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     World Book Day falls on April 23 every year. It was set up by the UNESCO(联合国教科文组织) in 1995 to encourage people, especially teenagers, to discover the pleasure of reading. It is also the day to honor great writer, for example, William Shakespeare, born or dead on that day.
       Many countries celebrate World Book Day. Take UK as an example. On that day, millions of school children can buy books of special price, a much lower price than usual, in any bookstore. It has been done every year since 1998. World Book Day is also celebrated in China. Premier Wen Jiabao does lots of reading every day. Wen has called on people to do more reading. He suggested that young people should spend more time reading. “Book cannot change the world, but people can change the world by changing themselves through reading,” he said.
    Why do people like reading? One big advantage is that reading helps us become more knowledgeable and more intelligent. Also, reading helps us to follow the latest developments of science and technology. Besides, reading gives us information about other cultures and places of the world. When we read, we may find many things that are unfamiliar to us. We would have to use our brain to think about them or do more reading to find out the answers. The more we read, the more we know. What's more, reading is also one of the most important ways to learn a foreign language like English.
   “Reading makes a full man”. Books, magazines, newspapers and other kinds of materials can help us to know more about the outside world and perf

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生命的礼物(节选)

    那年,我在美国考得驾驶执照,领取时又发给我一张淡红色的小卡,卡上写着:按照统一的人体捐献法规,当我死亡时,我作如下选择:A捐献我的任一器官和部件;B捐献我的心脏起搏器官(植入日期为某年某月某日);C捐献下列部件和器官……D不捐献我的任一器官部件和心脏起搏器。以下是亲笔签名和日期。

    真新鲜!要是我母亲见了,一定大惊失色。我在A项作了选择,就是说,一旦发生意外死亡,我愿意捐献我的任何一个器官和部件,我签上自己的大名,把那张淡红色小卡贴在驾驶执照后面,并把“捐献者”三个字的小红点贴在驾驶执照正面。这是一份生命的礼物,赐予和被赐予都是一种幸福。我不曾将此事告诉母亲,怕她整天提心吊胆。

不久前,在一份杂志上读到一篇文章:一位美国青年在一场车祸中不幸丧生,根据他生前的愿望,医生摘取了他身上所有可供利用的器官,移植给了他人。这位青年捐赠的生命礼物使四个垂死者重获新生,两个盲人重见光明。当记者访问这个青年母亲时,她说,为儿子的行为感到骄傲,同时她还感谢那些接受她儿子器官的人,他们使她儿子的一部分在他们体内存活,她儿子的生命以另一种形式得以延续;看到他们,就像看到自己的儿子!

    我把文章拿去读给我80岁的母亲听,她听了半晌不说话,最后她缓缓地说   这个母亲实在了不起  只是  我这样老的器官不知还能不能派上用场   我激动地一把抱住她   你真是我的好妈妈  

化学概念在逻辑上存在如图所示关系，对下列概念间的关系说法正确的是（   ）