网络教育应用基础第一次作业 (1)
网络教育应用基础第一次作业
姓名：苏敏学号：113CZ4001
专业：计算机应用技术所在教学中心：福建广播电视大学龙海工作站校外学习中心1．网络教育与传统的教育相比，有那些显著的特点? 请结合加以进一步的阐述。
答：网络是巨大的教育资源库，并且能够实现资源的共享。
资源对教育的重要性是不言而喻的。
没有资源，巧妇难为无米之炊。
网络信息资源的丰富性为学习者提供了取之不竭的宝库。
在网络教学系统中存储着大量数据、档案资料、程序、教学软件、兴趣讨论组、专家组等各种教学信息，而网络中的每个学习者可以共享各种信息资源，这是其它任何一种媒体和技术手段所无法做到的，“网络教学信息由教育专家、优秀教师和计算机人员共同开发的，学生可以得到任何一个国家和地区、任一学科和领域的知识信息，得到世界上任一位专家学者的指导，使每一位学习者都能得到均等的受教育的机会，不再会受到学校水平、教材、教师能力的限制”，在网络教育中，许多优秀教育工作者总结多年教育教学经验，运用多媒体等现代教育手段，精心设计并制作各种学科的多媒体CAI (计算机辅助教学)软件，并把它应用于教育教学中，教育由此开始了新的篇章。
教师可以在网络上建立专门的网点，任何人可以在任何地点通过网络访问，学习此CAI软件，节省了CAI的交流时间，更充分发挥了CAI的教学优势，节省了资金并提高了教学效率。
随着信息技术的发展，将出现越来越多的信息库，一个覆盖全球的网络可以把全世界的学校、研究所、图书馆和家庭统统联系起来。
另外计算机网络上还有各种信息媒体，如网上图书馆和网上书店等。
网络和信息高速公路的大发展，将使全世界的大大小小的信息库和每一网上电脑实际上都成为可能的信息源泉。
2．你为什么要报名参加福建师范大学网络教育学院的学习?
答：(1)特网信息传播速度迅速，无地域国界的限制，特别适合于进行远距离的教学。
(2)信息传播方式灵活。
在因特网中，除了浏览信息以外，还可以采用电子邮
件、远程登陆、文件下载、电子公告栏多种方式来进行。
使得因特网中远距离教学的形式可以多种多样。
(3)国际统一的传输标准使得各地均能采用统一的传输方式。
由于标准化工作做得比较好，因此因特网不像电视等媒体那样出现各种各样的标准，给资料的交流带来了很大的不便。
(4)网络的适应性强，不会因局部的损坏而终止整个网络信息的传输。
(5)同长途电话相比，信息传输费用更低。
(6)因特网不会像电视那样占用宝贵的频率资源，因而就不会出现一门课程每天只能使用十几分钟电视播放时间的限制。
(7) 资源非常丰富，教师可以学生提供更多的素材，包括指导学生对其它网址的访问。
学生不出户即可搜寻到各种各样的学习参考资料。
(8) 利用因特网进行教学时，学生处于个别化、交互式的学习状态，大大提高了教学效率。
(9) 学生个人可以在教师开辟的公共讨论区发表自己的见解，使整个网络教学过程能够形成一种讨论的气氛，教师也可以与学生讨论，开展启发式教学。
(10) 教师还可以利用因特网进行计算机管理教学，包括将学生有关的个人资料、评价情况等利用计算机来进行处理。
教师甚至可以将学生每堂课的学习情况都记录在他的档案里，大大提高了评价的准确性。
3．网络教育讲授方式可分为同步式与异步式两种，请你谈谈同步式讲授与异步式讲授的优缺点。
答：1.同步式讲授在这种教学模式中，教师和学生虽然在空间上市分离的，即不在同一地点上课，但在时间上是一致的，教师在讲的同时，学生就在听，而且，师生之间可以有一些简单的交互，这与传统教学模式是一样的。
这种教学模式需要采用基于H.323协议的视频会议系统来实现。
这种会议系统，可以在Internet中实时地传输视音频信息，在教学过程中，教师在配有摄像机、话筒、电子白板、投影仪的授课教室中讲课，学生在配有同样设备的远端教室中聆听教师的授课，教师讲课形式与传统课堂讲授形式一样，在电子白板上板书，通过投影系统观察远端教室中的学生表情，通过视频控制系统接收学生的反馈信息等等。
目前，在Internet上的视频会议系统已经有成形产品，但由于互联网络是一种共享宽带的网络，视音频传输质量是不可控的，与网络负载的情况相关，而且，可并发传输的视频信号有限。
要解决这些问题，必须采用基于专用线路的实时交互式视频会议系统，该系统基于电信的专用线路，通信宽
带可以得到稳定的保障，可达到双方或多方实时交互，即要求能够实现实时传送音频和视频。
但这种系统建立在专用通信线路基础之上，专线租用费用是一般单位难以承受的。
同步式讲授的优点在于可以延续传统教学模式，对教师教学要求比较低，而且课堂学习氛围较好，比较适合目前的学习习惯；缺点是缺乏实质性交互，由于课堂授课时间有限，一个教师同时要面对众多的学生，绝大多数学生是无法与教师进行交互的，总体的交互水平较低。
另外同步教学要求学生学习时间与教学同步，而参与远程学习的学习者群体大、地域范围分布广，结构复杂，很难集中在一个时间在一个地点进行学习。
2.异步式讲授异步式讲授指教师和学生不仅在空间上也是分离的，即教师在讲授的时候，远端不一定有学生在听，而学生可能是在教师讲完后，在其合适的时间里去学习，异步式讲授也可以很简单地实现，只要利用Internent的WWW服务及电子邮件服务就可以满足基本要求。
教师将教学要求、教学内容以及教学评测等教学材料，编制成HTML文件，存放在Web服务器上，学生通过浏览这些页面来达到学习的目的。
当学生遇到疑难问题时，便以BBS或电子邮件的方式询问教师，教师再通过BBS或电子邮件对学生的疑难问题给予解答。
在此过程中，学生还可阅读一些教师提供的参考资料，就像我们在学习图书馆中查找资料一样。
学生不仅可以通过BBS或电子邮件向教师请教，也可以通过BBS或电子邮件与其他学习者讨论交流。
这种模式的特点在于教学活动可以全天24小时进行，每个学生都可以根据自己的实际情况确定学习的时间、内容和进度，可随时在网上下载学习内容或向教师青胶，其主要缺点是缺乏实时的交互性，对学生的学习自觉性和主动性要求较高，这种教学模式要取得比较好的教学效果，必须要有一套能充分体现学习者特点，并能适合网上信息表达与传输的图、文、声并茂的优秀电子教材；要为学生提供与该课程机密配合的大量信息资料(最好建立一个虚拟的图书馆)，还要建立一个专门负责解答学生疑难问题，并能对学生做形成性评价的应答与测评反馈系统。
作业说明：请先学习第一、二、六和七章的内容，然后完成以上作业。
进入福建师大网络教育学院网上平台，学习网站平台操作，练习访问浏览、答疑、讨论、电子邮箱申请与注册、交作业、下载园地等实验环节。
计算机应用基础第一次作业答案
你选择的答案：［前面作业中已经做正确］［正确］正确答案：A解答参考：4. _______________________________________ 计算机内部用于处理数据和指令的编码是。
(A) 十进制码(B) 二进制码(C) 十六进制码(D) 汉字编码你选择的答案：［前面作业中已经做正确］［正确］正确答案：B解答参考：5. 冯诺依曼1946年提出了计算机的程序存储原理。
下面关于这一原理的说法错误的是___________(A) 计算机内的程序由指令构成，程序和数据都用二进制数表示(B) 程序由指令构成(C) 计算机以中央处理器为中心(D) 掌上计算机机器尺寸太小，无法存储程序，是由使用者用口语命令它工作的你选择的答案：［前面作业中已经做正确］［正确］正确答案：D解答参考：6. 微型计算机的主机包括_______ 。
(A) 运算器和显示器(B) 中央处理器和内存储器(C) 中央处理器和键盘(D) 中央处理器和鼠标你选择的答案：［前面作业中已经做正确］［正确］正确答案：B解答参考：7. 在Excel 2003中，A7和N9围成的单元格区域的表示为___________ 。
(A) A7#N9(B) A7+N9(C) A7:N98. 在Excel 2003中，选择一块单元格区域后，若要实现合并及居中的功能则最少需要单击格式工具栏中相应的_______ 。
(A) 2个按钮(B) 3个按钮(C) 4个按钮(D) 1个按钮解答参考：9. 要启动记事本，应依次执行的一组操作步骤是。
(A) 开始-所有程序--附件--记事本(B) 我的电脑--控制面板--记事本(C) 资源管理器--记事本(D) 我的电脑--控制面板--辅助选项--记事本解答参考：10. 在Windows中，当选定文件或文件夹后，不将文件或文件夹放到’回收站'中，而直接删除的操作是______ 。
(A) 按 Delete 键(B) 用鼠标直接将文件或文件夹拖放到"回收站"中(C) 按 Shift + Delete 键(D) 用"我的电脑"或"资源管理器"窗口中"文件"菜单中的删除命令你选择的答案：［前面作业中已经做正确］［正确］正确答案：C解答参考：11. 不同于一般的纯文本格式的邮件，下列哪一种电子邮件可以插入好看的图片，可以更改字体或者字的大小、颜色等，做到'图文并茂' _______ ?(A) Word格式的邮件(B) 传统电子邮件(C) Web格式的邮件(D) 文本格式的邮件你选择的答案：A ［正确］16. 以下软件中，不属于视频播放软件的是 _____ 。
《网络教育应用基础》在线自测练习参考答案
《网络教育应用基础》在线自测练习参考答案第一章网络与教育自测练习题第1题:(2分)美国前总统克林顿于1996年曾提出了一个所谓的（）纲领1.信息高速公路发展2.教育技术行动3.京都协议4.网络教育答案：2第2题:(2分)在网络教育过程中，教师和学生之间的互动方式不包括1.纯粹的Web交互2.面对面的提问3.利用asp,jsp4.Web编程技术表单答案：2第3题:(2分)网络教育过程中包含的因素可以分为：（）1.教育者、学习者、计算机网络2.教育者、学习者、教育信息3.教育者、学习者、计算机网络、教育信息4.网络教室、电子点名系统、在线考试系统、课程学习系统答案：3第4题:(2分)利用计算机网络开展教学活动也有缺点，表现在：（）1.教师必须适应网络时代非线性思维的要求2.促进教师与学生之间的交流3.促进学生之间的相互合作学习4.实现资源共享答案：1第5题:(2分)网络教育过程的主体是：（）1.教育者2.学习者3.计算机网络4.教育信息答案：2第6题:(2分)网络教育的一个特征表现在师生处于（）状态可供选择答案:1.通信2.教学3.分离4.讨论答案：3第7题:(2分)在网络上实现所谓的“网上学校”属于网络教育的（）可供选择答案:1.虚拟功能2.共享功能3.检索功能4.服务功能答案：1第8题:(2分)网络教育产生和发展的物质基础是：（）可供选择答案:1.幻灯投影技术2.知识爆炸3.经济高速发展4.计算机和计算机网络技术答案：4第9题:(2分)在美国其中一个非常重要的面向中小学的教育资源就是网上K-12，其中的字母K表示的是（）1.网络2.中小学3.儿童4.信息高速公路答案：3第10题:(2分)1998年，（）提出“因特网宣言”，通过实现5个新目标来进一步完善全球信息基础设施的建设。
1.比尔·盖茨2.阿尔·戈尔3.史蒂夫·鲍尔默4.理查德·贝卢佐答案：2简答题第1题:(5分)中国网络教育的发展方向。
《计算机应用基础》第一次作业题目、答案
福建师范大学网络教育学院《计算机应用基础》第一次作业一、单项题（请在答题卡上填写答案，否则不予计分）1、利用计算机对指纹进行识别、对图像和声音进行处理属于的应用领域是__C____。
A：科学计算 B：过程控制 C：辅助设计 D：数据处理2、计算机配置的内存的容量为128MB或128MB以上，其中的128MB是指__D____。
A：128×1000×1000字节 B：128×1000×1000字C：128×1024×1024字 D：128×1024×1024字节3、下列不属于微机主板上主要组件的是___D___。
A：CMOS B：内存插槽 C：高速缓存(Cache) D：键盘4、目前，打印质量最好的打印机是__D____。
A：针式打印机 B：点阵打印机 C：喷墨打印机 D：激光打印机5、不正常关闭Windows操作系统可能会___D___。
A：系统消失 B：硬件损坏 C：无任何影响 D：丢失数据6、在Windows中，不属于由用户设置的文件属性为__D____。
A：存档 B：只读 C：隐藏 D：系统7、在Windows 中，关闭"资源管理器"窗口，可以__D____。
A：单击"资源管理器"窗口右上角的"×"按钮B：单击"资源管理器"窗口左上角的图标，然后选择"关闭"C：单击"资源管理器"的"文件"菜单，并选择"关闭"D：以上三项都正确8、在"资源管理器"中希望显示出文件或文件夹的名称、大小、类型、最后修改的日期和时间时，应选择的菜单项是__D____。
A：小图标 B：大图标 C：列表 D：详细资料9、在Windows 控制面板中，使用"添加\删除程序"的作用是___D___。
网络教育应用基础作业
网络教育应用基础作业21.（30.0分）如何通过网上教学平台进行交作业？请写出具体新平台的操作步骤2.（30.0分）你是如何完成网络课程的“课程内容”学习？请写出具体的新平台操作步骤3.（40.0分）你认为新的教学平台还要哪些地方需要修改或功能需要优化的？作业11.（35.0分）你是如何进行学院电子邮箱的申请与注册，请写下具体的操作步骤。
2.（35.0分）网络教育与传统的教育相比，有那些显著的特点? 请结合自已的体会针对其中的某一特点进行阐述3.（30.0分）你为什么要报名参加福建师大网络与继续教育学院的学习？计算机应用基础作业2单选题 (共20道题)1.（3.0分）在Excel 图表中，使用x轴作为（）。
• A、函数轴• B、数值轴• C、分类轴• D、公式轴2.（3.0分）在Word的编辑状态，连续进行了两次“插入”操作，当单击一次“撤消”按钮后( )。
• A、将两次插入的内容全部取消• B、将第一次插入的内容取消• C、将第二次插入的内容取消• D、两次插入的内容都不被取消3.（3.0分）在PowerPoint中，改变当前一张幻灯片的布局，应选择"格式"菜单中的命令是______。
• A、幻灯片版式• B、幻灯片配色方案• C、应用设计模式• D、母板4.（3.0分）在Excel的电子工作表中建立的数据表，通常把每一列称为一个________。
• A、记录• B、元组• C、属性• D、关键字5.（3.0分）访问，其地址的正确写法是______。
• A、• B、• C、• D、ftp:\\6.（3.0分）某台主机的域名为，其中______为主机名。
• A、public• B、cs• C、hn• D、cn7.（3.0分）在Excel 中，假定要向一个单元格输入文本数据12345，则输入的内容为________。
• A、&12345• B、=12345• C、'12345• D、123458.（3.0分）以下关于IE中"主页"的说法错误的是______。
西南大学网络教育0405专升本教育学作业及答案
西南大学网络教育0405专升本教育学作业及答案《教育学》作业第一次作业一、名词解释1、潜在课程：指学校潜在课程指学校内部那些难以预期的，伴随着正式课程而随机出现的，对学生产生潜移默化影响的各种教育因素的总和。
2、教育制度：教育制度是指一个国家或地区各级各类的教育机构与组织的体系及其管理规则。
首先，教育制度是指一个国家或地区的各级各类学校的教育机构和组织的体系；其次，教育制度是指教育机构与组织体系赖以存在与运行的一整套规则。
3、探究学习：探究学习是从科学领域或现实社会生活中选择和确定研究主题，在教学中，创设一种类似学术（或科学）研究的情境，通过学生自主、独立地发现问题、试验、操作、调查、搜集与处理信息，表达与交流等探索活动，获得知识、技能、情感与态度的发展，特别是探索精神和创新能力的发展的学习方式和学习过程。
4、课程：“课程”作为一个教育学概念，首先涉及到对学校教育内容的组织。
其次，课程也涉及到对预定的教育标准或目标、预期的教学结果的系统规定。
再次，课程还涉及到对学校教学、教育活动的总体构思和初步设计。
据此，可以将课程定义为：课程是对学校教育内容、标准和进程的总体安排。
其最重要的特征是“计划性”或“方案性”即给教学、教育活动提供方案。
作为方案，课程是学校各类教学、教育活动的基本依据或“蓝图”，各类教学、教育活动则是课程的实施或具体执行。
5、主体性原则：所谓主体性原则，一般来说就是承认、重视并坚持主体在实践和认识活动中的地位和作用的原则。
二、简答题1、简述教学过程的规律答：（1）教学认识过程简约性的规律，在教学过程中，教师引导学生掌握知识的过程就是要把人类的认识成果转化为学生个体认识的过程。
（2）教学与发展相统一的规律，教学与发展是教学过程中的一对基本矛盾，正是这对矛盾的存在、运动，推动了教学的发展，成为教学过程运行的原动力。
我们这里所说的发展包括学生身心两方面的发展。
（3）教和学相统一的规律，教学活动是教师的教和学生的学两种活动的有机结合，教和学是同一过程中的两个方面。
计算机网络第一次作业
计算机网络第一次作业计算机网络是现代信息技术的重要基础，它涉及到了计算机通信和数据传输的原理、技术和方法。
随着互联网的飞速发展和普及，计算机网络已经成为了现代社会不可或缺的一部分。
本篇文章将对计算机网络的基本概念、结构和发展进行详细介绍。
首先，计算机网络可以简单理解为将若干台计算机通过通信链路进行连接，以实现信息和资源共享的一种技术。
它的基本组成部分包括：终端设备、通信线路、网络设备和协议等。
终端设备是指计算机、手机、平板等终端用户使用的设备；通信线路是指物理链路或无线信道，用于传输数据和信号；网络设备是指路由器、交换机等网络设备，用于构建和管理网络；协议是指在网络中通信时所遵循的公共规则和约定。
计算机网络的结构主要包括两种：互连网和局域网。
互连网是指将多个局域网通过路由器连接起来的网络，它可以实现全球范围内的计算机互联。
局域网是指局限在一些范围内的网络，例如家庭、学校、公司内部的网络等。
互连网和局域网的主要区别在于规模和范围，互连网是由多个局域网组成的。
在计算机网络中，数据通信的过程可以简单概括为信息的发送和接收。
发送方通过将信息转换为数据包，然后通过网络设备和通信线路将数据包发送给接收方。
接收方接收到数据包后，再将其转换回信息。
在这个过程中，需要使用到一系列的协议来实现数据的可靠传输和处理。
如今的计算机网络已经成为人们生活和工作中不可或缺的一部分。
人们可以通过互联网实现远程办公、在线教育、网络购物等许多方便的服务。
此外，计算机网络还对现代社会的产业、交通、医疗、教育等各个领域都产生了深远的影响。
人们现在已经很难想象一个没有计算机网络的世界。
综上所述，计算机网络是现代社会不可或缺的一部分。
它将个人、组织和国家连接在了一起，实现了信息和资源的无缝共享。
随着科技的不断进步，计算机网络的规模和功能将会不断扩大和完善，为人们提供更加便捷的服务和更广阔的发展空间。
2018春上海交通大学视觉传达网络教育_计算机作业1_93分
计算机应用基础（一）a.b.c.d.反馈正确答案是：极大的通用性题目2正确获得1分中的1分标记题目题干微型计算机的微处理器芯片上集成了____。
选择一项：a. CPU和ROMb. 控制器和运算器c. 控制器和RAMd. 运算器和I\O接口反馈正确答案是：控制器和运算器题目3正确获得1分中的1分标记题目题干人们经常利用计算机多媒体技术，对讲解的内容进行形象、直观的描述，以达到更好的表达效果。
这属于计算机应用中的______。
选择一项：a. 辅助设计b. 飞机导航c. 建筑物安全检测d. 文字处理反馈正确答案是：辅助设计题目4不正确获得1分中的0分标记题目题干计算机最重要的特点是______。
选择一项：a. 有记忆能力b. 可靠性与可用性c. 存储程序与自动控制d. 高速度与高精度反馈正确答案是：存储程序与自动控制题目5正确获得1分中的1分标记题目题干各种计算机中，字符的ASCII码不完全相同。
但是对英文26个字母而言，其大写字母与小写字母的序号的相对位置是不变的。
下面的说法正确的是______。
选择一项：a. 大写字母A的序号紧跟在小写字母a的序号后面b. 小写字母a的序号比写大字母A的序号小32c. 大写字母A的序号比小写字母a的序号小32d. 小写字母a的序号紧跟在大写字母A的序号后面反馈正确答案是：大写字母A的序号比小写字母a的序号小32 题目6正确获得1分中的1分标记题目题干SRAM存储器，汉语译为______。
选择一项：a. 静态随机存储器b. 动态只读存储器c. 动态随机存储器d. 静态只读存储器反馈正确答案是：静态随机存储器题目7正确获得1分中的1分标记题目题干在图形用户界面的操作系统中，最常使用的设备是______。
选择一项：a. 鼠标b. 麦克风c. 打印机d. 扫描仪反馈正确答案是：鼠标题目8正确获得1分中的1分标记题目题干按照传送的信息对总线分类，不包括______。
选择一项：a. 地址总线b. 数据总线c. 系统总线d. 控制总线反馈正确答案是：系统总线题目9正确获得1分中的1分标记题目题干"ASCII码"，用来将字符转换为二进制数。
网络教育应用基础作业一
一、网络教育对学习时间没有限制。由于现代人的生活节奏比较快，尤其是在职人员工作繁忙，很难挤出大块时间继续深造。而互联网的开放性决定了网络上的信息资源可随时共享，因此摆脱了传统教育对学习时间的严格要求，求学者可根据需要自主安排学习时间。
二、网络教育对学习地点没有限制。网络教育为求学者提供了平等享用教育资源的机会，它使学校教育突破了地域的界限，大大提高了教育资源的利用率。传统教育需要到校上课。
（8）负责学生日常管理工作。
3、保持与中心的老师和同学联系：通过建立QQ群，微信群，提问，讨论，或者参与问题的讨论，以及发送邮件到个人的电子邮箱，建立通讯录，录入大家的联系方式，手机号码，等。
4、自己对校外学习中心认识的体会与思考：
校外学习中心主要负责为高校招生和学生报名，组织入学考试，期末考试，另外班主任老师会通知学生及时完成作业，在考试月会组织进行考试等
五、网络教育本身就是为了让考生提高自己的知识和学历水平，因此对考生的年龄、身份、地位等，都不限制，都可以享受无差别的教育。传统教育是年龄差不多的学生一起上课。甚至按身份、地位，分学校，分班级上课。
六、尤其是在职人员，非常适用于网络教育。学习者不需要长途跋涉跑到指定的地方学习，不需要请假上课，省去很多费用，是在职人士提升学历的先选择，传统教育需要不上班，全日制学习。
1、我所在的校外学习中心：
弘成上海数字化学习中心
2、校外学习中心职责：
（1）贯彻执行国家、地方有关现代远程教育的方针政策，认真执行试点高校现代远程教育的各项规章制度
（2）根据试点高校的要求和工作安排，配合试点高校开展招生宣传和组织生源等活动；做好学生报到注册工作；校外学习中心不能跨省开展招生宣传和组织工作。
交大网络教育_光纤第一次作业答题
第一次作业（第二章）1、光波从空气中以θ1=60°的角度入射到一平板玻璃上，此时一部分光束被反射，另一部分被折射。
如果反射光束与折射光束之间的夹角正好为90°，该玻璃板的折射率等于多少？又当光波从玻璃板入射到空气中时，该玻璃板的全反射临界角是多少？答：入射角θ1=60°根据上图以及入射角θ1、反射角θ1’、 折射角θ2的关系式：θ1＝θ1’n1sin θ1＝n2sin θ 2得：折射角θ2=90°－60°＝30°n2=n1sin θ1/sin θ2＝sin60°/sin30°=0.866/0.5=1.732全反射临界角θc=arcsin(n1/n2)=arcsin(1/1.732)=35.3°2、一阶跃光纤，其纤芯折射率n 1=1.52，包层折射率n 2=1.49。
求：（1）光纤放置在空气中，光从空气中入射到光纤输入端面的最大接收角是多少？ （2）光纤浸在水中（n 0=1.33），光从水中入射到光纤输入端面的最大接收角是多少？答：由公式n0sin φ0=n1sin φ1=n1cos θc,在光纤内n1,n2交界面上的全反射公式为n1sin θc=n2,可得(1)22221sin 110sin n n n c -=-=θφ=2249.152.1-=0.3φ0=arcsin(0.3)≈17.5°(2)22221sin 110sin 0n n n n c -=-=θφ=0.3φ0=arcsin(0.3/n0)=arcsin(0.3/1.33)≈13°3、某阶跃光纤的纤芯折射率为1.5，相对折射率差为Δ=0.003，纤芯的直径为7μm ，问：（1）该光纤的LP 11高阶模的截止波长λct 是多少？（2）当纤芯内光波长λ1=0.57μm 和0.87μm 时，能否实现单模传输？答：∆=-=22212122n an n aV λπλπ m 1.064048.2003.025.15.32221μμππλ≈⨯⨯⨯⨯⨯=∆=∴m V an 因而（1）该光纤的LP 11高阶模的截止波长λct 为1.06um 。
网络教育(自学考试)大学英语(1)作业题及答案三套
网络教育（自学考试）大学英语（1）作业题及答案三套2013年9月份考试大学英语(1)第一次作业一、单项选择题(本大题共40分，共 40 小题，每小题 1 分)1. Many years ago, the girl ( ) in London with her family for a longtime.A. livedB. had livedC. has livedD. was living2. The man knocked at the door ( ) nobody answered.A. andB. soC. orD. but3. The man knocked at the door ( ) nobody answered.A. andB. soC. orD. but4. ––The air is full of smoke and people are coughing. ––It'll get worse ( ) the government does something about pollution.A. butB. exceptC. besidesD. unless5. The sports shoes only ( ) 20 dollars A. costsB. spendsC. takesD. keeps6. There isn’t any difference between the two. I really don’t know ( ).A. which to chooseB. to choose whatC. what to chooseD. to choose which7. When you come out of the elevator, turn ( ) left.A. aB. anC. theD. ×8. The manager’s office is ( ) the fourth floor downstairs. A. atB. inC. onD. from9. There were so many people that police found it very hard to bring the situation ( ) control. A. atB. underC. withD. on10. Great changes ( ) in China since 1978.A. have been taken placeB. have taken placeC. has been taken placeD. has taken place11. It is a nice day to me. Why not ( ) for a picnic?A. go forB. go toC. go outD. go in12. ( ) some mammals came to live in the sea is not knownA. WhichB. SinceC. AlthoughD. How13. The pants are too ( )( ) for me. I’d like some loose ones. A. shortB. closeC. tightD. narrow14. Would you plea se tell me( )? A. where is the manager’s office?B. where the manager’s office is?C. the manager’s office is where?D. how can I find the manager’s office.15. The number of the visitors, ( ) we had expected, was well overtwo hundred.A. thatB. whereC. whoD. as16. . It’s raining as far east ( ) Detroit and Toronto. A. asB. toC. forD. so17. The movie was very boring and only ( ) people finished it.A. fewB. littleC. a fewD. a little18. . It’s raining as far east ( ) Detroit an d Toronto.A. asB. toC. forD. so19. We have to do this uninteresting work ( ) we like it or not. A. no matterB. eitherC. whateverD. whether20. ( ), how can I get to the Kodak company?A. I'm sorryB. Please tell meC. WellD. Excuse me21. It looks ( )that rain is going to continue through the weekend.A. likeB. asC. ifD. whether22. ( ) I had time, I would have gone over to see her. A. DidB. WereC. HadD. If23. When talking about fruits, I prefer banana ( ) apple.A. overB. ofC. atD. to24. It ( ) for the woman to realize that she had spelled my name incorrectly.A. took five minutesB. was five minutesC. had five minutesD. take five minutes25. Between 1886 and 1914, Canada received over two million immigrants. The majority of them were from Eastern Europe. The government welcomed these people by offering them free farmland in the West. However, Canada immigration policy was not equal for Asian immigrants. The Canadian government passed two laws to prevent Chinese immigration. In 1885, the Canadian government passed the first law to prevent Chinese immigration. The law forced every Chinese person entering Canada to pay a $50 entry fee. The government introduced this head tax to satisfy Caucasian(高加索人) laborers whofelt that Chinese immigrants were competing for their jobs. The head tax was a burden for Chinese immigrants, but it did not prevent them from coming to Canada. For many of these poor Chinese laborers, they could earn more money there than in China. They were willing to borrow the money to pay for the overseas trip and the head tax. The Canadian government raised the head tax to $100 in 1900, then to $500 in 1903. The Canadian government passed its most restrictive immigration law in 1923. That year, the Chinese Immigration Act prevented all Chinese except officers, merchants, and students fromAsian entering Canada. The Act was the result of pressure from anti-groups. These groups felt that the head tax was insufficient because Chinese laborers were still coming to Canada. The law effectivelystopped Chinese immigration from 1923 to 1947. During the 24-year period, only 44 Chinese entered Canada officially.A. because Chinese immigrants conquered their landsB. Chinese immigrants were competing for their jobsC. because to many Chinese immigrants came to CanadaD. All of the above26. Music ( ) us a lot of pleasure.A. givingB. giveC. givesD. gived27. There are many misunderstandings about American Indian names. Crazy Horses, for example, was given to a man because he was courageous, not because he was mad. Indian families had no last names. The Sioux Indians give individuals three or four names. The first name was givenat birth. It showed the order of a birth into the family. Wenonah, for instance, meant “firstborn daughter”. The second name, the honor name, was given to the child by a medicine man (有法术之人). It usuallyreferred to the fine character of good deeds of one of the child’s ancestors (祖先). When he grew up, the personwas expected to live up to this name. Otherwise, the person mightnot be called by it. The third name was the nickname. It usuallyreferred to something odd (临时的) that the person had done. It was hardlyever flattering. The fourth name came the deed name. It was give nby a war chief after the person accomplished some good or extraordinary bravery. The name might be that of a fear –– inspiring animal such as Bear or Buffalo or that of a noble bird, such as Eagle, Hawk or Owl.A. He had done something oddB. American Indians liked to give nicknamesC. He was courageousD. He liked the animal best28. There are many misunderstandings about American Indian names. Crazy Horses, for example, was given to a man because he was courageous, not because he was mad. Indian families had no last names. The Sioux Indians give individuals three or four names. The first name was givenat birth. It showed the order of a birth into the family. Wenonah, for instance, meant “firstborn daughter”. The second name, the honor name, was given to the child by a medicine man 有法术之人). It usuallyreferred to the fine character of good deeds (of one of the child’s ancestors (祖先). When he grew up, the person was expected to live up to this name. Otherwise, the person mightnot be called by it. The third name was the nickname. It usuallyreferred to something odd (临时的) that the person had done. It was hardlyever flattering. The fourth name came the deed name. It was give n by a war chief after the person accomplished some good or extraordinary bravery. The name might be that of a fear –– inspiring animal such as Bear or Buffalo or that of a noble bird, such as Eagle, Hawk or Owl.A. Parent.B. Medicine man.C. War chief.D. School teacher.29. Between 1886 and 1914, Canada received over two million immigrants. The majority of them were from Eastern Europe. The government welcomed these people by offering them free farmland in the West. However, Canada immigration policy was not equal for Asian immigrants. The Canadian government passed two laws to prevent Chinese immigration. In 1885, the Canadian government passed the first law to prevent Chinese immigration. The law forced every Chinese person entering Canada to pay a $50 entry fee. The government introduced this head tax to satisfy Caucasian(高加索人) laborers whofelt that Chinese immigrants were competing for their jobs. The head tax was a burden for Chinese immigrants, but it did not prevent them from coming to Canada. For many of these poor Chinese laborers, they could earn more money there than in China. They were willing to borrow the money to pay for the overseas trip and the head tax. The Canadian government raised the head tax to $100 in 1900, then to $500 in 1903.The Canadian government passed its most restrictive immigration law in 1923. That year, the Chinese Immigration Act prevented all Chineseexcept officers, merchants, and students fromentering Canada. The Act was the result of pressure from anti-Asian groups. These groups felt that the head tax was insufficient because Chinese laborers were still coming to Canada. The law effectively stopped Chinese immigration from 1923 to 1947. During the 24-year period, only 44 Chinese entered Canada officially.A. because Chinese immigrants conquered their landsB. Chinese immigrants were competing for their jobsC. because to many Chinese immigrants came to CanadaD. All of the above30. There are many misunderstandings about American Indian names. Crazy Horses, for example, was given to a man because he was courageous, not because he was mad. Indian families had no last names. The Sioux Indians give individuals three or four names. The first name was givenat birth. It showed the order of a birth into the family. Wenonah, for instance, meant “firstborn daughter”. The second name, the honor name, was given to the child by a medicine man (有法术之人). It usuallyreferred to the fine character of good deeds of one of the child’s ancestors (祖先). When he grew up, the personwas expected to live up to this name. Otherwise, the person mightnot be called by it. The third name was the nickname. It usuallyreferred to something odd (临时的) that the person had done. It was hardlyever flattering. The fourth name came the deed name. It was give nby a war chief after the person accomplished some good or extraordinary bravery. The name might be that of a fear –– inspiring animal such as Bear or Buffalo or that of a noble bird, such as Eagle, Hawk or Owl.A. Parent.B. Medicine man.C. War chief.D. School teacher.31. Sally ( ) a cup of coffee whenever she comes home.A. feels likeB. feelC. likeD. feels alike32. I don't think that I shall fail. But if I ( ), I would try again.A. should failB. would failC. failedD. had failed33. There are many misunderstandings about American Indian names. Crazy Horses, for example, was given to a man because he was courageous,not because he was mad. Indian families had no last names. The Sioux Indians give individuals three or four names. The firstname was given at birth. It showed the order of a birth into the family. Wenonah, for instance, meant “firstborn daughter”. The second name, the honor name, was given to the child by a medicine man (有法术之人). It usually referred to the fine character of good deeds of one of the child’s ancestors (祖先). When he grew up, the person was expected to live up to this name. Otherwise, the person might not be called by it. The third name was the nickname. It usually referred to something odd (临时的) that the person had done. It was hardly ever flattering. The fourth name came the deed name. It was give n by a war chief after the person accomplished some good or extraordinaryinspiring animal such bravery. The name might be that of a fear ––as Bear or Buffalo or that of a noble bird, such as Eagle, Hawk or Owl.A. misunderstandings about American Indian names,B. the way American Indians are named,C. American Indian family namesD. the number of American Indian names34. Linda ( ) a dancer, but now she is a bit overweight. A. is used to beB. is used to beingC. used to beD. used to being35. —Someone took my book. —Well, I didn't and ( ).A. nor did JackB. nor Jack didC. Jack did norD. Jack nor did36. He will be punished ( ) he does his work.A. unlessB. ifC. forD. because37. He ( ) when his teacher asked him to hand it in. A. has just finished his paperB. just finished his paperC. would just finish his paperD. had just finished his paper38. John ( ) to Beijing many times and he knows the city very well.A. wentB. has goneC. goesD. has been39. Simply saying “hi” is an ( )greeting.A. informalB. formalC. informD. form40. I ( ) the dorm with 8 classmates.A. shareB. liveC. accompanyD. include二、阅读理解单项选择题(本大题共60分，共 6 小题，每小题 10 分)1. Advertising can be tho ught of “as the means of making known in order to buy or sell goods or services”. Advertising aims to increase people’s awareness and arouse interest. It tries to inform and to persuade. The media are all used to spread the message, and the press offers a fairly cheap method. Magazines are used to reach special sections of the market. The cinema and commercial radio are useful for local markets. Television, although more expensive, can be very effective. Posters are fairly cheap and more permanent in their power of attraction. Other ways of increasing consumer interest are through exhibitions and trade fairs as well as direct mail advertising.We might ask whether the cost of advertising is paid for by the manufacturer or by the consumer. Since advertising forms part of the cost of production, which has to be covered by the selling price, it is clear that it is the customer who pays for advertising. However, if large scale advertising leads to increased demand, production costs are reduced, and the customer pays less.It is difficult to measure exactly the influence of advertising on sales. When the market is growing, advertising helps to increase demand. When the market is shrinking, advertising may prevent a bigger fall in scales than would occur without its support. What is clear is that businesses would not pay large sums for advertising if they were not convinced of its value to them.(1). Advertising is often used to ( )A. convince customersB.promote productionC.rise interestD.push the sales(2). According to the passage, trade fairs (Paragraph 1) may ( ) .A. replace exhibitions and markets supplyB.local goods and servicesC.attract possible customersD.provide cheap amusements(3). Advertising is in the main paid for by ( ) .A. the customerB.the producerC.the increased salesD.the decreased costs(4). The author says that advertising can increase demand ( )A. in any period of salesB.in any circumstancesC.in a growing marketD.in a shrinking market(5). What the last sentence of this passage actually tells us isthat ( ).A. businessmen usually do not pay more for advertising than they have toB.businessmen know well that advertising could bring them more profits C.advertising couldn’t convince people of the value of the goods advertising usually costsD.businessmen large amounts of money2. Few Americans remain in one position or one place for a lifetime. We move from town to city to suburb, from high school to college in a different state, from a job in one region to a better job elsewhere,from the home where we raise our children to the home where we plan to live in retirement. With each move we are forever making new friends, who become part of our new life at that time. For many of us summer is a special time for forming new friendships. Today millions of Americans vacation abroad, and they go not only to see new sights but also withthe hope of meeting new people. No one really expects a vacation trip to produce a close friend, but the beginning of a friendship is possible The word “ friend ” can be applied to a wide range ofrelationships — to someone one has known for a few weeks in a new place, to a fellow worker, to a childhood playmate, to a man or woman, to a trusted confidant ( 知已 ).(1). Many Americans move from place to place for the following reasons except( )A. going to college?B.getting a better jobC.finding a place to live in retirement D.saving money(2). Summer is a special time when many Americans( )A. enjoy the sunlightB.feel strangeC.travel to other countriesD.get a new job(3). When summer comes, many Americans( )A. hope to meet new peopleB.expect to find some close friendsC.want to begin lasting friendships with new people D.Both A and B(4). From the passage it can be seen that a “friend” can be ( )A. a fellow workerB.a football teammateC.a boy or a girlD.all of the above(5). Which of the following is the topic sentence of the second paragraph? ( )A. For many of us summer is a special time for forming newfriendships.B.Today millions of Americans vacation abroad C.No one really expects a vacation trip to produce a close friendD.But surely the beginning of friendship is possible3. Almost every family buys at least one copy of a newspaper everyday. Some people subscribe to as many as two or three differentnewspapers. But why do people read newspapers? Five hundred years ago, news of important happenings — battles lost and won, kings or rulers overthrown or killed — took months and evenyears to travel from one country to another. The news passed by word of mouth and was never accurate. Today we can read in our newspapers of important events that occur in faraway countries on the same day they happen.Apart from supplying news from all over the world, newspapers giveus a lot of other useful information. There are weather reports, radio, television and film guides, book reviews, stories, and, of course, advertisements. There are all sorts of advertisements. The bigger ones are put in by large companies to bring attention to their products. They pay the newspapers thousands of dollars for their advertising space, but it is worth the money, for news of their products goes into almost every home in the country. For those who produce newspapers, advertisementsare also important. Money earned from advertisements makes it possible for them to sell theirThe habit of newspapers at a low price and still make a profit.(1).reading newspapers is ( )A. widespreadB.found among a few familiesC.not popularD.uncommon(2). In the past, news was ( )A. sent by telegraphB.sent by letterC.assed from one person to anotherD.sent by telephone(3). The money spent on advertisements is ( )A. wastedB.not muchC.worthwhileD.of no use to anyone(4). Which of the following statements is not true? ( )A. Five hundred years ago news did not take a long time to reach other countries.B.Large companies put big advertisements in the newspapers to make their products known.C.The news that we need in our newspapers is up-to-date. D.Though the newspapers are sold at a low price, their owners still gain profit.(5). The phrase “subscribe to” in the second sentence means ( ).A. contribute toB.write toC.pay for receivingD.appreciate) 4. During the summer holidays there will be a revised ( 修改过的schedule of services for the students. Changes for dining-room and library service hours and for bus schedules will be posted on the walloutside of the dining-hall. Weekly film and concert schedules, which are being arranged, will be posted each Wednesday outside of the student club.In the summer holidays, buses going to the town center will leavethe main hall every hour on the half hour during the day. The dining-room will serve three meals a day from 7:00 am to 7:00 pm during the week and two meals from noon to 7:00 pm on weekends. The library will continue its usual hours during the week, but have shorter hours on Saturdays and Sundays. The weekend hours are from noon to 5:00 pm. All students who want to use the library borrowing services must have a new summer card. This announcement will also appear in the next week''s student newspaper.(1). The main purpose of this announcement is to ( )A. tell students of important schedule changesB.tell students of new bus and library servicesC.show the excellent services for studentsD.ask students to renew their library cards(2). At which of the following times will the bus leave the main hall? ( )A. 8:00, 9:00, 10:00, 11:00B.8:30,9:30, 10:30, 11:30C.8:30,9:00, 9:30, 10:00D.8:00, 9:30, 11:00, 12:30(3). Times for films and concerts are not listed in this announcement because ( )A. they are not to be announcedB.they are posted outside of the student clubC.the full list is not readyD. ?the full list is too long(4). In the summer holidays, the library will have ( )A. no special hoursB.special hours on weekdaysC.special hours on weekendsD.special hours both on weekdays and weekends(5). We may infer that during the summer holidays ( )A. the student newspaper will sell more copiesB.there will be a concert or a film once a weekC.many students will stay in the universityD.no breakfast will be served on weekend5. Tokyo: Three snakes, whose poison could kill a person in ten minutes, are guarding a blue star sapphire ( 蓝宝石 ) worth nearly six hundred thousand dollars at a Japanese exhibition of jewels sent from an Indian museum."Normally it would be forbidden to let these poisonous snakes guard exhibition objects, but it''s different this time because the jewels are being exhibited at a hotel," a police official said. Exhibitionofficials said that a person bitten( 咬 )by one of these snakes would need at least 80 ml of an anti-poison medicine to be saved. Medicine was being kept ready at a nearby hospital. Star sapphires and other valuable jewels worth a total of one million dollars are on show behind glass. Hundreds of visitors came to see the special blue star sapphire and were surprised when they saw the sixty-centimeter long brown guards.(1). Using snakes at exhibitions ofvaluable objects is ( )A. quite normalB.never allowedC.often necessaryD.usually forbidden(2). The jewels were being shown in ( )A. an Indian hotelB.an Indian museumC.a Japanese hotelD.a Japanese museum(3). Why were the snakes and jewels at the same exhibition? ( )A. They were both special things from IndiaB.The snakes were there to keep the jewels safe.C.The organizers wanted to do something unusual.D.People liked to visit an exhibition guarded by snakes.(4). Many visitors came to the exhibition because ( ).A. the snakes were on showB.so many jewels were being exhibitedC.exhibition officials said it was specialD.they were interested in seeing a famous jewel(5). What’s the feeling of the visitors when they saw the guards of the blue star? ( )A. surprisedB.remoteC.sadD.excitedE.6. The MarylandScienceCenter is more than fun. You can enjoy thethree floors of exciting things, watch the larger-than-life play on the4th floor, and travel to other words, to faraway stars, on the 5th floor.Don’t just look. You are expected to feel, t o turn, to push. Build your own house and learn why it stands or falls. Use computers to workout plans just as famous scientists have done. There is always something new to learn at the MarylandScienceCenter.Children and group visitors enjoy half price.The excitement of the MarylandScienceCenter does not end when you leave. Visit the Science Store for a gift you’d like to keep.Electronic jewelry, games, books, and more – take part of the ScienceCenter home with you.InformationWhere to call:24 hour general information (410) 686-522524 hour STARLINE night sky information (410) 539-STARGroup visitor information (410) 68502370Hours:The MarylandScienceCenter is open 7 days a week (exceptThanksgiving Day and Christmas Day)Friday 10 am – 6 pm Monday –Saturday and Sunday 10 am – 8 pm(1). What can visitors do at the MarylandScienceCenter? ( )A. Learn science by trying it out.B.Watch and take part in a play.C.Make gifts for their friends.(2). The Maryland Science Center stays open ( ) A. every day from 10 am to 8 pmalmost all the weekdays and weekends B.on Thanksgiving Day andC.Christmas Day(3). By calling (410) 685-2370 we can get information about ( ).A. the night sky showB.books and gamesC.group price tickets(4). “ Take part of the Science Center home with you” means that ( )A. visitors can buy something there and take them homeB.the ScienceCenter may be sold to visitors. C.the visitors can make the ScienceCenter their home(5). Which is true about the MarylandScienceCenter? ( )A. Visitors can play and learn at the same time.B.It helps visitors travel to other countries. C.It can be visited 24 hours a day答案:一、单项选择题(40分，共 40 题，每小题 1 分)1. A2. D3. D4. D5. A6. A7. D8. C9. B 10. B 11. C 12. D 13. C14. B 15. D 16. A 17. A 18. A 19. D 20. D 21. A 22. C 23. D 24. A 25.B 26.C 27. C 28.D 29. B 30. D 31. A 32. A 33. B 34. C 35. A 36. A37. D 38. D 39. A 40. A6 题，每小题 10 分) 二、阅读理解单项选择题(60分，共1.(1). D (2). C (3). A (4). C (5). B2.(1). D (2). C (3). A (4). D (5). A3.(1). A (2). C (3). C (4). A (5). C4.(1). A (2). B (3). B (4). C (5). D5.(1). D (2). C (3). B (4). D (5). A6.(1). A (2). B (3). C (4). A (5). A2013年9月份考试大学英语(1)第二次作业一、单项选择题(本大题共40分，共 40 小题，每小题 1 分)1. My American friend knows my problem because I ( ) my ideas with him.A. have changedB. changedC. have exchangedD. exchanged2. We are having a ( ) technical problem with one of our engines. A. lightB. slightC. brightD. slim3. There are many misunderstandings about American Indian names. Crazy Horses, for example, was given to a man because he was courageous, not because he was mad. Indian families had no last names. The Sioux Indians give individuals three or four names. The first name was given at birth. It showed the order of a birth into the family. Wenonah, for instance, meant “firstborn daughter”. The second name, the honor name, was given to the child by a medicine man (有法术之人). It usually referred to the fine character of good deeds o f one of the child’s ancestors (祖先). When he grew up, the personwas expected to live up to this name. Otherwise, the person mightnot be called by it. The third name was the nickname. It usuallyreferred to something odd (临时的) that the person had done. It was hardlyever flattering. The fourth name came the deed name. It was give nby a war chief after the person accomplished some good or extraordinary bravery. The name might be that of a fear –– inspiring animal such as Bear or Buffalo or that of a noble bird, such as Eagle, Hawk or Owl.A. if he could put the meaning of this name into practice,B. if his appearance would be like his ancestor’s,C. only when he grew upD. when he satisfied the medicine man4. Between 1886 and 1914, Canada received over two million immigrants. The majority of them were from Eastern Europe. Thegovernment welcomed these people by offering them free farmland in the West. However, Canada immigration policy was not equal for Asian immigrants. The Canadian government passed two laws to prevent Chinese immigration. In 1885, the Canadian government passed the first law to prevent Chinese immigration. The law forced every Chinese person entering Canada to pay a $50 entry fee. The government introduced this head tax to satisfy Caucasian(高加索人) laborers who felt that Chinese immigrants were competing for their jobs. The head tax was a burden for Chinese immigrants, but it did not prevent them from coming to Canada. For many of these poor Chinese laborers, they could earn more money there than in China. They were willing to borrow the money to pay for the overseas trip and the head tax. The Canadian government raised the head tax to $100 in 1900, then to $500 in 1903. The Canadian government passed its most restrictive immigration law in 1923. That year, the Chinese Immigration Act prevented all Chinese except officers, merchants, and students from entering Canada. TheAsian groups. These groups Act was the result of pressure from anti- felt that the head tax was insufficient because Chinese laborers were still coming to Canada. The law effectively stopped Chinese immigration from 1923 to 1947. During the 24-year period, only 44 Chinese entered Canada officially.A. strictB. seriousC. limitation。