题干

小强为了测量一幢高楼高AB,在旗杆CD与楼之间选定一点P.测得旗杆顶C视线PC与地面夹角∠DPC=36°,测楼顶A视线PA与地面夹角∠APB=54°,量得P到楼底距离PB与旗杆高度相等,等于10米,量得旗杆与楼之间距离为DB=36米,小强计算出了楼高,楼高AB是多少米?

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答案(点此获取答案解析)

解:∵∠CPD=36°,∠APB=54°,∠CDP=∠ABP=90°,

∴∠DCP=∠APB=54°,

在△CPD和△PAB中

​

∴△CPD≌△PAB(ASA),

∴DP=AB,

∵DB=36,PB=10,

∴AB=36﹣10=26(m),

答:楼高AB是26米.<

同类题2

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让文化抖落浮躁的尘埃

郭震海

    ①在一个宁静的黄昏,辞掉一切繁杂,找一个僻静之处,放松身心,读一篇好文,犹如品茗,酽香四溢,荡气回肠。读完良久,心醉神往,掩卷静思,不得不承认,这一个个独立的文字,经过作家的召唤,排列成文,可以直抵心灵,喊醒灵魂。

    ②精神的贫血比饥饿更可怕,一个人一个时代莫不如此。一篇好的作品,就是一座丰碑,可以千年不朽,万年犹新。作为人类的“精神食粮”,文学一路记载着人类的生活轨迹,如一面镜子,映照着人类的灵魂,又如一把除尘的刷子,净化着人类的心灵。然而,好作品不易得,能捧得一篇佳作是读者之幸,更是作者的至上荣耀。

    ③今天的文化场域,正迎来一个百花齐放的春天,也弥漫着功利浮躁之气。有的人或沉浸于描写一己悲欢、杯水风波,或以剪贴拼凑模仿为写作生存方式。一些图书出版,拼的不是内容质量,而是“策划”和“包装”,只求在轰轰烈烈的氛围中赚足眼球和银两,图书的实际影响无人问津。一些本该严肃认真的作品研讨会,也沾染上求名博利的风气,互相吹捧和宣传,忘记了研讨会的初衷和意义。

    ④“只有文化,才能让浮躁的社会和城市宁静下来。”文化浮躁了,灵魂的困乏和焦虑谁来救赎?急功近利不仅是对文化的伤害,更是对社会精神气质的污染。如果说文化是治愈浮躁的良药,那么文学作为文化原野上的高峰,不仅不能浮躁,还应担当起文以载道、以文化人的责任。一位文艺界人士说:“浮躁,本身就是一道障碍,只有克服,才能更好地向前。”无论如何,一个作家不能忘了握笔书写的初衷,不能推脱肩上应有的道义担当。

    ⑤“文章千古事,得失寸心知。”精益求精是优秀作家最基本的品质。曹雪芹写《红楼梦》,“披阅十载、增删五次”,所以才能“字字看来皆是血,十年辛苦不寻常”。柳青、赵树理等作家为了写一部好的作品,双脚时常沾满泥土,四季深入农村。文学说到底就是参与,参与到人民的实践中去,走到人民的生活中去,好作品的种子才能萌发出来。巴尔扎克说:“生活是最过硬的。”与生活隔离,还能写什么?

    ⑥拂去功利主义,抖落浮躁尘埃,创作确实是一项淡泊名利、远离喧嚣的心灵表达。欲作文先做人,做人必先修心,因为文由心定、文起于心。古人讲“心生而言立,言立而文明”“文如其人”“言由以生”,说的就是这个道理。心之宽度决定文之高度,思想和境界决定文风和文路。俯察古今中外,但凡名垂青史的文学大师,无不心怀万物、悲悯苍生。

    ⑦文字工作者,无疑是一项神圣光荣的职业。写作不仅仅是记录和表达。一篇好文扰如灌顶酸酬,足以让无力者有力、让蛮横者明理、让迷失者转向,也可以抚慰受伤的身心、洗涤蒙尘的心灵、唤醒沉睡的灵魂。写作是一件苦劳之事。一个真正的好作家,追求不一定多但一定很高,笔耕一生,若能孕沙成珠,留得一篇千古不朽的好文,可谓生之万幸,一生无憾。

(选自《人民日报》2015年12月24日04版,有改动)

同类题3

根据短文理解,选择正确答案。

    Peking Opera (Beijing Opera), is one of the oldest forms of dramas(戏剧) in the world. The roles(角色) in it were Sheng, Dan, Jing, Mo, Chou, Wuhang, and Longtao during its early age. But with the change of Peking Opera, there are four main roles in it today: Sheng, Dan, Jing and Chou.

    Sheng——Men Roles

    Sheng are the men roles in Peking Opera, which can be divided into Laosheng, Wusheng, Xiaosheng and Wawasheng.

    Laosheng are middle-aged or older men who are honest. Hongsheng,a type of Laosheng, have a red face. There are only two roles famous as Hongsheng. One is Guan Gong and the other is Zhao Kuangyin. Wusheng are young generals(将军) who are good at martial arts(武术). Xiaosheng are clean-shaven(没有胡须的) and handsome. Wawasheng are children's parts.

    Dan——women Roles

    Dan are women roles that can be divided into different types——Laodan, Qingyi, Huadan, Wudan and Caidan.

    Laodan play old and clever women. Qingyi are the main women roles. Huashan, a type of Qingyi, was created by Mei Lanfang, who played an important role in shaping Peking Opera. Huadan are lively and unmarried women roles. Wudan characters are women, good at martial arts. Caidan are clowns(小丑) in funny plays.

    Jing——Painted Face Men Roles

    A Jing role is an important man character with striking(吸引人的) looks and high social position. The main types of Jing are Tongchui, good at singing and usually a general; Jiazi, good at acting with less singing; and Wujing, a martial arts and acrobatics(杂技) role.

    Chou——Comedy Roles

    Chou are comedy(喜剧) roles in Peking Opera. There are Wenchou who speak, act and sing, and Wuchou who both speak and fight. What makes this type of role special is a small patch(块) of white chalk around the nose. One of the famous roles is the Monkey King, who has a special position in the hearts of all who are interested in Chinese opera.