题目

对下面四个常见的化学反应进行对比分析： 分解反应：2KMnO4K2MnO4＋MnO2＋O2↑ 置换反应：2CuO＋C2Cu＋CO2↑ 复分解反应：Ca(OH)2＋Na2CO3===CaCO3↓＋2NaOH 化合反应：2H2＋O22H2O 请从以下各项中选择恰当的内容，用对应的序号填空： ①元素的种类；②原子的种类；③原子的个数；④分子的种类；⑤物质的组成(或结构)；⑥物质的总质量；⑦元素的化合价。 在化学反应过程中，一定发生变化的是____；可能发生变化的是____。Winners ClubYou choose to be a winner!The Winners Club is a bank account specially designed for teenagers. It has been made to help you better manage your money. The Winners Club is a transaction account（交易账户）where you receive a key-card so you can get to your money 24/7 – that’s 24 hours a day, 7 days a week!It’s a club with impressive features for teenagers:No account keeping fees!You’re no millionaire so we don’t expect you to pay large fees. In fact, there is no account keeping or transaction fees!Excellent interest rates!You want your money to grow. The Winners Club has a good rate of interest which gets even better if you make at least two deposits（储蓄）without taking them out in a month.ConvenientTeenagers are busy – we get that. You may never need to come to a bank at all. With the Winners Club you can choose to use handy tellers and to bank from home using the phone and the Internet－You can have money directly deposited into your Winners Club account. This could be your pocket money or your pay from your part-time job!Mega magazine includedAlong with your regular report, you will receive a FREE magazine full of good ideas to make even more of your money. There are also fantastic offers and competitions only for Winners Club members.The Winners Club is a great choice for teenagers. And it is so easy to join. Simply fill in an application form. We can’t wait to hear from you. It’s the best way to choose to be a winner!1.Which of the following is TRUE about the Winners Club?A. Special gifts are ready for parents.B. The bank opens only on work days.C. Services are convenient for its members.D. Fees are necessary for the account keeping.2.The Winners Club provides magazines which ________.A. encourage spending B. are free to all teenagersC. are full of adventure stories D. help to make more of your money3.What is the purpose of this text?A. To set up a club. B. To provide part-time jobs.C. To organize key-cards. D. To introduce a new banking service