题干

向稀硫酸中加入下列物质,溶液的 pH 没有明显变化的是(   )

A:铁

B:碳酸钙

C:氯化钡

D:氢氧化钠

上一题 下一题 0.0难度 选择题 更新时间:2018-06-05 07:01:58

答案(点此获取答案解析)

C

同类题1

阅读下面的文字,完成小题。

中国哲学家表达自己思想的方式

冯友兰

    人们开始读中国哲学著作时,第一个印象也许是,这些言论和文章都很简短,没有联系。打开《论语》,你会看到每章只有寥寥数语,而且上下章几乎没有任何联系。打开《老子》,你会看到全书只约有五千宇,不长于杂志上的一篇文章。可是从中却能见到老子哲学的全体。习惯于精密推理和详细论证的学生,要了解这些中国哲学到底在说什么,简直感到茫然。他会倾向于认为,这些思想本身就是没有内部联系吧。如果当真如此,那还有什么中国哲学。因为没有联系的思想是不值得名为哲学的。

    可以这么说:中国哲学家的言论、文章没有表面上的联系,是由于这些言论、文章都不是正式的哲学著作。照中国的传统,研究哲学不是一种职业。每个人都要学哲学,正像西方人都要进教堂。学哲学的目的,是使人作为人能够成为人,而不是成为某种人。其他的学习(不是学哲学)是使人能够成为某种人,即有一定职业的人。所以过去没有职业哲学家,非职业哲学家也就不必有正式的哲学著作。在中国,没有正式的哲学著作的哲学家,比有正式的哲学著作的哲学家多得多。若想研究这些人的哲学,只有看他们的语录或写给学生、朋友的信。这些信写于他一生的各个时期,语录也不只是一人所记。所以它们不相联系,甚至互相矛盾,这是可以预料的。

    以上所说可以解释为什么有些哲学家的言论、文章没有联系:还不能解释它们为什么简短。有些哲学著作,像孟子的和荀子的,还是有系统的推理和论证。但是与西方哲学著作相比,它们还是不够明晰。这是由于中国哲学家惯于用名言隽语、比喻例证的形式表达自己的思想。《老子》全书都是名言隽语,《庄子》各篇大都充满比喻例证。甚至在上面提到的孟子、荀子著作,与西方哲学著作相比,还是有过多的名言隽语、比喻例证。名言隽语一定很简短,比喻例证一定无联系。

    因而名言隽语、比喻例证就不够明晰。它们明晰不足而暗示有余,前者从后者得到补偿。当然,明晰与暗示是不可得兼的。一种表达,越是明晰,就越少暗示;正如一种表达,越是散文化,就越少诗意。正因为中国哲学家的言论、文章不很明晰,所以它们所暗示的几乎是无穷的。

    富于暗示,而不是明晰得一览无遗,是一切中国艺术的理想,诗歌、绘画以及其他无不如此。拿诗来说,诗人想要传达的往往不是诗中直接说了的,而是诗中没有说的。照中国的传统,好诗“言有尽而意无穷”。所以聪明的读者能读出诗的言外之意,能读出书的行间之意。中国艺术这样的理想,也反映在中国哲学家表达自己思想的方式里。

    中国艺术的理想,不是没有它的哲学背景的。《庄子》说:“言者所以在意,得意而忘言”。道家认为,道不可道,只可暗示。言透露道,是靠言的暗示,不是靠言的固定的外延和内涵。言一旦达到了目的,就该忘掉。诗的文字和音韵是如此,画的线条和颜色也是如此。

    《论语》《老子》中简短的言论,都不单纯是一些结论,而推出这些结论的前提都给丢掉了。它们都是富于暗示的名言隽语。暗示才耐人寻味。你可以把你从《老子》中发现的思想全部收集起来,写成一部新书。不管写得多么好,它也不过是一部新书。它可以与《老子》原书对照着读,也可以对人们理解原书大有帮助,但是它永远不能取代原书。

同类题3

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。

How to Prepare for Guests

    Guests are people whom we welcome sincerely and we should make sure they feel comfortable like they are in their home. Sometimes we get enough time to make preparations for guests, but sometimes we don't. This article will be beneficial for both these kinds of people. ____

    Get a bedroom for your guests. It doesn't have to be complicated. Change bed covers, clean the bathroom and you can even add a nice scented(芬芳的) candle to spice things up. These are simple things you can do even if you are a very busy person. ____

    Know what your guests' favorite foods are so that you can make for them and serve. Don't forget to note down if they are allergic to any certain kind of food to save the embarrassment(难堪). If you are among one of those people who can hardly manage the time to cook for your guests then take them to the restaurants so that they can taste new foods or enjoy their favorite ones.

    Plan activities to have a good time with your guests. ____ If they come over the weekends then plan for some indoor activities to have fun. It's also a good way to remove your tiredness from your boring life.

    ____ It can happen that you may not be able to be with your guests for a certain amount of time while they are staying in your home. In that case you must declare it to them and may have someone else to accompany them while you are absent.

    When your guests say goodbye, give them something as a token(信物) of love to remember the days they stayed with you. ____

A. Declare your absence.

B. Allow them to come and go as they please.

C. Just bear in mind everything fresh and clean will do fine.

D. If they come during the vacation then you can plan for outdoor activities.

E. Here are some ways to help you to put away things well in a short amount of time.

F. Make your guests feel even more welcome by including them in activities such as outings, or movies.

G. It can be just a photo in a beautiful frame that will remind them of beautiful moments that they spent with you.