their parents according to the writer? [ ]A. Parents and teens have different ideas of what is best. B. Parents don't want their children to grow up. C. Teens don't need their parents' care any more.D. They have different habits. 2. When arguing with parents, teens should do the following EXCEPT__________. [ ]A. Let both sides tell what they want to say. B. Show your parents that you have considered the things carefully. C. Keep yourself in control. D. Tell your parents that they have often hurt you before. 3. The underlined word"sort" probably means _____________ [ ]A. 处理 B. 类别 C. 占据 D. 放好 4. We can learn from the passage that_________________. [ ]A. having a discussion is better than arguing with parents. B. the arguments between parents and teens will not possibly pass.C. teens will not lose control when arguing with their parents. D. teens should decide whether their parents love them before arguing. 5. What is the best title for the passage? [ ]A. Teens and parents B. Discussion with teens C. Arguing with parents D. Teenaged years 查看答案
题型：解答题 傅瑞德尔-克拉福茨反应是在苯环上引入烷基的反应，例如： ，乙苯还可发生下列反应： + H2↑。已知烯烃在发生加成反应时，加成试剂HA中的氢总是加在含氢较多的不饱和碳上：R-CH= CH2+HA→R-CH(A)-CH3。试以电石、苯为原料制备 ，写出各步反应的化学方程式________________。 查看答案
，
+ H2↑。
，写出各步反应的化学方程式________________。