《名师一号》2014-2015学年高中英语（外研版）必修二 综合测评(二)(MODULE 2).doc

1、高考资源网（） 您身边的高考专家综合测评(二)(Module 2)第卷第一部分听力(共两节，满分30分)第一节(共5小题；每小题1.5分，满分7.5分)听下面5段对话。每段对话后有一个小题，从题中所给的A、B、C三个选项中选出最佳选项，并标在试卷的相应位置。听完每段对话后，你都有10秒钟的时间来回答有关小题和阅读下一小题。每段对话仅读一遍。1When did the woman see the mans elder sister?A. Yesterday. B. Two days ago.C. Three days ago.2When did the plane leave?A. 12：05.

2、 B. 11：35.C. 11：50.3What does the woman mean?A. She was too sick to attend classes.B. She was so confused about the class schedule.C. The man has mistaken her for someone else.4When will the dinner be ready?A. At 11 oclock. B. At 11：30.C. At 12 oclock.5Where are the two speakers?A. On a playground.B

3、. In a clothes factory.C. In a department store.第二节(共15小题；每小题1.5分，满分22.5分)听下面5段对话或独白。每段对话或独白后有几个小题，从题中所给的A、B、C三个选项中选出最佳选项，并标在试卷的相应位置。听每段对话或独白前，你将有时间阅读各个小题，每小题5秒钟；听完后，各小题将给出5秒钟的作答时间。每段对话或独白读两遍。听第6段材料，回答第68题。6Where does the conversation take place?A. In a hotel. B. At a booking office.C. At a friends

4、house.7What will the man probably do in a few days?A. Fly to another country. B. Come to the same hotel. C. Drive here to visit friends.8What can you learn from the conversation?A. The man is very satisfied with the stay here.B. The man is the husband of the woman.C. The man is the friend of the wom

5、an living in the South Bay.听第7段材料，回答第911题。9What size does the woman want?A. Size 4. B. Size 6.C. Size 10.10How many colors does the ski jacket come in?A. 4. B. 5.C. 6.11What does the woman think of the jacket?A. Its too expensive.B. Its too big.C. She doesnt like the colors.听第8段材料，回答第1214题。12When wi

6、ll the plane take off?A. At 5：00. B. At 4：30.C. At 5：30.13Where is Jane going?A. She is going straight to New York.B. She is going straight to Washington.C. She is going to New York then to Washington.14What is Jane probably going to do in Washington?A. To go to school.B. To go to work.C. To stay wi

7、th her sister.听第9段材料，回答第1517题。15Where does the woman come from?A. Greece. B. Spain.C. Sweden.16Whats the climate like in the womans country?A. Terrible. B. Pleasant.C. Freezing.17When is summer time in the womans country?A. From April to May.B. From September to November.C. From June to August.听第10段

8、材料，回答第1820题。18Who is the speaker?A. A newsman. B. A teacher.C. A student.19Who has he talked with?A. Workers and news reporters.B. Workers, teachers and students.C. Teachers, workers and peasants.20What do you think of the speaker?A. He is friendly to the Chinese people.B. He has many Canadian reade

9、rs.C. He has known China very well before.答案15BCCBC610ABACB1115ABCAA1620BCABA听力材料Text 1M: Have you seen my elder sister lately?W: Yes, the day before yesterday.Text 2M: The flight for Japan left 15 minutes ago.W: Thats right. Its already 12：05.Text 3M: Im surprised to see you in the class today. I h

10、ear you were sick.W: Me? You got me mixed with someone else.Text 4W: Whats the time by your watch?M: Its eleven sharp.W: I feel hungry now. I think it must be time for lunch.M: You have to wait for another half hour.Text 5W: May I help you?M: Yes, Id like to try on some sports jackets. I prefer some

11、thing like the one Im wearing.Text 6M: Well, well certainly stay here again next time when were passing through.W: Good! Do let us know in advance. I will try to get you the same room.M: That would be lovely. It may be quite soon in fact.W: Oh, how is that?M: Well, well drive into the South Bay in t

12、he next couple of days. And we may come back this week.W: Do give us a ring if you decide to. I hope you have a pleasant trip.Text 7W: Excuse me. Could you help me?M: Certainly. What can I do for you?W: Were looking for a girls ski jacket. I like this style. Do you have it in size 10?M: Let me see .

13、 size 4,6,8 . here we are. Size 10.W: Oh, I dont really like yellow. What other colors does it come in?M: It comes in red, pink, light blue and black.W: The pink is nice. How much is it?M: Its $160.W: Oh, well, thats too expensive. Well have to think about it.Text 8M: Id like to see you off, Jane, b

14、ut I cant get to the airport until five oclock.W: Im afraid Ill have left by then. My plane takes off at 4：30.M: Thats bad! Youre going straight to Washington, arent you?W: No. Im staying with my sister in New York. She isnt there at the moment but shell have arrived by Monday morning. Ill spend a c

15、ouple of weeks with her and then go to Washington. Classes will already have started by then.M: Well, I wish you luck.Text 9M: Where do you come from?W: I come from Greece.M: Whats the climate like in your country?W: Its very pleasant.M: Whats the weather like in spring?W: Its often windy in March.

16、It is always warm in April and May, although it rains sometimes.M: Whats it like in summer?W: Its always hot in June, July and August. The sun shines every day.M: Is it cold or warm in autumn?W: Its always warm in September and October. Its often cold in November and it rains sometimes.M: Does it sn

17、ow in winter?W: Its often cold in December, January and February. It snows sometimes.Text 10M: Im very glad to be here with you. Im from Canada. Im a news reporter. This is my first visit to China. Ive looked around your city. Ive visited many factories and schools and talked with the workers, teach

18、ers and students. All this has helped me to understand China better than before. Im now writing a book about China. In the book Im going to tell my Canadian readers what Ive seen and heard in your country. I think my book will help Canadians to understand China and Chinese people so as to improve th

19、e friendship between our two countries.第二部分阅读理解(共两节，满分40分)第一节(共15题；每小题2分，满分30分)阅读下面短文，从每题所给的四个选项(A、B、C和D)中，选出最佳选项。AThe first robots were invented in the 1920s. Robots have appeared in Hollywood films such as Robocop and The Terminator. The robots in these films are stronger, faster and more intellig

20、ent than people.In real life, robots are mainly used in factories. They do many different jobs. Usually these jobs are too dangerous, difficult or boring for humans.Robots also help disabled people and people who cannot look after themselves. For example, scientists are making a robot to help blind

21、people. Nowadays many blind people have a dog to help them. This dog is called a guide dog. In the future, robot dogs might take the place of these guide dogs.One robot guide dog is called Meldog. It has wheels. It usually “walks” in front of its owner. It is very clever. It knows the speed of its o

22、wners walk. Meldog talks to its owner by radio. The owner wears a special belt. This belt sends instructions to the owner from Meldog such as “Stop here”， “Turn left” and “Turn right”In the United States, another type of robot helps disabled workers. This robot, called Kilroy, helps disabled compute

23、r operators. The robot hears the sound of its owners voice. It follows instructions such as “Turn the page” and “Make a cup of coffee”. This robot will bring its owner tissue paper when he or she sneezes!Robots are also used in American hospitals. They can do simple jobs. For example, they shave pat

24、ients and brush their teeth and take meals from the kitchen to the patients rooms. They never get lost because they have a map of the hospital in their computer memory.21Some robots in real life are _.A. dangerous B. boring C. film stars D. factory workers答案与解析D根据第二段第一句“In real life, robots are main

25、ly used in factories.”在现实生活中机器人主要被用在工厂里。D项正确。22Some disabled people need robots to _.A. make robots B. become scientists C. look after themselves D. do dangerous jobs答案与解析C根据文章举的例子可知有的机器人被用于给盲人导航，帮助残疾的电脑操作员，还有的在医院里照顾病人。本题选择C项。23Meldog is a _.A. blind dog B. robot scientist C. real dog D. robot guide

26、 dog答案与解析D根据第四段第一句“One robot guide dog is called Meldog.”一种机器人导盲犬叫作Meldog。D项正确。24The robots used in American hospitals can do the following except _.A. make a map B. shave patientsC. brush the patients teeth D. take meals from the kitchen to the patients rooms答案与解析A根据最后一段第三句“For example, they shave

27、patients and brush their teeth and take meals from the kitchen to the patients rooms.”例如，他们给病人刮胡子、刷牙和给病人把饭送到病房，没说会做地图。A项正确。B Did you know there is a substance that can kill you even if you dont want it? Many adults and children die from it. Its called secondhand smoke. It comes from the smoke that i

28、s breathed out by a smoker, as well as the smoke that comes from the end of burning cigarettes. Its almost as lethal as smoking a cigarette.Secondhand smoke contains over 4,000 chemicals, and of those, 200 are poisonous and 43 can cause cancer. It causes about 3,000 lung cancer deaths and 35,000 hea

29、rt disease deaths to nonsmokers each year. Some of the chemicals breathed in are lead, formaldehyde (a poisonous, colourless gas), benzene (colourless liquid from oil) and ammonia (a smell gas)Every time someone lights a cigarette near you, you are being forced to breathe in all those chemicals. You

30、 can get a number of diseases many incurable (不能治愈的) from secondhand smoke, but it is especially dangerous for children. It is estimated that secondhand smoke is responsible for between 150,000 and 300,000 lower respiratory (呼吸的) tract (消化系统) infections (感染) in young children and because of this, be

31、tween 7,500 and 15,000 children are hospitalized each year. So if you smoke, try to give up! Otherwise, avoid smoky areas and breathe fresh air.25. The passage is written to tell us_.A. not to smokeB. smoking is harmful to smokers and nonsmokersC. how to give up smokingD. smoking should be banned in

32、 public places答案与解析B通读全文可知，整篇文章说的就是吸烟对吸烟者本身和被动吸烟者的危害。故选B项。26. The underlined word “lethal” in Paragraph One means_.A. harmful B. expensiveC. useful D. cheap答案与解析A根据第二段和第三段所描述的被动吸烟所造成的危害可知，被动吸烟跟吸烟者本身所受到的危害同样大，所以选A项，表示同样有害。27. Which of the following words can best describe the authors attitude towards

33、 smoking in public?A. Interested. B. Worried.C. Angry. D. Sad.答案与解析B通过第三段的描述可以看出由于吸烟的巨大危害，作者为吸烟者感到非常担心，并建议他们不要吸烟，远离吸烟区。28. The second paragraph mainly tells us_.A. the great harm of secondhand smokeB. the basic parts of smokeC. why the number of people getting diseases keeps increasingD. how to redu

34、ce the effect of smoke答案与解析A文章第二段通过几个数字和烟雾中所含有的有害成分来说明被动吸烟的害处。CHe walked slower as he came to the block where he knew the building was. It was probably in the middle of the block, probably that storefront that was lit. It was 7：30 and all the other stores were closed. Yeah, that must be it, he thoug

35、ht to himself. He almost stopped as he pictured himself walking into the room. Everyone would be looking at him. What would he say? “Good evening. Im Spencer.” No. Maybe he would ring the bell outside and have someone come to the door. They could walk in together and then he wouldnt be alone. He alr

36、eady knew what he would tell them when they asked him why he had come. He had thought a lot about the easiest thing for him to say. “I came to learn to improve myself.” That sounded good. They would know what that meant. He fingered the pencil in his jacket pocket. He hadnt known what else to bring.

37、The same sign was in the window of the storefront. “402 Main St. Adult Learning Center.”He took a deep breath and continued to walk slowly to the window. He looked inside as he passed. There was no one there. Was he too early? Would he be the only one to come? He walked to the corner and stopped. He

38、 knew he wasnt going home. He just needed a couple of more minutes to think about it. He turned round and walked faster now back to 409 Main St. He turned the knob (门把) but the door wouldnt open.A woman walked by.“Oh, theyre closed today，” she said. “Its some kind of holiday or something . Theyre us

39、ually open every day, though. Come back tomorrow.”He turned and looked at her, and then nodded. “Thank you，” he said. “Maybe Ill do that. Ill see how I feel tomorrow.”29. How did the man in the story feel about going to the Adult Learning Center?A. Uninterested. B. Excited.C. Nervous. D. Calm.答案与解析C

40、从全文可以看出，这名男子对于去成人学习中心始终是胆怯、紧张的。30. Why was the center closed?A. Because it was a weekend.B. Because Spencer came too early.C. For some unknown reason.D. Because he was the only one to come.答案与解析C依据“Its some kind of holiday or something .”确定答案为C项。31. What is the authors main purpose in this passage?A

41、. To encourage adults to go to education classes.B. To tell why adult education classes are sometimes closed.C. To describe what 402 Main Street at night look like.D. To describe a mans feeling about going to an adult class.答案与解析D要求学生推测作者的写作态度和目的。作者在这篇文章中通过对一位男子进成人学习中心的描写，表现了成年人对进修学习、培训的矛盾心理：他们既想不断学

42、习，充实、提高自己，又怕别人笑话。32. Which of the following is NOT true according to the passage?A. The man often went to the Adult Learning Center before.B. The man didnt walk into the Adult Learning Center at last.C. The man brought nothing in his pocket except a pencil.D. The woman didnt work in the Adult Learni

43、ng Center.答案与解析A从第一段可以看出，这名男子知道学习中心的位置，但以前从没去过。否则，他不会这么紧张，也不用想象走进学习中心的情景了(pictured himself walking into the room)。所以A项是错误的。DAMERICANA HOTEL CRYSTAL CITYConvenient location 5 minutes from Washington D. C. and one block to Crystal City METRO (地铁), Crystal City Underground. Free Parking, free Deluxe Co

44、ntinental Breakfast and free Hotel Shuttle (区间公共汽车) Service to Ronald Reagan Washington National Airport. 14000 Jefferson Davis Hwy (endurance on S. Eads St.)Phone (703) 9793722DAYS INN ARLINGTONDays Inn Arlington is located two miles from the Pentagon, Lincoln Memorial. There is a restaurant which

45、serves American style food, plus two meeting rooms and an outdoor pool. Free shuttle service runs to the Rosslyn Metro Station. Free parking is available on the property. Experienced staff welcome our guests. Phone(703)5250300THE HIGHLANDER MOTOR INNComfortable rooms at moderate rates. Convenient lo

46、cation only minutes away from Washington area attraction. Near VA Square METRO Station and Ballston Commons Shopping Mall. Free continental breakfast, free parking. Phone (703)5244300HYATT REGENCY CRYSTAL CITYConveniently located next to Washington National Airport and two miles from Washington D. C

47、 Free Shuttle to and from National Airport, metro, local restaurants and shopping. Experience a view to remember at our rooftop restaurant“Chesapeake Grill.”Call for Reservations. Phone (073)4181234133If you want to stay in a hotel which provides free parking and free breakfast, which telephone numb

48、ers will you ring to ask for further information?A. (703)9793722 or (703)5244300. B. (703)5244300 or (073)41812341. C. (073)41812341 or (703)5250300. D. (703)5250300 or (703)9793722. 答案与解析A第一则广告和第三则广告提供免费早餐和免费停车场。A项正确。34Which hotel is close to airports?A. Americana Hotel Crystal City. B. Days Inn Ar

49、lington. C. Hyatt Regency Crystal City. D. The Highlander Motor Inn. 答案与解析C从第四则广告第一句Conveniently located next to Washington National Airport可知，C项正确。35Steven loves the idea of having delicious meal while enjoying the night view of Washington D. C. He will probably reserve a room by calling _.A. (703)

50、5244300 B. (073)41812341 C. (703)5250300 D. (703)9793722答案与解析B第四则广告中说有饭馆且到华盛顿的距离只有两英里。B项正确。第二节(共5小题；每小题2分，满分10分)根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。Do you want to improve the way you study? Do you feel nervous before a test? Many students say that a lack of concentration (专心) is their biggest p

51、roblem. _36_ If so, use these tips to help you.Study techniques (技巧)_37_ You shouldnt sit somewhere that you use for another purpose. For example, you always study at the desk, but when you sit on a sofa to study, your brain will think it is time to relax.Before sitting down to study, bring together

52、 all the equipment you need. _38_ If your study desk or table is needed when you are not studying, store all your equipment in a box beside it.Dont try to do a lot of things in one study period. _39_ If you need a break, stand up and walk around for a few minutes, but try not to telephone a friend o

53、r have something to eat.Testtaking skillsAll your hard work will be for nothing if you are too nervous or tired to take your test. Getting plenty of rest is very. _40_When you enter the examination room, find your seat and sit down. Breathe slowly and deeply. Check the time on the clock during the t

54、est, but not too often.A. Dont watch TV while you are studying.B. Finish one thing before beginning another.C. You should always study in the same place.D. It is a better idea to have a longterm study plan.E. This means that you mustnt study all night before your test.F. It has a negative influence

55、on their study and their test results.G. If you are studying English, have textbooks, pens and a dictionary at hand.答案36.F37.C38.G39.B40.E第三部分英语知识运用(共两节，满分45分)第一节完形填空(共20小题；每小题1.5分，满分30分)阅读下面短文，从短文后各题所给的四个选项(A、B、C和D)中，选出可以填入空白处的最佳选项。The problem started when the family moved and Chris switched school

56、s. He _41_ friends with a new party of kids, some of _42_ used drugs. The first time Chris used cocaine was with friends at Larrys house. Everyone _43_ their money to buy few grams of cocaine. Larry told them, “Its _44_ as long as you dont use it too often. It wont _45_ you into an addict like other

57、 drugs.” _46_ the following year, the group tried crack along with cocaine. Chris boasted, “I can _47_ this matter！” Larry agreed. “_48_ you only take a little bit, youll be OK，” he said. He sold it to them “at cost” and described it as “pure cocaine”. When one friend ended up in the _49_ from an ov

58、erdose (服药过量), Chris thought, “Thatll _50_ happen to me. Since Im mostly smelling the drug, I wont have any problems.”At 16, Chris _51_ school. When his parents tried to change his mind, he left home _52_ telling them where he was going. He _53_ two weeks working at a pizza shop before getting _54_

59、for stealing money. Thats when he started selling cocaine. “Ill only do this _55_ I get back on my feet，” he told himself. Chriss _56_ found him living alone in a rundown part of town. A school friend had called the family to tell them where he was. “It _57_ saved my life，” Chris says. “I was half d

60、ead.”To pay for Chris to enter a drug treatment centre, his dad _58_ a second job. Chris is _59_ to getting treatment. Now hes able to see colours again. In the depth of his addiction, he saw everything _60_ black and gray.41. A. had B. refusedC. made D. hated42. A. whom B. themC. which D. who43. A.

61、 drew B. contributedC. pushed D. spent44. A. dangerous B. securityC. danger D. safe45. A. turn B. haveC. get D. make46. A. After B. WhileC. During D. When47. A. solve B. dealC. handle D. control48. A. As though B. As long asC. Even though D. If only49. A. hospital B. prisonC. police D. bed50. A. alw

62、ays B. oftenC. seldom D. never51. A. ran away from B. broke away fromC. dropped out of D. fled from52. A. without B. withC. except D. except for53. A. used B. spentC. got D. asked54. A. fired B. killedC. caught D. burned55. A. when B. afterC. unless D. until56. A. school B. holidayC. family D. frien

63、ds57. A. like B. maybeC. probably D. possibly58. A. had B. tookC. worked D. founded59. A. hateful B. forgetfulC. grateful D. acceptable60. A. for B. withC. in D. as答案与解析41Cmake friends (with)是固定搭配，意为“(和)交朋友”。42A非限制性定语从句，介词提前且关系代词在句中作宾语，指代人，故关系代词用whom。43B此处表示所有人都把自己的钱贡献出来，其余三个动词均与语境不符。44D由后面条件状语从句可知，

64、 Larry认为不经常使用cocaine是不会有危险的，故选D项。45A“它不会像其他毒品一样把你变成一个瘾君子”。turn . into . 意为“把变成”，与语境相符。46C此处后接一名词短语而非从句，故选用during, 意为“在期间”。47Chandle为“处理；应付”的意思，相当于deal with。48Bas long as引导条件状语从句，意为“只要”， even though引导让步状语从句； if only“要是就好了”，常用于虚拟语气中。49A服药过量的结果就是去医院救治。50D根据后文解释，他自认为他主要是闻毒品的气味，所以认为该类惨事是决不会发生在自己身上的。51Cdr

65、op out of school意为“辍学”，是固定搭配。52A本题考查without短语作伴随状语。Chris十六岁辍学，父母极力劝说，他便离家出走，没告诉家人去处。53B只有spend可构成“spend time (in) doing sth.”结构。54Aget fired意为“被解雇”。如果只是被逮到而没被开除的话，就不会有“卖海洛因”的事情了，因此排除C项。55Duntil引导时间状语从句。56C根据后一句话中的“. had called the family”，可知是他的家人发现的。57CA项容易排除，后面三项只有C项表示的可能性最大。58Btake表示“得到；获得”的意思，相当于

66、find。59C根据后面的意思，他配合戒毒，并且身体状况好转，所以是“感激的”。60Cin此处为“用”的意思。第卷第二节(共10小题；每小题1.5分，满分15分)阅读下面材料，在空白处填入适当的内容(不多于3个单词)或括号内单词的正确形式。In the toys section, I noticed a small boy of about five years old, pressing against his chest. He kept on _61_ (touch) the hair of the doll and looked very sad. I wondered to _62_

67、 he wanted to give the doll. So I walked towards him and asked him all about it.“It is the doll _63_ my sister loved most and wanted so much for this Christmas. She was so sure that Santa Claus would bring it to her.”I told him not to worry. However, he _64_ (reply) sadly, “No, Santa Claus cannot br

68、ing it to where she is now. Ill have to give the doll to my mother so that she can give _65_ to her when she goes there.”His eyes were filled with _66_ (sad) while saying this.“Recently, my sister _67_ (go) to be with God. Daddy said that Mommy will also join God very soon, so I think she can bring

69、the doll _68_ her to give it to my sister.”My heart almost stopped beating _69_ (complete). The little boy looked up at me and said, “I told Daddy to tell Mommy not to go and ask her to wait _70_ I come back from the store.” 答案61.touching62.whom63.that64.replied65it66.sadness67.has gone68.withpletel

70、y70until第四部分写作(共两节，满分35分)第一节短文改错(共10小题；每小题1分，满分10分)假定英语课上老师要求同桌之间交换修改作文，请你修改你同桌写的以下便条。便条中共有10处错误，每句中最多有两处。错误涉及一个单词的增加、删除或修改。增加：在缺词处加一个漏词符号()，并在其下面写出该加的词。删除：把多余的词用斜线()划掉。修改：在错的词下画一横线，并在该词下面写出修改后的词。注意：1.每处错误及其修改均仅限一词。2只允许修改10处，多者(从第11处起)不计分。Dear Jerry，Im glad to receive you letter asking me what Id li

71、ke to be in the future. To be honest, I had dreamed of becoming a doctor since I was nine. I hurt one of my leg one day, that made me feel that I would not be able to walk any more. Unluckily, I was able to leave my bed a month later with the help with a doctor, who was very friendly and carefully.

72、He gave me the courage I needed it to recover. Whats more, while I was in hospital, I see many sick people. Since then Ive decided to be a doctor so that I can work for people who are sick and need my help. I believe my dream will be come true one day if I study hard now.Yours，Lisa答案Dear Jerry，Im gl

73、ad to receive letter asking me what Id like to be in the future. To be honest, I dreamed of becoming a doctor since I was nine. I hurt one of my one day, made me feel that I would not be able to walk any more. ， I was able to leave my bed a month later with the help a doctor, who was very friendly a

74、nd . He gave me the courage I needed it to recover. Whats more, while I was in hospital, I many sick people. Since then Ive decided to be a doctor so that I can work for people who are sick and need my help. I believe my dream will come true one day if I study hard now.Yours，Lisa第二节书面表达(满分25分)请写一篇吸烟

75、危害的短文。内容要点：1. 吸烟会导致许多疾病，甚至一些危及生命的疾病；2. 吸烟不但对吸烟者自己有害，也严重影响不吸烟者的健康；3. 据报道，美国每年至少有32万人因吸烟而丧生目前约有四千万人仍在吸烟；4. 可喜的是，越来越多的人已认识到其危害，开始戒烟；5. 青年学生不应该养成这一恶习，如有这一习惯，应尽早戒除。_范文I think smoking is harmful to our health. I hope that smokers will give up smoking from now on.Smoking cigarettes can lead to heart diseas

76、e, cancer and other health problems. As we know, it dose great harm not only to smokers themselves, but also to those who dont smoke.It is reported that at least three hundred and twenty thousand Americans are killed by smoking each year. And about 40 million smokers continue to smoke cigarettes today. Fortunately, more and more people have come to realize the danger of smoking and begin to stop it.As a result, you shouldnt form such a habit. I hope you will make up your mind to stop smoking, for it is easy to do away with cigarettes in the beginning- 23 - 版权所有高考资源网