题干

质量相同的甲、乙、丙、丁4个小球,分别静止在水中的不同深度处,如下图所示,则这4个小球在水中所受浮力最小的是(  )

A:甲

B:乙

C:丙

D:丁

上一题 下一题 0.0难度 选择题 更新时间:2015-06-25 03:40:57

答案(点此获取答案解析)

D

同类题3

阅读下列文章,完成下列各题。

健康阅读势在必行

       ①唯有书香能致远。健康阅读可以熏陶我们的心灵,可以涵养我们的气质和自信,进而提升我们的精神境界。我国自古就有“耕读传家”的传统;而今,全民阅读工程也被列入“十三五”文化重大工程之一。

       ②然而,数字化时代,阅读陷入了令人尴尬的境地。

       ③随着数字化发展进程的加快,我们的阅读的数量的确远高于过去,但阅读的质量正面临严峻挑战。中国新闻出版研究院2016年公布的全国国民阅读调查数据显示,我国国民人均每天手机阅读时长为62.21分钟。一位网友这样讲述自己的阅读经历:“我一度沉迷于手机阅读内容上至天文,下至地理,还包含许多冷门,无厘头……我整天抱着手机,乐此不疲,浪费时间而不自觉,有时一直熬到大半夜。”这种阅读就是一种碎片化浅阅读。著名学者余秋雨说:“在信息爆炸的时代,你好像吸收了很多信息,其实更多的是信息占有了你,你失去了自我思考和价值判断的可能。”当下流行的碎片化浅阅读,追求短暂的视觉快感和心理愉悦,使人形成了一种惰性化的依赖,加剧了社会浮躁。

       ④而健康的阅读应该是形与神,心与思的对话。正如中国人民大学张鸣教授所说:“阅读能够使人充实,明理,智慧是一个人成长的阶梯。阅读更是一个国家和民族精神发育文明,传承的重要途径。”

       ⑤那么,在碎片化浅阅读风行的当下,该如何重塑健康的阅读呢?

       ⑥首先,要提倡整本书阅读。快餐式的碎片化阅读,会造成我们知识结构凌乱、松散,坚持整本书阅读能使我们的知识结构更系统、更完整、更优质,可以提升我们的阅读质量和思维水平。其次,无论是数字化阅读,还是纸质图书阅读都可以从经典开始。蜜蜂采蜜,要采花蕊中最精华的部位,读书也同理。经典之所以成为经典,是因为它是一个时代人类思想的精华。最后,要积极开展形式多样的读书活动。学校和社区要积极开展读书交流会,图书展览,经典诵读等形式多样的读书活动,为老百姓,特别是青少年学生搭建阅读的平台,营造阅读的氛围。

       ⑦我们相信当深入阅读,经典阅读得到落实,全民阅读得以实现。我们的阅读会出现更加健康的局面,到那时,阅读也将成为我们社会的一种自觉。

(根据李志雄《重构我们的阅读生态》改编)

同类题4

阅读理解

    High school plays a major role in shaping up your future and your whole development. Extracurricular (课外的) activities along with the studies can be very helpful. Make yourself take part in various activities and at the same time try to stand out in your studies. When you move out to college these efforts that you put in may count for a lot.

    High school is not just about books or classes. Schools always provide opportunities for students to socialize (社交). There are various group tasks designed which allow the students to learn to work together.

    High school is the right time for you to discover yourself and bring out some of your hidden talents. In your lessons, you may find that you are better at English than you were earlier or have grown an interest for Math. High school also provides many other opportunities for students to take part in. These help develop leadership skills and management skills at an early age, which in turn is a way of preparing students to manage and plan their careers (事业) better.

    Balancing all activities is an experience in time management. If you have taken up a part-time job along with your high school you would have to arrange your time for studies, and extracurricular activities. Such management can go a long way in teaching you to manage things better when you take up a job. Moreover, they help build your character. You would be better prepared for additional stress that you may feel sometimes.

    When at high school you should pick up your classes wisely. Depending upon what you like and your career plan you should choose suitable classes. Doing something that you hardly like may get you very low grades as well as lose valuable time. Take up interesting and challenging classes that would allow you to put in those extra efforts.