题干

函数f(x)= 1−2x +
1
x
+
3
的定义域为(   ).

A:(-3,0

B:(-3,1

C:(-∞,-3)∪(-3,0

D:(-∞,-3)∪(-3,1

上一题 下一题 0.0难度 选择题 更新时间:2019-07-11 01:43:26

答案(点此获取答案解析)

A

同类题1

阅读下面的文字,完成下面小题。

    在今日市场经济的环境中,诚信的缺失——以及随之而来的信任的缺失——已是一个公认的事实。

    其原因还得从我们自己身上寻找。现在有些人把诚信的缺失归咎于市场经济,这种认识水平比起严复来不知倒退了多少。

    其实,诚信的缺乏正表明中国的市场经济尚不够成熟,其规则和秩序未能建立健全并得到维护。而之所以如此,近因甚多也甚复杂,远因一定可以追溯到文化传统和国民素质。西方人文传统中有一个重要观念,便是人的尊严,其经典表达就是康德所说的“人是目的”。按照这个观念,每个人都是一个有尊严的精神性存在,不可被当作手段使用。一个人怀有这种做人的尊严感,与人打交道时就会有一种自尊的态度,仿佛如此说:这是我的真实想法,我愿意对它负责。这就是诚实和守信用。他也会这样去尊重他人,仿佛如此说:我要知道你的真实想法,并相信你会对它负责。这就是信任。可见诚信和信任是以彼此共有的人的尊严之意识为基础的。相比之下,中国儒家的文化传统中缺少人的尊严的观念,因而诚信和信任就缺乏深刻的精神基础。

    也许有人会说,“信”在儒家伦理中也占据着重要的位置。不错,孔子常常谈“信”,《论语》中论及诚实守信含义上的“信”就有十多处。但是,在儒家伦理系统中,“信”的基础不是人的尊严,而是封建等级秩序。所以,毫不奇怪,孔子常把“信”置于“忠”之后而连称“忠信”,例如“主忠信”“言忠信”“子以四教:文,行,忠,信”等。可见“信”是从属于“忠”的,诚实守信归根到底要服从权力上的尊卑和血缘上的亲疏。在道德实践中,儒家的“信”往往表现为所谓仗义。仗义和信任貌似相近,实则属于完全不同的道德谱系。信任是独立的个人之间的关系,一方面各人有自己的人格、价值观、生活方式、利益追求等,在这些方面彼此尊重,绝不要求一致,另一方面合作做事时都遵守规则。仗义却相反,一方面抹杀个性和个人利益,样样求同,不能容忍差异,另一方面共事时不讲规则。在中国的商场上,几个朋友合伙做生意,一开始因为哥们儿义气或因为面子而利益不分,规则不明,最后打得不可开交,终成仇人,这样的事例不知有多少。

    毫无疑问,要使诚信和信任方面的可悲现状真正改观,根本途径是发展市场经济,完善其规则和秩序。不过,基于上述认识,我认为同时很有必要认真检讨我们的文化传统,使国民素质逐步适应而不是严重阻碍这个市场经济健全化的过程。

(摘编自周国平《诚信、信任和人的尊严》)

同类题4

阅读理解

    When I recently revealed to my friends, colleagues, and family members that I would be moving my family to Israel, the reactions were numerous and varied. Some people said it was an expected thing while others asked: Why now? What will you do?

    For me, making the move to Israel is the fulfillment of a dream that has lasted for my 47 years of life. I have always known that Israel is my home. Over the years Israel has been in my heart, but I have found a number of reasons to put off making it my permanent residence: kids, the economy, education… you name an excuse, and at some point I have probably used it.

    Truthfully, I believe that I was always just a little bit scared. And of course I still am, with the fear factor that is reported by the press surrounding the Israeli military and economy. However, it has come to the point when I have realized that for over 2000 years we have longed for this land, and that for 47 years I have denied the opportunity to make it my home. I am finally ready to fully grasp this opportunity.

    Over the years, I have always loved visiting Israel. I have traveled there with my family, and enjoyed introducing thousands of travelers to the country. I have come to love all of these things about Israel as a tourist because I get to love my home. And as far as waiting for the “perfect” condition under which to make aliyah, I believe the time is now!

    I have been asked many times if I am nervous about moving to Israel. Before I answer, I remember that we have overcome the Greeks, the Romans, the Russian killings, Hitler and the Holocaust(大屠杀),and the armies of seven countries.

    How can I not feel confident that I , and my family, will overcome any difficulties that may come our way? I am not worrying, complaining, crying, or fearing as I prepare to make aliyah. I am proud and excited to say that I am fulfilling a 47-year-old dream: I am going home.