开篇“致同学们”有这样一段文字：“对人类来说，生物学的确太重要了！现代农业离不开它，医药卫生离不开它，环境保护离不开它，生物技术产业离不开它…经济和社会的发展，人类文明的进步，个人生活质量的提高，都与生物学的发展息息相关．”结合两年所学知识，回答下列问题：

阅读下文，回答问题

要成为你自己

周国平

    ①童年和少年是充满理想的美好时期。如果我问你们，你们将来想成为怎样的人，你们一定会给我许多漂亮的回答。譬如说，想成为拿破仑那样的伟人，爱因斯坦那样的大科学家，曹雪芹那样的文豪，等等。这些回答都不坏，不过，我认为比这一切都更重要的是，首先要成为你自己。

    ②姑且假定你特别崇拜拿破仑，成为像他那样的盖世英雄是你最大的愿望。好吧，我问你：就让你成为拿破仑，生活在他那个时代，有他那些经历，你愿意吗？你很可能会激动得喊起来：太愿意啦！我再问你：让你从身体到灵魂整个儿都变成他，你也愿意吗？这下你或许有些犹豫了，会这么想：整个儿变成了他，不就是没有我自己了吗？对了，我的朋友，正是这样。那么，你不愿意了？当然喽，因为这意味着世界上曾经有过拿破仑，这个事实没有改变，唯一的变化是你压根儿不存在了。

    ③由此可见，对于每一个人来说，最宝贵的还是他自己。无论他多么羡慕别的什么人，如果让他彻头彻尾成为这个别人而不再是自己，谁都不肯了。

    ④也许你会反驳我：你说的真是废话，每个人都已经是他自己了，怎么会彻头彻尾成为别人呢？不错，我只是在假设一种情形，这种情形不可能完全按照我所说的方式发生。不过，在实际生活中，类似情形却常常在以稍微不同的方式发生着。世上有许多人，你可以说他是随便什么东西，一种职业、一种身份、一个角色，或别的什么，惟独不是他自己。如果一个人总是按照别人的意见生活，没有自己的独立思考，总是为外在的事务忙碌，没有自己的内心生活，那么，说他不是他自己就一点儿也没有冤枉他。因为确确实实，从他的头脑到他的心灵，你在其中已经找不到丝毫真正属于他自己的东西了，他只是别人的一个影子或事务的一架机器罢了。可见，真正成为自己可不是一件容易的事。

    ⑤那么，怎样才能成为自己呢？这是真正的难题，我承认我给不出一个答案。我还相信，不存在一个适用于一切人的答案。我只能说，最重要的是每个人都要真切地意识到他的“自我”的宝贵，有了这个觉悟，他就会自己去寻找属于他的答案。在茫茫宇宙间，每个人都只有一次生存的机会，都是一个独一无二、不可重复的存在。正像卢梭所说的，上帝把你造出来后，就把那个属于你的特定的模子打碎了。名声、财产、知识等等都是身外之物，人人都可求而得之，但你对人生的独特感受是没有人能够替代的。你死之后，没有人能够代替你再活一次。如果你真正意识到了这一点，你就会明白，活在世上，最重要的就是活出你自己的特色和滋味来。

    ⑥你的人生是否有意义，衡量的标准不是外在的成功，而是你对积极人生的独特领悟和坚守。坚持这一标准，你的自我才能闪放出个性的光华。

（选自《周国平文选》，略有删改）

        Millions of people all over the world use the word OK. In fact, some people say the word is used more often than any other word in the world. OK means all right or acceptable. It expresses agreement or approval.

        ____ Some people say it came from the Native American Indian tribe known as the Choctaw(乔克托语). The Choctaw word “okeh” means the same as the American word “okay”. Experts say early explorers in the American West spoke the Choctaw language in the nineteenth century.

        But many people doubt this. Language expert Allen Walker Read wrote about the word “OK” in reports published in the 1960s. He said the word began being used in the 1830s. ____ Some foreign­born people wrote “all correct” as “o­l­l­k­o­r­r­e­c­t”， and used the letters OK. Other people say a railroad worker named Obadiah Kelly invented the word long ago. They say he put the first letters of his name—O and K—on each object people gave him to send on the train.

        ____ The organization supported Martin Van Buren for president in 1840. They called their group the OK club. The letters were taken from the name of the town where Martin was born—Old Kinderhook, New York.

        Then there is the expression A­OK. It is a space­age expression. It was used in 1961 during the flight of astronaut Alan Shepard. He was the first American to be launched into space. His flight ended when his spacecraft landed in the ocean, as planned. Shepard reported, “Everything is A ­OK.” ____ One story says it was first used during the early days of the telephone to tell an operator that a message had been received.

        There are also funny ways to say okay. ____ These expressions were first used in the 1930s. Today, a character on the American television series The Simpsons says it another way. He says okely­doke.

A．Some people say okey­dokey or okey­doke.

B．Still others say a political organization invented the word.

C．Therefore, it has become popular in that area from then on.

D．But many experts don't agree on what the expression means.

E．Still, language experts do not agree about where the word came from.

F．It was a short way of writing a different spelling of the word “all correct”．

G．However, some experts say the expression did not begin with the space age.