血红蛋白的特性决定了红细胞的主要功能是（    ）

Hi, everybody!
    Welcome to our newly-opened Richards Cinema Bookstore!
    Now let me introduce to you some of the new film books in our store.
Are you Chinese film fans? OK, here comes the latest 25 New Takes about Chinese films. It is a collection of 25 fresh readings of different Chinese films from the 1930s to the present. In recent years, Chinese films are very popular in the States, such as Crouching Tiger and Hidden Dragon, Hero, and Flowers of Shanghai.
    Do you like French films? Well, here is The French Cinema Book. It covers French films from the 1890s to the beginning of the 21st century. It is written for all lovers of French cinema: students and teachers, specialists and fans, and so on.
    Maybe you are Indian film fans and star-chasers. Then here is Encyclopedia (百科全书) of Indian Cinema. The book is a complete introduction to all the best Indian films. It also offers a full list of names of the famous and successful film stars in the past ten years. You know, the Indian film industry is the largest in the world after our Hollywood.
    If you like British films, we have The British Cinema Book. It is a good review of British cinema. This book contains a good many nice pictures.
    In our bookstore, you can also find books about Mexican, Japanese, Australian, German and Italian films.
Well, please help yourselves to some coffee or tea, and have a good time here!

邓小平是新中国元勋。清明节期间广安某班开展了“纪念家乡伟人——邓小平”的主题班会活动，以下是学生搜集到的一些资料，通过问题设置探究了解伟人的主要事迹，请你与该班同学一起探究。

材料一：1978年，已经74岁的邓小平成为党的第二代领导集体核心。在他的带领下，实现了新中国成立以来党的历史上的伟大转折，中国人民从此走上了一条全新的道路。

材料二：1992年1月至2月，邓小平视察武昌、上海等地，发表了重要谈话，强调必须坚持“一个中心，两个基本点”的基本路线。他认为“发展才是硬道理”……针对当时影响改革开放的主要思想障碍是担心“走了资本主义道路”，邓小平明确提出判断姓“资”姓“社”的三条标准，即“三个是否有利于”……

材料三：1982年邓小平会见英国首相撒切尔夫人时说：“主权问题是不可以讨论的问题，1997年中国将收回香港。收回的不仅是新界，而且包括香港岛和九龙。”

材料四：广东省委主要负责人忐忑不安地汇报了逃港（逃往香港）情况后，邓小平出奇地沉默了很长时间说：“这是我们政策有问题。逃港主要是生活不好，差距太大，生产生活搞好了，才可以解决逃港的问题。”

武汉位于中国的长江、汉江交汇处，历史上由武昌、汉口、汉阳三镇组成，故称“武汉三镇”。武汉的城市地名浓缩了一部中国近现代史。武汉崛起于风云激荡的时代，武汉也就深深地打上了时代的烙印。

下列各组物质中都属于纯净物的是（）