关于1954年颁布的《中华人民共和国宪法》的表述，正确的是
①规定了国家的性质和根本的政治制度②体现了人民民主和社会主义原则

③总结了社会主义改造完成的经验④是新中国第一部社会主义类型的宪法

    Barbara McClintock was one of the most important scientists of the twentieth century. She made important discoveries about genes（基因）and chromosomes（染色体）.

    Barbara McClintock was born in 1902 in Hartford, Connecticut. Her family moved to the Brooklyn area of New York City in 1908. Barbara was an active child with interests in sports and music. She also developed an interest in science.

    She studied science at Cornell University in Ithaca, New York. Barbara was among a small number of undergraduate students to receive training in genetics in 1921. Years later, she noted that few college students wanted to study genetics.

    Barbara McClintock decided to study botany, the scientific study of plants, at Cornell University. She completed her undergraduate studies in 1923. McClintock decided to continue her education at Cornell. She completed a master's degree in 1925. Two years later, she finished all her requirements for a doctorate degree.

    McClintock stayed at Cornell after she completed her education. She taught students botany. The 1930s was not a good time to be a young scientist in the United States. The country was in the middle of the great economic Depression. Millions of Americans were unemployed. Male scientists were offered jobs. But female geneticists were not much in demand.

    An old friend from Cornell, Marcus Rhoades, invited McClintock to spend the summer of 1941 working at the Cold Spring Harbor Laboratory. It is a research center on Long Island, near New York City. McClintock started a temporary（临时的）job with the genetics department. A short time later, she accepted a permanent（永久的）position in the laboratory. This gave her the freedom to continue her research without having to teach or repeatedly ask for financial aid.

    By the 1970s, her discoveries had had an effect on everything from genetic engineering to cancer research. McClintock won the Nobel Prize for Physiology or Medicine in 1983 for her discovery of the ability of genes to change positions on chromosomes. She was the first American woman to win an unshared Nobel Prize.

计算：$\sqrt{9}$+|﹣5|﹣（2﹣$\sqrt{3}$）⁰．

    ①在现代社会，网络、手机、电视等传播媒介，极大改变了人们的阅读习惯。人的身体从书斋里解放出来，整个世界都成了书房。与此同时，阅读也变得越来越简单随意，看时一目十行，看后过目即忘——人们常说的“浅阅读”逐渐风行起来。

    ②传播媒介变了，阅读习惯也随之改变，这无可厚非。读书从来都有不同类别，何况“读”总比“毒”和“赌”好，毕竟它能获取信息、提升修养。但是，如果一种拒绝深度的浅阅读借助于媒介的力量，逐渐演化成社会上大多数人尤其是年轻一代的阅读习惯时，我们是否该有所审视？

    ③阅读之深浅，并非小事。往小里说，涉及个人生活方式，往大处讲，涉及社会风尚和全民族的文化倾向。科技的发达，资讯的浩繁，并不能成为远离深阅读的借口。历史上很多名人，并不苛求读书之多，却强调读书之深。唐宋八大家的韩愈自述所服膺之书不过数种。清代名臣曾国藩反复强调读书要专，“穷经必专一经，不可泛鹜”，“但一部未完，不可换他部，此万万不易之道”。古人讲究读书譬若掘井，与其多掘数井而不及泉，不如专守一井，力求及泉，而用之不竭。当然，一味艰深不免乏味，但是一股脑跟风“浅阅读”，则终会流于浮泛。

    ④我相信，如果沉迷于新潮时尚、“触手可及”的手机阅读、广告阅读、网络阅读，这个社会能够造就千千万万个信息受众，但是很难培育精深广博的大家。当然，这里并非要提倡复古读经，也不是强求每个人都去做名人大家，而只是为时下偏颇式的阅读状况担忧，为人们对这样的阅读习惯习焉不察而担忧。阅读可以是休闲、娱乐，但不应止于休闲、娱乐，尤其是对于整个国民而言。

    ⑤从另一角度来说，人类文明长河存在无数经典，不少作品的孕育时间与创作艰辛都令人慨叹。《红楼梦》披阅十载，增删五次，               这些作品呼唤代代后人不断重读，温故知新。它们的厚重与丰富，也注定了阅读的艰难与沉潜，这是浅阅读无法涉足的领域。曾有人在网上搞所谓的世界经典名著快读，把每部名著概括成几十个字的故事梗概，以为这样可以花最少的时间，读最多的名著，简直可以算得上心浮气躁的典型例子。

    ⑥对于不以读书、研究为业的人来说，“浅阅读”未尝不可，但对于整个社会，对于传统文化的传承和民族素质的提升，深阅读万不可废。如果有一天，国人全都沉迷于摩尔庄园、偷菜游戏、手机短信和QQ聊天，那么这还是不是我们？