问题 单项选择题

在深度为7的满二叉树中,叶子结点的个数为______。

A) 32
B) 31
C) 64
D) 63

答案

参考答案:C

解析: 深度为k且有2k-1个结点的二叉树,称为满二叉树。

阅读理解

阅读下列应用文及相关信息, 并按照要求匹配信息。选项中有一项是多余的。把选项的编号填写在答题纸对应位置上。

以下是咨询和服务部门的信息:

A.Career Services (Room 113)

The staff of the Career Services center advise students on career choices and applications of for higher education. They also help students and graduates apply their academic and life experiences to achieving career fulfillment, provide them with the services and resources necessary to make better informed career decisions and help them develop the skills necessary to progress their career plans.

Opening Hours: Monday through Friday: 8:30 am - 4:30 pm

Phone: (412) 396-6644 Fax: (412) 396-6644

B.The Accommodation Office ( Room 114)

The Accommodation Office is the place to find every thing concerning accommodation during your studying at this university. It offers a free advisory service and a wide range of handbooks and checklists covering the full range of housing available. In addition to this, the office also offers other services, such as the allocation of places in local residences and the provision of information regarding privately owned accommodation.

Opening Hours: Monday through Friday: 1:30 pm - 4:30 pm

Phone : (412) 396-6754 Fax: (412) 396-6752

C.Medical Center (Room 115)

The staff of the Medical Center aim to provide convenient and comprehensive medical care to students and staff of the university. The center is well equipped and the staff here are trained to deal with a broad range of medical problems. Both female and male doctors as well as nursing staff are available for consultation. Also, all kinds of medicines are sold here and are cheaper for students than other drugstores.

Opening Hours: 24 hours from Monday to Sunday

Phone : (412) 396-6649 Fax: (412) 396-6648

D.The Sports Office (Room 207)Sport and recreation play an important role in the lives of students. The university has lots of indoor and outdoor sports facilities and all students are encouraged to participate in some form of sport and recreation. This office can provide information about sporting and activities to keep you fit.

Opening Hours: Monday through Friday: 7:00am - 10:00pm

Phone : (412) 396-6877  Fax: (412) 396-6876

E. Food Service (Room 127)

Tasty, nutritious meals and a wide variety of snacks are available from the cafeterias on campus. Maybe you are not familiar with different cafeterias here and find it difficult to get a good meal. Don’t worry! The Food Service can provide you with specific information on the food available here and offers meal plans based on your individual needs.

Opening Hours: Monday through Friday: 2:30pm - 5:30pm

Phone: (412) 396-6899  Fax: (412) 396-6890

F. Library (Room 215)

There are various books and reference materials in every subject here including literature, art and math. Besides books, there are also photo-copying, video, audio-visual and computing facilities. Our collection is big and our main task is to help you solve problems on making use of the library.

Opening Hours: Monday through Friday: 8:30am - 5:30pm

Phone: (412) 396-6312  Fax: (412) 396-6706

以下是大学生的信息,请匹配大学生与他们要选择的服务部门:

1. Richard is a foreign student majoring in medicine. He can adjust himself to the weather but he is having a lot of difficulties in getting used to the diet at the college cafeterias.

2. John is fond of sports. He plays football every day.  Unfortunately, he injured his leg while he was playing this morning. He urgently needs some medical help.

3. Lucy is new student from Washington, and she often arrives at the college late since she lives far away from the university, so she desperately needs to find a new place to live in.

4. Alice is going to leave university next year. She is preparing her papers and has to do a lot of research. She would like to find books on literature and learn how to use the audio-visual facilities.

5. Rosemary studies in the department of computer science. She is really interested in this field, so she plans to be engaged in this booming industry after her graduation, but before she makes a final decision, she wants to consult experienced teachers.

阅读理解与欣赏

母亲的来信                 

[苏]克拉夫琴科

  母亲来信了。

  在初来城里的日子里,文卡总是焦急地等待着母亲的信,一收到信,便急不可待地拆开,贪婪地读着。半年以后,他已是没精打采地拆信了,脸上露出讥诮的冷笑--信中那老一套的内容,不消看他也早知道了。母亲每周都寄来一封信,开头总是千篇一律:“我亲爱的宝贝小文卡,早上(或晚上)好!这是妈妈在给你写信,向你亲切问好,带给你我最美好的祝愿,祝你健康幸福。我在这封短信里首先要告诉你的是,感谢上帝,我活着,身体也好,这也是你的愿望。我还急于告诉你:我日子过得挺好……”每封信的结尾也没有什么区别:“信快结束了,好儿子,我恳求你,我祈祷上帝,你别和坏人混在一起,别喝伏特加,要尊敬长者,好好保重自己。在这个世界上你是我唯一的亲人,要是你出了什么事,那我就肯定活不成了。信就写到这里。盼望你的回信,好儿子,吻你,你的妈妈。”因此,文卡只读信的中间一段。一边读一边轻蔑地蹙起眉头,对妈妈的生活兴趣感到不可理解。那尽是些鸡毛蒜皮的事,什么邻居的羊钻进了帕什卡·沃罗恩佐的园子里,把他的白菜全啃坏了;什么瓦莉卡·乌捷舍娃没有嫁给斯杰潘·罗什金,而嫁给了科利卡·扎米亚金;什么商店里终于运来了紧俏的小头巾,——这种头巾在这里,在城里,要多少有多少。文卡把看过的信扔进床头柜,然后就忘得一干二净,直到收到下一封母亲泪痕斑斑的来信,其中照例是恳求他看在上帝的面上写封回信。……

  文卡把刚收到的信塞进衣兜,穿过下班后变得喧闹的宿舍走廊,走进自己的房间。今天发了工资。小伙子们准备上街:忙着熨衬衫、长裤,打听谁要到哪儿去,跟谁有约会等等。文卡故意慢吞吞地脱下衣服,洗了澡,换了衣。等同房间的人走光了以后,他锁上房门,坐到桌前。从口袋里摸出还是第一次领工资后买的记事本和圆珠笔,翻开一页空白纸,沉思起来……恰在一个钟头以前,他在回宿舍的路上遇见一位从家乡来的熟人。相互寒暄几句之后,那位老乡问了问文卡的工资和生活情况,便含着责备的意味摇着头说:“你应该给母亲寄点钱去。冬天眼看就到了。家里得请人运木柴,又要劈,又要锯。你母亲只有她那一点点养老金……你是知道的。”文卡自然是知道的。他咬着嘴唇,在白纸上方的正中仔仔细细地写上了一个数字:126,然后由上到下画了一条垂直线,在左栏上方写上“支出”,右栏写上“数目”。他沉吟片刻,取过日历计算到预支还有多少天,然后在左栏写上:12,右栏写一个乘号和数字4,得出总数为48。接下去就写得快多了:还债——10,买裤子——30,储蓄——20,电影、跳舞等——4天,l天2卢布——8,剩余——10卢布。文卡哼了一声。10卢布,给母亲寄去这么个数是很不像话的,村里人准会笑话。他摸了摸下巴,毅然划掉“剩余”二字,改为“零用”,心中叨咕着:“等下次领到预支工资再寄吧。”他放下圆珠笔,把记事本揣进口袋里,伸了个懒腰,想起了母亲的来信。他打着哈欠看了看表,掏出信封,拆开,抽出信纸。当他展开信纸的时候,一张三卢布的纸币轻轻飘落在他的膝上……(江苏文艺出版社《微型小说选》,杨实译)

1.请用简明的词语概括文卡这一人物形象特点。

 _________________________________________________

2.文卡对母亲来信的情感经历了一个怎样的变化过程?为什么会有这个变化?

 _________________________________________________

3.作者在文中安排文卡路遇家乡熟人这一情节,其用意是什么?

 _________________________________________________

4.请简要赏析“当他展开信纸的时候,一张三卢布的纸币轻轻飘落在他的膝上……” 这一结尾的精妙之处。

 _________________________________________________