题干

硼及其化合物在工业上有许多用途。以铁硼矿(主要成分为Mg2B2O5·H2O和Fe3O4,还有少量Fe2O3、FeO、CaO、Al2O3和SiO2等)为原料制备硼酸(H3BO3)的工艺流程如图所示:

回答下列问题:

上一题 下一题 0.0难度 选择题 更新时间:2014-05-23 03:04:16

答案(点此获取答案解析)

同类题1

阅读下面的文字,完成文后各题。

中国新诗为何处境“尴尬”

    ①中国是诗歌的王国,从商周的四言,到楚骚汉赋、汉魏乐府、隋唐律绝和宋词元曲,可谓灼灼其华,蔚然大观。千百年前的黄钟大吕,至今犹萦绕在苍穹。然而中国新诗在诞生近百年后的今天,却遭遇了前所未有的尴尬:它既没能与国际接轨,又与中华古典诗词曲赋的优良传统脱节、断裂,割断了传承关系,令广大读者望其兴叹,最后只好弃之而去。中国新诗为何会处境“尴尬”呢?

    ②首先,是由白话新诗至今未能构建审美规范更无法达成审美共识造成的。无论是《诗经》中的“风雅颂”,还是楚辞、乐府、律诗、宋词、元曲……不论其诗体形式怎么演变,但都是讲究韵律的,作品都具有节奏美、旋律美和韵式美。由于白话“新诗”“不拘格律,不拘平仄,不拘长短”(胡适《谈新诗》)的随意性和不确定性,自其诞生以来,便成为其发展的严重弊端和障碍。

    ③其次,是由某些诗人一味地强调诗体形式而忽略主题思想造成的。诗歌是文学形式美的一种体现,但形式美只是诗歌的美丽外衣而已。过分地强调诗体形式,从而否定主题思想的意义,如近年来所谓的技术主义、玄学派、立体主义、构成主义、达达主义、超现实主义、未来主义等,就像失去了土壤的禾苗一样,必将枯萎。

    ④最后,是由当代诗人在商品经济时代的退缩和自闭造成的。同古典诗词曲赋相比,当代诗歌在题材内容方面发生了较明显的变化:其一,迫于现实社会生存的巨大综合压力和人类因物质文明进步而带来的精神困惑,当代诗歌的内容越来越局限于私人性的东西,正日愈失去处理重大社会题材的艺术能力,这就使得它日愈减少获得公众关注的机会,而只有在少数未被现代社会物质化的心灵当中获得知音;其二,随着诗人们从社会文化中心退却,科技英雄和商业英雄、娱乐英雄取代了艺术家的中心地位,诗歌越来越被推挤到社会的边缘,诗人们成了一个不被社会关注的自我封闭、自我肯定、自我满足、自我安慰、自我陶醉的奇怪群体,这更加加剧了他们的自闭倾向;其三,当诗人们精神的价值已经从崇高、纯洁、美好、自然过渡到了喧嚣、乐趣、庸俗、时尚的方向,于是平庸困扰着诗歌界,诗歌的阵地越来越虚弱。

    ⑤面对这样的时代背景,中国新诗只有志存高远,发扬其应有的精神文化提升作用,既在主题内容方面深度切入自己的时代,又在诗艺表现方面继承并发扬光大中华传统诗词曲赋艺术,随时代、社会、语言的变化而不断创新改进,让中国新诗界尽快构建审美规范并早日达成审美共识。这样,中国新诗才能够既有技艺的美感,又有时代的气息,还有历史文化的内涵,并因此而融入中华诗歌的历史长河之中,从而有机会成为新时期的经典诗歌作品而流传于世。

(选自《长空诗话》,有删改)

同类题5

根据短文内容,从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

    Taking good notes is a time-saving skill that will help you to become a better student in several ways ____.Second, your notes are excellent materials to refer to when you are studying for a test. Third, note-taking offers variety to your study time and helps you to hold your interest.

    You will want to take notes during classroom discussions and while reading a textbook or doing research for a report. ____ Whenever or however you take notes, keep in mind that note-taking is a selective process. ____

    The following methods may work best for you.

●Read the text quickly to find the main facts and ideas in it.

●Carefully read the text and watch for words that can show main points and

supporting facts.

● Write your notes in your own words.

____

● Note any questions or ideas you may have about what was said or written.

    As you take notes, you may want to use your own shorthand(速记). When you do, be sure that you understand your symbols(符号) and that you use them all the time. ____

A.Use words, not complete sentences.

B.There are three practical note-taking methods.

C.You must write your notes on separate paper.

D.Otherwise, you may not be able to read your notes late

E. you will also want to develop your own method for taking notes.

F. That means you must first decide what is important enough to include in your notes.

G. First, the simple act of writing something down makes it easier for you to understand and remember it.