题目

小明在学习金属活动性顺序后，知道钾、钙、钠金属活动性特别强，能与水反应生成碱和氢气。他想镁紧排在钠后面，它是否也能与水反应呢?【提出问题】镁是否能与水反应?【实验探究】在两个烧杯中，分别加入等量的冷水和镁条，用酚酞指示剂。实验过程和现象如图：【反思与总结】 （1） 小明得出的实验结论是。 （2） 小明发现B试管放置空气中一会儿溶液的红色会褪色，这说明溶液的碱性减弱了。于是他大胆作出了一个猜想并设计了Dear Grandma,It is a nice sunny day in New Orleans. I’m sitting in Audubon Park and writing you this letter. It is early afternoon and I’m thinking of you. This is the best time of year in New Orleans because it is not too hot and not too cold. There are a lot of people in the park. Some are walking；some are reading books；some are riding their bikes. Are reading books；some are riding their bikes. My little brother Jeff is playing soccer with his friends.We are fine. I have a part-time（兼职的）job in a sports store, but I only work on Monday and Tuesday evenings. Jeff also has a part-time job. He works in a music store. The store sells musical instruments（乐器）. It is a really good job for him. You know that he is crazy about music ! Mom and Dad are fine. They are always busy.I hope that you are fine. How is your health, Grandma ? How is the old neighborhood ? Do my old friends still remember me ? Please say hello to them for me. Also, say hello to Uncle Jack. Please write soon. My parents and Jeff say hello.Yours,Dale1.What is Jeff doing when Dale is writing the letter ?A. Playing soccer. B. Reading newspapers.C. Riding his bike. D. Doing his homework.2.How many evenings a week does Dale work part-time ?A. One. B. Two. C. Three. D. Four.3.What does the underlined word“crazy”mean in Chinese ?A. 惊奇的 B. 厌恶的 C. 热衷的 D. 担忧的4.Why is this the best time of year in New Orleans ?A. There is a big festival B. It is in summer so people ean go swimmingC. It is not too not and not too cold D. They can play soccer with their friends5.Dale writes this letter mainly to .A. ask about the health of his grandmaB. say a big thank you to his grandmaC. tell his grandma he plans to visit her soonD. show his grandma how life is going for his family