新目标2010—2011学年度第二学期期末学业水平检测八年级英语试卷

2010—2011学年度第二学期期末学业水平检测

八年级英语试卷

友情提示：

1本试题分为第一卷和第二卷两个部分。第一卷65分；第

二卷35分。满分100分。考试时间90分钟。

2 答题前务必将自己的心学校，姓名，准考证号等信息写在

第二卷的指定位置；第一卷做出答案后，一律将答案填写在

第二卷上的第一卷答题栏内，交卷时只交第二卷。

第一卷（选择题共65分）

一听力选择题（共20小题，计20分）

（一）、听句子，选择适当的答语。（5分）

( )1. A. I hope you can. B. I’m afraid I can’t. C. I’m sorry I’m late.

( )2. A. It’s good for your eyes. B. That’s all right. C. What a good idea!

( )3. A. Yes, please. B. Here you are.

C. Don’t give me anything to eat.

( )4. A. Hello! That’s Mike. B. Yes, I am. C. Speaking.

( )5. A. Sometimes. B. for two hours C. three weeks ago.

（二）、听句子，选择与所听句子意思一致的选项。（5分）

( )6. A. They were busy that day. B. They were very well that day.

C. They were pleased that day.

( )7. A. I go to school on foot. B. The school is far from my home.

C. It takes me ten minutes to walk to school.

( )8. A. The doctor usually comes from work late.

B. The doctor worked hard yesterday. So he came back late.

C. It was late and the doctor had to walk home.

( )9. A. Everyone of you can have one apple. B. All of you can have one apple.

C. Nobody can have one apple.

( )10. A. Class is over. B. It’s time for school.

C. It’s time for class.

(三)、听对话和对话后提出的问题，选择正确答案。（5分）

( )11. A. It’s July 4th. B. It’s July 7th. C. It’s July 8th.

( )12. A. It’s twenty five to seven B. it’s five to seven. C. It’s five past seven.

( )13. A. At the cinema. B. At the shop. C. At home.

( )14. A. She had nothing. B. she had chicken, fish, vegetables and rice.C. We don’t know.

( )15. A. Jim’s B. Jim’s brother’s C. Jack’s

(四)、听短文，根据短文内容选择正确答案。（5分）

( )16. The father and the son went shopping ________.

A. on foot

B. by car

C. by bike

( )17. When they finished their shopping _________.

A. they got a problem

B. they met a policeman

C. they were very tired

( )18. _______ opened the door of the car at last.

A. The father

B. The son

C. The policeman

( )19. The owner of the car was angry ________.

A. to find his car

B. to see the policeman

C. to see somebody open the door of his car

( )20. They didn’t know it was the wrong car until they looked at _____ of the car.

A. the door

B. the number

C. the colour

二单项选择（每小题1分，满分15分）

( )21.He_____ if you____ him tomorrow.

A. will come; will invite

B. will come ;invite

C. comes; will invite

D. comes ; invite

( )22.____50 years what____the world be like?

A. On; is

B. In ; will

C. Before; is

D. After; will

( )23.His hair style is the same____.

A.as me

B. with mine

C.as mine

D. and I

( )24.She ____homework when I arrived.

A. does

B. is doing

C. did

D. was doing

( )25.She is ___at all the subjects, and she is ____student in her class.

A. good; best

B. Well; best

C. good; the best

D. well; the best

( )26.If they don’t wear school uniform, the teachers will not ____ .

A. let in them

B. let them in

C. let they enter

D. let them to enter

( )27. Uncle Li ___________ off the train until it goes into the last station.

A. gets

B. doe sn’t gets

C. didn’t get

D. never gets ( )28. ----She’s never late for school, _________? ----_________. It is the third time that he was late.

A. has she; No, he hasn’t

B. is she; Yes, she is

C. hasn’t she; Yes, she has

D. isn’t she; No, she isn’t

( )29. When we saw the flowers in the World Park, we couldn’t stop ____________.

A. to take photos

B. taking photos

C. to taking photos

D. take photos ( )30. ----___________ has your father worked in the company? ----Since 1997.

A. How far

B. How long

C. How soon

D. How often ( )31 Ten years ago___ only one building in our school. And in 10 years，

_______ five buildings in our school.

A. there will be, there are

B. there was, there are

C. there was, there will be

D. there will be; there was

( )32. They go to work early on workdays _ _ Saturday and Sunday.

A. except

B. besides

C. and

D. or

( )33 My friends always get better grades than I do. What should I do? _____

A. Maybe you should not talk to them anymore.

B. Maybe you should ask your parents for help.

C. Maybe you should argue with them.

D. Maybe you should work harder.

( )34.Lily called me ___ Friday morning and told me she was having a birthday party _____ me tomorrow.

A. at; for

B. on; with

C. in; with

D. on; for

( )35.If you meet troubles or difficulties in your life, you must try to _________the troubles.

A. turn over

B. get over

C. take over

D. look over

三、完形填空（10分）

A generation gap ( 代沟) has become a serious problem. I read a 36 about it in

a newspaper. Some children have killed themselves（自杀）after quarrels (争吵)with

37 .

I think this is because they don’t often have a talk with each other. Parents now

2018-2019年八年级上册英语期末试卷及答案

2018---2010学年度第一学期期末考试八年级英语试题（考试时间 120分钟满分 150 分）注意事项： 1. 本试卷分第Ⅰ卷（选择题）和第 II 卷（非选择题）两个部分。 2. 所有选择题的答案均写在答题卡上，答案写在试卷上无效。考生只需交答题卡和第Ⅱ卷。第Ⅰ卷选择题（共 85 分）一、听力（共 25小题; 每小题 l 分，计 25分）第一部分听对话，回答问题。本部分共有 10 道小题 , 每小题你将听到一段对话 , 每段对话听两遍。在听每段对话前你将有 5秒钟的时间阅读题目；听完后 , 你还有 5秒钟的时间选出你认为最合适的备选答案。 1. What animal are they talking about? 2. Which sport does the boy like best? A. B. C. 3. How does the boy ' s father go to work? A. B. C.

A. C. 4. Where does Kate like to go A. B. B.

leave?A. 9:15. B. 9:50. C. 10:50. 6 . What is the woman going to do this evening? A. Have dinner. B. Visit her sister. C. Drive to the airport 7 . Where are they talking? A. At a train station. B. At an airport. C. A t a bus stop. 8 . How many books did the woman sell? A. Forty-five. B. Twenty. C. Forty. 9 . Who is the youngest among the three? A. Mary. B. Peter. C. J ohn. 10 . When should the man return the book? A. On Wednesday. B. On Thursday. C. O n Friday. 第二部分听对话或短回答问题。本部分你将听到三段对话和两篇短文，各听两遍。听每段对话或短文前，你将有时间阅读相关小题，每小题5秒钟；听完后，每小题你还有5秒钟的时间选出你认为最合适的备选答案。听第一段对话，回答第11-12 小题。 11.What is Amy doing with the paper? A.She is making paper lucky stars. B.She is making paper roses. C.She is making paper birds. 12.Which of the following is TRUE? A.It will be Tom 's mother's birthday next week. B.Amy needs paper and a knife to make the birthday present. C.Tom doesn't think it is fun to do a DIY job. 听第二段对话，回答第13-14 小题。 13.What are they talking about? A. The beautiful view in a picture. B. A girl in a photo. C. Art lessons. 14. What is Sandy good at? A. Sports. B. Taking photos. C. Dancing. 听第三段对话，回答第15-17 小题。 15. What caused the fire? A. A car accident. B. Stoves. C. Lightning. 16. When did the house catch fire? A. In the morning. B. In the afternoon. C. In the evening 17. What was burnt in the fire? [] A. A radio. B. A mobile phone. C. A computer. 听第一篇短文，回答第18-20 小题。请根据短文内容，选择正确答案，完成信息

通信原理期末考试试卷一份

一、单项选择题（每小题3分，共21分） D A B C D B C 1. 以下方法中，（ D ）不能作为增大视距传播的距离的方法。 A. 中继通信 B. 卫星通信 C.平流层通信 D.地波通信 2. 在光纤中，（ A ）。 A. 纤芯的折射率大于包层的折射率 B. 纤芯的折射率小于包层的折射率 C ．纤芯的折射率等于包层的折射率 D. 不能确定纤芯和包层的折射率哪个大 3. 提出部分响应系统的目的是为了提高频带利用率，并（ B ）。 A. 消除码间干扰 B. 加速传输波形的尾巴衰减 C ．降低噪声的影响 D. 使得传输波形的频谱变成理想低通特性 4. 高斯白噪声通过窄带理想带通滤波器后为窄带高斯噪声，后者包络的一维分布为（C ）。 A. 高斯分布 B. 莱斯分布 C. 瑞利分布 D. 均匀分布。 5. 在AM 、DSB 、SSB 、VSB 等4个通信系统中，有效性最好的通信系统是（ D ）。 A. AM B. VSB C. DSB D. SSB 6. 设基带信号为()f t ，载波角频率为c ω，?()f t 为()f t 的希尔伯特变换，则DSB 信号的一般表示式为（ B ）。 A. 0()[()]cos c s t A f t t ω=+ B. ()()cos c s t f t t ω= C. 12?()[()cos ()sin ]c c s t f t t f t t ωω=- D.12?()[()cos ()sin ] c c s t f t t f t t ωω=+。 7.2DPSK 中，若采用差分编码加2PSK 绝对相移键控的方法进行调制，a n 为绝对码，b n 为相对码，则解调端码型反变换应该是（ C ）： A. B. C. D. 二、填空题（每小题2分，共20分） 1．对于AM 系统，无门限效应的解调方法是___相干解调_________。 2.已知FM 波的表达式63()10cos(21010sin(10))s t t t ππ=?+(V)，可求出载波频率为__106 Hz ___ ，已调波的卡森带宽为_11_kHz ，单位电阻上已调波的功率为_50_W 。 3. 在传输数字信号时，如果时域上波形畸变可引起相邻码元波形之间发生部分重叠，造成码间干扰。 4. 多径传播会引起频率选择性衰落 5. 带宽为 6.5MHz 的某高斯信道，若信道中的信号功率与噪声功率谱密度之比为45.5MHz ，则其信道容量为()s MBit C /5.195.6/5.451log 105.626 =+?=。 6. 双极性基带信号，当满足等概条件时，其功率谱无离散谱分量。 7. 2DPSK,2ASK,2PSK,和2FSK,采用相干解调时，抗信道加性高斯白噪声性能从好到坏排列顺序为 2PSK, 2DPSK, 2FSK ，2ASK 。 8. 2DPSK 调制解调系统是为了解决2PSK 系统中的倒π 现象而提出来的。 n n n b a b ⊕=-11 -⊕=n n n b a b 1 -⊕=n n n b b a 11--⊕=n n n b b a

八年级下学期期末英语试题(含答案)

I. 听句子，从A-E五幅图中选出与所听句子内容相符的图片。听完每句话后，你将有5秒钟的答题时间来回答有关小题和阅读下一小题。每句话读两遍。 1. Mario fell off his bike and hurt one of his legs. 2. Watching TV for too long is not good for our health. 3. Let’s play basketball after school. 4. Could you lend me your dictionary? 5. Have you ever been to Shanghai by plane? II. 听短对话，从各小题所给的A、B、C三个选项中选出能回答所给问题的最佳选项。听每段对话前，你将有5秒钟的时间来回答有关小题和阅读下一小题。每段对话读两遍。 6. M: Could you please sweep the floor, Betty? W: Yes, I can. But I must fold my clothes first. 7. M: What’s the weather like in Daye today? W: It’s cloudy. But it rained heavily yesterday. 8. M: Hello, Gina. Long time no see. W: Yes. I had a bad cold last wee k and had to stay at home. 9. M: Alice, you missed the bus this morning, didn’t you? W: Yes. I got to the bus stop at eight. But the bus left fifteen minutes ago. 10. M: Why does Lily feel tired today? W: Because she did her homework late last night and didn’t get

八年级上期末英语试题8含答案

2019学年第一学期八年级学生学业水平测试英语本试卷共五大题，满分100分。考试时间90分钟。注意事项： 1．答题前，考生务必在答题卡上用黑色字迹的钢笔或签字笔填写学校、姓名、试室号和座位号；再用2B铅笔把对应该两号码的标号涂黑。 2．选择题每小题选出答案后，用2B铅笔把答题卡上对应题目的答案标号涂黑；如需改动，用橡皮擦干净后，再选涂其他答案；不能答在试卷上。 3．非选择题答案必须写在答题卡各题目指定区域内的相应位置上；如需改动，先划掉原来的答案，然后再写上新的答案，改动的答案也不能超出指定的区域；除作图可用2B 铅笔外，其他都必须用黑色字迹钢笔或签字笔作答。不准使用涂改液。不按以上要求作答的答案无效。4．考生必须保持答题卡的整洁。考试结束,将答题卡交回。一、单项选择（共10小题；每小题1分，满分10分）从1-10各题所给的A、B、C和D项中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。 1. Don’t worry. There is ________wrong with the computer. It’s only because of the power cut. A. something B. nothing C. anything D. everything 2. There are many famous pictures in the museum, ________the Mona Lisa. A. including B. included C. includes D. to include 3. We can ________ robots ________ help us do housework. A. use; for B. use; to C. used; for D. used; to 4. Ice Age V is one of ________ cartoons in 2016. A. more interested B．the most interested C. more interesting D．the most interesting 5. –I don’t like the white shirt. What about you, Simon? –I don’t like it, ________. I prefer the blue one. A. as well B. too C. also D. either 6. – Our country ________ a lot so far. –Yes. I am sure it will be ________ in the future. A. has changed; well B. changed; good C. has changed; better D. changed; better 7. It will be harmful to your hearing ________ you always listen to music by earphone (耳机). A. if B. so C. and D. but 8. To protect our eyes, we ________ keep enough distance from books when we read them. A. should to B. shouldn’t C. ought to D. ought not to 9. －All the workers went home yesterday ________ Mr. Smith. Why? －Because he was on duty. A. except B. except for C. besides D. beside 10. Tom will be ________. His parents are going to have a party for his ________ birthday. A. fourteen; fourteen B. fourteenth; fourteenth C. fourteen; fourteenth D. fourteenth; fourteen

人教版八年级上册英语期末试卷及答案

人教版八年级上册英语期末试卷及答案距离八年级英语期末考试还有不到一个月的时间了，学生们在这段时间内突击做一些试题是非常有帮助的。下面是为大家精心整理的人教版八年级上册英语期末试卷和答案，仅供参考。人教版八年级上册英语期末试卷题目一. 听力部分(25分) I.听句子, 选择正确答语。(5分) ( )1. A. No, I don t. B. Sorry, I d love to. C. Sure, I d love to. ( )2. A. Twice a month. B. Three times. C. About two weeks. ( )3. A. I went to school. B. I go to the park. C. I m going to visit Australia. ( )4. A. Two spoons. B. Two. C. One cup. ( )5. A. Because they re exciting. B. Because I can t stand them. C. Because they are very boring. II.听简短对话和对话后的问题，选择正确答案。(5分) ( )6. A.Jack. B.Nick. C.Mike. ( )7. A. About twenty-five minutes. B. About twenty minutes. C.About fifteen minutes. ( ) 8. A. A basketball player. B. A famous runner. C. A

通信原理期末考试试题(多套)

66666666666666666666（A卷、闭卷）课程名称通信原理A（2009.12）专业班级题号一二三四五六七八九十总分题分备注: 学生不得在试题纸上答题 (含填空题、选择题等客观题) 一．是非题（正确打√，错误打×，每题2分，共10 分） 1．出现概率越大的消息，其所含的信息量越大。（） 2．随机过程广义平稳则必将严格平稳。（） 3．恒参信道的特性是可以通过线性网络来补偿的。（） 4．由于DSB信号的调制制度增益是SSB的一倍，所以抗噪声性能比SSB好一倍。（）5．2PSK存在反相工作现象，而2DPSK不存在，所

四．已知0 ()(1cos cos 2)cos AM s t K t K t t =+Ω+Ωω，且0 Ω<<ω。 1．画出此已调波的频谱示意图。（3分） 2．画出包络解调器的原理框图。（3分） 3．试求使此AM 信号无包络失真的K 值。（4分）五．若消息代码序列为110000010100001， 1. 画出对应的全占空双极性码波形；（2分） 2. 画出对应的AMI 码波形；（4分） 3. 画出对应的HDB3码波形。（4分）六．图1、图2分别给出两种基带系统传输特性图1 图2 1．试分析两个基带系统无码间串扰的最高码元速率。（6分） 2．设传输信息速率为3Mbps ，图1和图2系统能否实现无码间串扰。（4分）七．设某数字调制系统的码元传输速率为1000Bd ，载波频率为2000Hz 。 1．若发送数字信息为111010，试画出2ASK 信号波形和它的功率谱密度草图。（5分） 2．数字信息不变，试画出2DPSK 信号波形和它的功率谱密度草图（设初始相位为0）。（5分）。八．在脉冲编码调制（PCM ）系统中，若采用13 折线A 律编码，设最小量化间隔为1单位，已知抽样脉冲值为-118个单位：试求：

八年级下册期末英语试卷及答案

八年级下册期末英语试卷及答案一、单项选择： ( ) 1. Mo Yan is one of most popular writers in the world. He was honest boy when he was child. A. a; a B. a; an C. the; a D. the; an ( ) 2.I’m a teenager and I don’t play with soft toys any longer. A. no longer; / B. no; longer C. / ; no longer D. no; any longer ( ) 3. ---How long your uncle this personal computer ? --- Since ten years ago. He wants to buy a new one. A. have; had B. has; bought C. have ; bought D. has; had ( ) 4. Hurry up! The piano concert for five minutes. A. had begun B. has been on C. has begun D. began ( ) 5. --- Long time no see your father! Where has he ? --- He has Beijing for a month. He’ll be back next week. A. been; been in B. gone; been C. been; been to D. gone; gone to ( ) 6. My mother used to the song “Where’s time going?” . Now she is used to it. A. hating; listen B. hated; listened to C. hate; listening to D. hating; listening

八年级上学期考试英语试题及答案

期中考试八年级英语试卷 Ⅰ听力部分（20分）（本大题共20分，每小题1分）第一部分听对话回答问题本部分共有10道小题，每小题你将听到一段对话，每段对话听两遍。在听每段对话前，你将有5秒钟的时间阅读题目；听完后，你还有5秒钟的时间选择你认为最合适的备选答案。在听到“嘀”的信号后，进入下一小题。 1.Which sport is the most popular in their school? A. B. C. 2.How will the woman go to Tiansheng Bridge Park? A. B. C. 3. Where did Amy visit last year? . A A. B. C. 4. What will the girl be when she grows up? A. B. C. 5.What does Jack need for the DIY job? A. B. C. 6. What does the woman want the man to do? A. She wants the man to see a film with her. B. She wants the man to visit a museum. C. She wants the man to play basketball. 7. Who has the fewest apples？ A. Simon B. Millie C. Daniel

8. How will they make their school more beautiful? A. By planting some young trees inside their school. B. By planting some young trees around their school. C. By doing some cleaning. 9. How much should the woman pay for the tickets? A. 64 yuan, B. 72 yuan. C. 96 yuan. 10. What does Sandy mean? A. She likes doing DIY. B. She knows little about DIY. C. She knows a lot about DIY. 第二部分听对话和短文回答问题你将听到两段对话和一篇短文，各听两遍。听每对话或短文前，你将有时间阅读相关小题，每小题5秒钟；听完后你仍有5秒钟的时间选择你认为最合适的备选答案。听第11段材料，回答11--12题。 11. Who did Lisa go shopping with? A. Her friend. B. Her sister. C. Her mother. 12. How often does Lisa go shopping? A. Once a week. B. Twice a week. C. Three times a week. 听第12段材料，回答13--15题。 13. How is the man going to the zoo tomorrow? A. By bus. B. By car. C. On foot. 14. When are they going to meet? A. At 9 a.m. B. At 8 a.m. C. At 10 a.m. 15. Where are they going to have lunch? A. In the zoo. B. At Mr. Wu’s home. C. At school. 听第13段材料，回答16—20题。 16. How old is Jenny? A. 14. B. 15. C. 16. 17. What is their favorite color? A. Red. B. Yellow. C. White.

人教版八年级上册英语《期末考试试卷》(附答案)

2020-2021学年第一学期期末测试八年级英语试题学校________ 班级________ 姓名________ 成绩________ 第Ⅰ卷 Ⅰ. 听力测试。第一节听一遍,根据你所听到的句子,从A、B、C三个选项中选出最恰当的答语,并把答题卡上对应题目的答案标号涂黑。 1. A. Sure. B. No, she can’t. C. Never mind. 2. A. Yes, he will. B. No, they won’t. C. Y es, they do. 3. A. First, peel an orange. B. It’s easy. C. Finally, drink it. 4. A. For two hours. B. Every day. C. Twice. 5. A. Not at all. B. Sorry. C. Thanks. 6. A. In a week. B. Last week. C. On the weekend. 第二节听一遍,根据你所听到的对话和问题,从A、B、C三个选项中选出正确答案,并把答题卡上对应题目的答案标号涂黑。 7. A. She watched TV. B. She went somewhere. C. She prepared for a test. 8. A. a piano lesson. B. A big dinner. C. A soccer game. 9. A. In the school. B. In the hospital. C. In the bookstore. 10. A. On foot. B. By train. C. By air. 11. A. The woman. B. Tom. C. The winner. 12. A Monday. B. Tuesday the 1st. C. January 1st. 第三节听两遍,根据你所听到的长对话,从A、B、C三个选项中选出正确答案,并把答题卡上对应题目的答案标号涂黑。听下面一段材料,回答第13和14小题。

通信原理期末考试复习题(推荐文档)

1、某个信息源由“1”、“0”两个符号组成。其出现概率分别为1/4、3/4，则信息源中符号“1”的信息量为（ 2 ）bit。 2、若一平稳随机过程的自相关函数为R(τ)，则R(0)是该平稳随机过程的（总）功率。 3、若语音信号的频率在300-3400Hz之间，则按照抽样定理理论上信号不失真的最小抽样频率为（6800 ）Hz。 4、在相同信噪比的情况下，采用相干检测法对2ASK、2PSK和2FSK解调之后，误码率最低的是（2PSK ）。 5、通信系统中的同步类型主要有载波同步、（位同步）、群同步和网同步。 6、设有一个信号可表示为：t≥0时，x(t)=4exp(-t)；t≥0时，x(t)=0。则该信号是功率信号还是能量信号？（能量信号）。 7、对一模拟信号进行数字化时，若抽样频率为1000Hz，量化电平数为16，则数字信号的传输速率为（4000 ）b/s。 8、为了能纠正2个错码，同时检测3个错码，则要求的最小码距为（ 6 1、某个信息源由A、B、C、D四个符号组成，出现概率均为1/4。这些符号分别用二进制码组00、01、10、11表示。若每个二进制码元用宽度为5毫秒的脉冲传输，则该信息源的平均信息速率和码组速率分别为（ C ）。 A、200b/s和200波特 B、100b/s和200波特 C、200b/s和100波特 D、100b/s和100波特 2、模/数转换的三个步骤是依次（ A ）。 A、抽样、量化和编码 B、量化、抽样和编码 C、量化、抽样编码和 D、编码、量化和抽样 3、模拟通信系统中的线性调制方式主要有（ B ）。 A、单边带调制、相位调制、双边带调制、频率调制 B、振幅调制、单边带调制、残留边带调制、双边带调制 C、单边带调制、残留边带调制、双边带调制、频率调制、振幅调制 D、单边带调制、相位调制、双边带调制、残留边带调制 5、无码间串扰系统的传输函数的特性为（ B ）。 A、传输函数为实函数，且在带宽W处偶对称 B、传输函数为实函数，且在带宽W处奇对称 C、传输函数为虚函数，且在带宽W处偶对称 D、传输函数为虚函数，且在带宽W处奇对称 6、右图中表示的调制方式为基本的数字调制系统中的哪种调制方式（ C ）。 A、2ASK B、2PSK C、2FSK D、2DPSK 8、数字系统的最佳接收准则中的“最佳”指的是（ D ）。 A、码元速率最佳 B、传输速率最高 C、信息速率最大 D、错误概率最小、DSB调制系统和SSB 13 ------3 因为单边带信号所需带宽仅带的大1. 什么是门限效应？AM信号采用包络检波法解调时为什么会产生门限效应？答：门限效应：就是当包络检波器的输入信噪比降低到一个特定的数值后，检波器输出信噪比出现急剧恶化的一种现象。因为，门限效应是由包络检波器的非线性解调作用所引起的，而AM信号采用了包络检波法，所以会产生门限效应。 2.FM系统中采用加重技术的原理和目的是什么？答：FM系统中采用加重技术的原理是针对鉴频器输出噪声谱呈抛物线形状，而高频端的信号谱密度最小，目的是提高调频解调器的高频端输出信噪比。 3.等概时对于传送单极性基带波形和双极性基带波形的最佳判决门限各为多少？为什么答：A/2和0。因为此时误码率最低。 4.与二进制数字调制相比较，多进制数字调制有哪些优缺点？答：优点是提高了频带利用率，缺点是抗噪声性能降低。 5.随参信道对所传信号有何影响？如何改善？答：对信号传输有衰耗，并随时间而变；传输的时延随时间而变；产生多径传播，而多径传播对信号传输的

八年级期末考试英语试题下学期

八年级期末考试英语试题下学期x 一﹨听力部分（共25小题，计25分；每小题约有8秒钟答题的时间）（一）录音中有五个句子，每个句子听两遍，然后从每小题A﹨B﹨C中选出能对每个句子做出适当反应的答语（5分） 1. A. It’s my pleasure B. Thank you C. OK. Sorry! 2. A. It doesn’t work B. It’s beautiful C.I like it very much 3. A. By train B. Two weeks C. Once a week 4. A. Thank you B. You’’m not happy 5. A. I have some hobbies B. I played chess C. I like playing chess （二）录音中有三个句子，每个句子对应一幅图片，每个句子听两遍，然后选择与句子相对应的图片（3分） 6._______________ 7._______________ 8. _________________ （三）录音中有六组对话，听对话两遍后，从每小题A﹨B﹨C中选出能回答所给问题的正确答案。 9. What does Mike want to buy? A. A raincoat B. A T-shirt C. A sweater 10. How often does the bus run ? A. Every ten minutes B. Every twenty minues. C. Every thirty minutes. 11. How’s the weather tomorrow? A. Sunny B. Rainy C. Windy. 12. Whom did Jenny spend her holidays with? A. John’s grandpa B. John C. John’s grandma

八年级上期末英语试卷

黄山文峰学校2013-2014学年第一学期期末模拟考试八年级英语试题命题人：方小京考试时间：试卷满分：100 听力部分（15分） Ⅰ.听句子，选择与其相对应的单词。每个句子读一遍。（5分））1. A. eraser B. book C. ruler ）2. A. play ping-pong B. play basketball C. play soccer ）3. A. hotel B. factory C. shop ）4. A. running B. swimming C. jumping ）5. A. chicken B. dogs C. cats Ⅱ.听五段短对话，选择正确答案。每段对话读两遍。（5分））6. How many times has the man been to America? A. Once B. Twice C. Three times ）7. What will the man do to stay cool? A. Buy some ice cream B. Go swimming C. Stay at home ）8. What are they talking about? A. Water pollution B. Different kinds of fishes C. People in the country ）9. When did the man arrive at the meeting room? A. At 8:05 a.m. B. At 8:10 a.m. C. At 8:15 a.m. ）10. What does Dave mean? A. He wants more fish. B. He wants to cook fish. C. He do esn‘t want to eat any more. Ⅲ.听长对话，选择正确答案。对话读两遍。（5分） ( ）11. Tom came to the countryside when he was_____. A. seven B. eight C. nine ( ）12. Tom had lived in the countryside for ____years. A. three B. four C. five ( ）13. The birds were singing and jumping in the trees______. A. in Tom‘s garden B. on Tom‘s farm C. outside Tom‘s window ( ）14. The swallows(燕子) were busy flying out to______. A. look for food B. look for a house C. sing ( ）15. The number of the birds is getting smaller because______. A. People kill many of them B. the environment is getting worse C. there are not enough trees 笔试部分（85分） Ⅳ.单项选择。（每题1分，共20分） ( )16.–Can I have something to eat, Mum? –Sorry, there is_____left in the fridge. A .none B. nothing C. no one D. anything ( )17. –He, together with his parents_____going to visit Shanghai in July. How about you? –I‘m afraid not I have to stay at home _______. A. are; on my own B. is; by myself C. is; by my own D. are; on myself ( )18.I was so tired that I _____couldn‘t walk farther. A. almost B. hardly C. never D. suddenly ( )19. She doesn‘t look after her _____. She often eats_____food. A. healthy; healthy B. health; healthy C. healthy; unhealthy D. health; unhealthy ( )20.Maria_____drawing than her twin sister. A. is better for B. is better at C. is good for D. is good at ( )21.I don‘t mind what _________. A. do you think of me B. do you like me C. you think of me D. you like of me ( )22. It‘s too hot. Would you mind my ___ the window?—___. Do it as you like, please. A. to open; OK B. opening; Certainly not C. opening; Of course D. open; Good idea ( )23. As my best friend, she often ____me in chemistry. But this time, I ____ the chemistry competition. A. beat; beat B. beats; won C. wins; beat D.wins;wins ( )24. -- Must we clean the classroom now?---No, you _______. A. mustn't B. may not C. can't D. needn't ( )25. —Who‘s Mr. Wang?—He is one of in our school. A. best teacher B. the best teachers C. good teacher D. the good teacher ( )26.Chairman Xi arrived in Moscow _____ the morning of March the morning of March 22,2013.It was his first visit to Russia. A. in B. at C. on D. for ( )27.He hardly hurt himself in the accident, _______? A. doesn‘t he B. didn‘t he C. did he D. does he ( )28. –Excuse me, may I use your dictionary? –______. It‘s over here, on the self. A. Help yourself B. Here you are C. You‘re welcome D. It‘s my pleasure ( )29.The volunteers sent _____books to a mountain village school on Children‘s Day. A. two hundreds of B. two hundred of C. two hundreds D. two hundred ( )30.My cousin have collected stamps for two years. They have ____ stamps from different countries. A. few B. many C. much D. little ( )31.They can wear _______ clothes. A. themselves B. they own C. their own D. them ( )32. –What can I do for you? –I‘d like two_____. A. bottle of orange B. bottle of oranges C. bottles of orange D. bottles of oranges ( )33.Finally, put____ piece____ bread ____ the top. A. another; of; in B. other; of; in C. another; of; on D. other; of; on ( )34.-Could you please ____ the radio a bit? It‘s too loud. –Sorry, I‘ll do it right away.