题目

实验室制备下列气体时，所用方法正确的是( ) A．制氧气时，用Na2O2或H2O2作反应物可选择相同的气体发生装置 B．制氯气时，用饱和NaHCO3溶液和浓硫酸净化气体 C．制乙烯时，用排水法或向上排空气法收集气体 D．制二氧化氮时，用水或NaOH溶液吸收尾气 答案：A [解析] 用Na2O2和水反应制取氧气，与用在MnO2催化下分解H2O2制取氧气的发生装置相同，A项正确；饱和NaHCO3溶液显碱性，能与氯气反应，B项错误；相同条件下，乙烯的密度与空气的密度相差不大，故不能用排空气法收集乙烯，C项错误；NO2与水发生反应3NO2＋H2O===2HNO3＋NO，产生的NO仍是有毒气体，故不能用When I lived in Guangzhou, I went to La Seine every month. Now I am in Shanghai, and I have discovered that there is also a fronchise(加盟店)here. But unfortunately, the Shanghai one is very far from the Guangzhou one in terms of quality and service. The personality of the chef is key, as it impresses its mark on the choice of wines, on the menu, and more importantly on the efficiency and the dedication of the staff. The French chef, Nicolas Varnoux, previously his own boss in Paris, has been in Guangzhou for almost two years now. His passion for cooking finally led him to become the chef in La Seine, and he really manages his staff with a strong hand!Decoration: Nothing extraordinary, a slight dark but cozy atmosphere, tables not too close to each other, a few boxes allowing for some intimacy.Menu: Of course the menu is well packed, with dishes rooted in the French culinary(烹饪)tradition. The wine list includes a number of treasures, but it is possible to order wine by the glass. An interesting thing about La Seine is that they hold a buffet(自助餐) every Saturday and Sunday noon. For 96 RMB, free access to a well-stocked buffet is granted. Various soups, salads, well-chosen main courses and tempting desserts are ideally suited for inviting Chinese friends to discover French cuisine(烹饪), without taking any risk as they will always find something they like. Tea or coffee is included in the buffet price. In conclusion, I’m sure it’s a place you will want to visit again. Of course, having the chef as a friend helps, but he is such a great guy that it is easy to have a chat with him when he comes to the dining room to check if everything is okay. And he is always ready to share some little trick-of-the-trade.53. The reason why the Shanghai one is not so good as the Guangdong one is that___________.   A. the location of the Shanghai one is not satisfactory   B. it doesn’t have a good chef to manage it well   C. the price is high and the service is disappointing   D. no buffet is provided on Saturday and Sunday54. What is the meaning of the underlined word “cozy”?   A. Comfortable    B. Friendly     C. Convenient     D. Traditional55. From the passage we can infer that _____.    A. the writer likes Guangzhou more than Shanghai   B. the writer used to invite his Chinese friends to La Seine   C. the buffet price is not as expensive as the writer expected    D. the writer is fond of French food56. From the description we can imagine the personality of the French chef is__________ .   A. responsible     B. boastful     C. sweet-talking    D. ambitious57. What is the writer’s conclusion in this passage?   A. The Shanghai Franchise is inferior to the Guangzhou one    B. it is of great help to often chat with the chef   C. The La Seine restaurant in Guangzhou is worth many visits.    D. The writer doesn’t like Chinese food at all.