欢迎来到163文库! | 帮助中心 精品课件PPT、教案、教学设计、试题试卷、教学素材分享与下载!
163文库
全部分类
  • 办公、行业>
  • 幼教>
  • 小学>
  • 初中>
  • 高中>
  • 中职>
  • 大学>
  • 各类题库>
  • ImageVerifierCode 换一换
    首页 163文库 > 资源分类 > ZIP文档下载
    分享到微信 分享到微博 分享到QQ空间

    Unit 3 Family ties (ppt课件)-2024新外研版七年级上册《英语》.zip

    • 资源格式: ZIP        下载积分:2文币     交易提醒:下载本文档,2文币将自动转入上传用户(QXX)的账号。
    微信登录下载
    快捷注册下载 游客一键下载
    账号登录下载
    二维码
    微信扫一扫登录
    下载资源需要2文币
    邮箱/手机:
    温馨提示:
    快捷下载时,用户名和密码都是您填写的邮箱或者手机号,方便查询和重复下载(系统自动生成)。
    如填写123,账号就是123,密码也是123。
    支付方式: 支付宝    微信支付   
    验证码:   换一换

    优惠套餐(点此详情)
     
    账号:
    密码:
    验证码:   换一换
      忘记密码?
        
    友情提示
    2、试题类文档,标题没说有答案的,则无答案。带答案试题资料的主观题可能无答案。PPT文档的音视频可能无法播放。请谨慎下单,否则不予退换。
    3、PDF文件下载后,可能会被浏览器默认打开,此种情况可以点击浏览器菜单,保存网页到桌面,就可以正常下载了。
    4、本站资源下载后的文档和图纸-无水印,预览文档经过压缩,下载后原文更清晰。
    5、本站不支持迅雷下载,请使用电脑自带的IE浏览器,或者搜狗浏览器、谷歌浏览器下载即可。。

    Unit 3 Family ties (ppt课件)-2024新外研版七年级上册《英语》.zip

    1、七上英语七上英语 WY WYUnit 3 Family tiesUnderstanding ideasLanguage points1 Silent love 无声的爱(教材无声的爱(教材P48)silent/salnt/adj.不作声的不作声的 remain/stay/keep silent保持沉默 Hearing her words,we all kept(动词keep的过去式)silent.听了她的话,我们所有人都沉默了。Language points (1)silent的其他常见含义:Language points(2)silent的相关词:He sat silently by the

    2、 bed.他默不作声地坐在床边。They finished the meal in silence.他们默不作声地吃完了饭。Language points【考向点拨考向点拨】silent的常考方向的常考方向考查语境中silent的词形转换;考查语境中silent及其同根词的含义;考查与silent及其同根词相关的固定短语。Language points典例 用所给单词的适当形式填空。大连中考 Now more and more people like the _ in the countryside(乡村).(silent)silence解析解析 句意:现在越来越多的人喜欢乡村的宁静。like

    3、为动词,且空前有定冠词the,故空处应用名词,填silence。Language points典例 福建中考 Photos are _,but they say a lot about our lives.CA.specialB.strangeC.silent解析解析 由空后的“but they say a lot about our lives”(但它们却道出了我们生活中的很多事情)可知,此处表示“照片是无声的”。special“特殊的”;strange“奇怪的”;silent“寂静的,无声的”。故选C。Language points2 Along a mountain road,a han

    4、dsome young man walks fast.在一条山路上在一条山路上,一个英俊的年轻人快步走着一个英俊的年轻人快步走着。(教材教材P48)along/l/prep.顺着;沿着顺着;沿着go/walk along沿着走run along沿着跑 They are also planting trees along streets in order to help clean the air.为了帮助净化空气,他们还沿着街道植树。Go along Center Street and turn left at the second crossing.沿着中心街走,在第二个十字路口向左拐。La

    5、nguage points 副词向前;(与某人)一起 I walked along singing songs.我唱着歌向前走去。Come to the party and bring some friends along please.请带一些朋友一起来参加聚会吧。Language points典例 吉林中考 Excuse me.Where is the nearest bookstore?Go _ Center Street and youll find it.BA.forB.alongC.with解析解析 答句句意:沿着中心街走,你就能找到它。go along“沿着走”符合语境。故选B。

    6、Language points mountain/mantn/n.高山,山岳高山,山岳 指比较高大的山。常用短语:climb a mountain爬山in the mountains 泛指在山区on the mountain特指在某座山上 Mia went to climb the mountain last weekend.米娅上周末去爬山了。They went climbing in the mountains.他们去山区爬山。They lost their way and had to spend a night on the mountain.他们迷路了,只能在山上待一晚。Langua

    7、ge points 名词许多;大量a mountain of/mountains of 许多;大量 We made mountains of sandwiches.我们做了一大堆三明治。Language points3 An older man with a strict face follows him.一位面容一位面容严肃的老人跟在他身后。(教材严肃的老人跟在他身后。(教材P48)strict/strkt/adj.严格的,严厉的严格的,严厉的 形容词可在句中作表语或定语。be strict about sth.对某事要求严格be strict with sb.对某人要求严格Language

    8、 points【语境串记语境串记】Mrs Li is a strict mother.She is strict with her children.Especially she is very strict about things like homework.李太太是一位严格的母亲。她对子女要求严格。尤其是她对作业之类的事要求非常严格。Language points4 Its a touching story about the love between father and son.这是一个关于父子情的感人故事。(教材这是一个关于父子情的感人故事。(教材P48)touching/tt/a

    9、dj.感人的;动人的感人的;动人的Language points What he said really touched my heart.他说的话着实 打动了我的心。That is a touching story and we are all touched.那是个感人的故事,我们都被感动了。Language points between.and.在在和和之间之间 Can you find the differences between these two pictures?你能找出这两张图片之间的区别吗?between介词在之间(1)指时间上“在之间”。You should take t

    10、he medicine between meals.你应该在两餐之间服药。(2)指空间上“在之间”。I sat down between Jo and Jane.我在乔和简中间坐下。Language points5 For years,the father served as the postman for this area.多年来,父亲一直担任这个地区的邮递员。(教材多年来,父亲一直担任这个地区的邮递员。(教材P48)serve/s:v/v.为为工作;供职工作;供职 动词可作及物动词和不及物动词。He served as the clubs adviser.他担任过该俱乐部的顾问。He s

    11、erved in the company for five years.他在这家公司 供职了五年。We feel proud to serve the country.能为国效力我们感到 很骄傲。Language pointsserve动词端上(饭菜等);接待service名词服务 The waiter was serving another table.那名服务员在接待另一桌客人。The service was terrible and so was the food.服务很差,饭菜也差。Language points serve as 担任,充当,起担任,充当,起作用作用 My uncle

    12、 serves as the principal of this school.我叔叔担任这所学校的校长。The sofa can serve as a bed for a night.沙发可以当床凑合一夜。Art serves as a bridge between different nations.艺术充当不同国家之间的桥梁。Yes.It really helps cross-cultural communication.是的。它确实有助于跨文化交流。(安徽中考)Language points area/eri/n.(国家、市镇等的)地区,区域(国家、市镇等的)地区,区域 Some ar

    13、eas in the world are short of water a lot.世界上有些地区严重缺水。area的其他含义:(1)领域,方面 The course covers three main subject areas.这门课程涵盖三个主要学科领域。(2)面积 The Yangtze River basin covers an area of about 1.8 million square kilometers.长江流域面积约为180万平方千米。Language points6 He was often absent from home and the son seldom sa

    14、w him.他经常不在家,儿子也很少见到他。(教材他经常不在家,儿子也很少见到他。(教材P48)absent/bsnt/adj.不在的,缺席的不在的,缺席的 be absent from.缺席 Tom was absent from classes yesterday because he caught a cold.汤姆昨天没来上课,因为他感冒了。(日照中考)absence名词缺席;不在 Will you please take care of my dog during my absence?我不在时,请你帮我照顾一下我的狗好吗?Language points seldom/seldm/a

    15、dv.很少,罕见,不常很少,罕见,不常 seldom一般位于be动词或助动词之后,行为动词之前。She is seldom at home on Sunday.她星期天很少在家。They seldom watch television these days.这些日子他们 很少看电视。Language points典例 葫芦岛中考 In order to protect his eyes,he _ uses electronic products.DA.alwaysB.oftenC.usuallyD.seldom解析解析 句意:为了保护眼睛,他很少使用电子产品。由前面的“In order to

    16、protect his eyes”可知,他很少使用电子产品。always“总是”;often“经常”;usually“通常”;seldom“很少”。故选D。Language points7 Along the way,they start to see into each others hearts.在这个过程中,他们开始理解彼此的内心。(教材在这个过程中,他们开始理解彼此的内心。(教材P48)along the way在这一过程(经历)中;在这一过程(经历)中;在生活道路上在生活道路上 She saw many beautiful flowers along the way.她沿途看到 了许

    17、多美丽的花。We all meet some happiness and unhappiness along the way.在生活的道路上,我们都会遇到一些快乐和不快乐。Language points each/i:t/pron.(两个或两个以上物或人中的)(两个或两个以上物或人中的)每个,各每个,各 可单独作主语,也可接介词of;“each of+复数名词/代词”作主语时,谓语动词用单数形式。There are five boys in this group and each has his own answer.这个小组有五个男孩,每个人都有自己的答案。Each of us likes

    18、English.我们每个人都喜欢英语。可用作复数名词或代词的同位语。作主语的同位语时,谓语动词应用复数形式。We each have different problems.我们各自有不同的问题。Language points 限定词每个;各个 用于名词前作定语,修饰可数名词单数。Each school has its own library.每所学校都有自己的 图书馆。Language points each other 互相;彼此互相;彼此 可作动词或介词的宾语。所有格形式为each others。My classmates and I get on well with each other

    19、 and we love the big family.我和我的同学相处得很好,我们喜欢 这个大家庭。We can wear each others clothes.我们可以相互换着衣服 穿。Language points典例 根据所给汉语提示完成句子。云南中考 Knowing _ is the first step to make friends.(互相)each otherLanguage points8 For the first time,the son carries his father across a cold river.第一次,儿子背着父亲蹚过冰冷的河流。第一次,儿子背着父

    20、亲蹚过冰冷的河流。(教材(教材P49)for the first time 首次,初次首次,初次 Chinese people often shake hands when they meet for the first time.中国人第一次见面时经常握手。含time的其他常见短语:at the same time同时all the time一直from time to time不时;有时at times有时,间或Language points carry/kri/v.把(某物或某人)带至把(某物或某人)带至 (新的地点或位置)(新的地点或位置)carry,take,bring与getcar

    21、ry拿;提;扛表示搬运、携带,具有负重的含义。没有方向性。take拿走;带走指把人或物从说话者所在的地方带到别处。有方向性。bring拿来;带来指把人或物从别的地方带到说话者所在的地方。有方向性。get去取;去拿指到某地去把某人或某物带来或拿来。表示来回。Language points Can you help me carry the box?你能帮我搬这个箱子吗?Youd better take her to hospital.你最好带她去医院。Bring your raincoat here.把你的雨衣带到这儿来。Please get me my glasses.请去把我的眼镜拿来。La

    22、nguage points across/krs/prep.横跨,跨越横跨,跨越 across,through与over across指从事物表面的一边到另一边,如过河、过马路等。through指从事物的内部穿过,如穿过洞穴、隧道、森林等。over指翻过一个高的障碍物(如树、墙、篱笆和山脉等)到另一侧的动作。Language points【语境串记语境串记】If you want to climb over the mountain,youll have to swim across the river first,and then walk through the forest.如果你想翻过

    23、那座山,你得先游过这条河,接着穿过那片森林。Language points典例 连云港中考 The traffic light is green.Lets go _ the road.CA.againstB.amongC.acrossD.above解析解析 against“反对,违背”;among“在之中”;across“穿过,横过”;above“在上方”。根据前句句意“交通灯是绿灯”可知,此处是说“我们过马路吧”。故选C。Language points9 It brings back the fathers memory of carrying the son on his back.这让父

    24、亲想起了以前背着儿子的情景。这让父亲想起了以前背着儿子的情景。(教材(教材P49)bring back使想起,使回忆起使想起,使回忆起 The photos brought(bring的过去式)back many pleasant memories.那些照片使人想起很多美好的回忆。Language points (1)bring back还可意为“带回;归还”I brought a T-shirt back for Mark.我为马克带回来一件 T 恤衫。Please bring back all library books by the end of the week.请在周末前把图书馆的书

    25、全部归还。(2)bring的相关短语bring out 使显现,使表现出bring out the best in sb.把某人最好的一面展现出来bring up 抚育;养育Language points memory/memri/n.记忆,回忆记忆,回忆 复数形式为memories。bring back.memories唤起回忆 What is your earliest memory?你最早能记得的是什么?The letters bring back lots of good memories.这些信件唤 起了许多美好的回忆。Language points (1)memory名词记忆力 H

    26、ere is some advice to help improve your memory.这里有一些能帮助提高你记忆力的建议。(黄冈中考)(2)memorize动词记忆,记住 My Chinese teacher asked me to memorize the poem.我的语文老师要我记住这首诗。Language points10 Tears quietly run down his face.泪水从他的脸上悄然泪水从他的脸上悄然流下。(教材流下。(教材P49)tear/t/n.眼泪;泪水眼泪;泪水 可数名词 通常用复数形式。in tears 哭着burst into tears 突然

    27、大哭be close to tears 快要哭出来 She left the room in tears.她哭着离开了房间。He suddenly burst into tears.他突然放声大哭起来。I could see that Sam was close to tears.我看到萨姆都快哭了。Language points run down 往下流往下流 Tears started to run down her cheeks.眼泪开始顺着她的 脸颊淌下来。run down还可意为“耗尽能量;停止工作”The battery ran down this evening.电池今天晚上没电

    28、了。The clock has run down.钟停了。Language points11 He is happy about his sons growth.他为儿子的成长他为儿子的成长感到高兴。(教材感到高兴。(教材P49)growth/gr/n.(性格、智力或情(性格、智力或情感的感的)发展,成长发展,成长 不可数名词 A loving home is important to a childs growth.和睦的家庭对孩子的成长很重要。Lack of water will stunt the plants growth.缺水会妨碍植物生长。Language points12 But

    29、 he just hides his care in his heart.但他只是把关怀但他只是把关怀藏在心里。(教材藏在心里。(教材P49)care/ke/n.担心;忧虑担心;忧虑 It seems that Sam doesnt have a care in the world.看起来萨姆似乎无忧无虑。Frank is a man with the cares of the world on his shoulders.弗兰克是一个满腹心事的人。Language points (1)care作名词时的常用短语:in the care of sb./in sb.s care 由某人照管tak

    30、e care of 照顾,照料;处理,负责take care(告别用语)保重;小心(2)care作动词时的常用短语:care about 关心;在乎 care for 非常喜欢;照顾Language points(3)care的相关词:Language points13 Choose three words to describe the father and the son each,and give your reasons.请分别选择三个词来形容请分别选择三个词来形容父亲和儿子,并说明理由。(教材父亲和儿子,并说明理由。(教材P50)reason/ri:zn/n.原因,理由原因,理由 常

    31、见搭配有:the reason why.的原因for some/this reason出于某种/这个原因have no reason for doing sth.没有理由做某事Language points Do you know the reason why she was late this morning?你知道她今天早上迟到的原因吗?Tell him or her that you cant be there for some reason.告诉他/她由于某种原因你不能去那儿。We have no reason for not finishing the homework.我们没有理由

    32、不完成家庭作业。reasonable形容词合理的;合乎情理的 Give me a reasonable excuse.给我一个合理的借口。Language points典例 根据所给首字母提示填写单词。自贡中考 Could you tell me the r_ why you can remember so many words in a short time?eason解析解析 句意:你能告诉我你可以在短时间内记住这么多单词的原因吗?the reason why.为固定用法,故填reason。Language points14 married 已婚(教材已婚(教材P51)marry(过去式为

    33、married)/mri/v.结婚;娶;嫁结婚;娶;嫁 (1)不及物动词结婚 其名词形式为marriage(婚姻)。Jack and Lucy married in England but lived in China.杰克和露西在英国结的婚,但是住在中国。(2)及物动词(和某人)结婚;嫁;娶 His parents did not want them to marry each other.他的父母不希望他们结婚。Language points【特别提醒特别提醒】marry是短暂性动词,不能与表示时间段的状语连用。我们结婚两年了。()We married for two years.()We

    34、 married two years ago.Language points Mr Brown is a married man.布朗先生是一位已婚男士。My cousin Lisa is going to get married to John on New Years Day.我的表姐莉萨将在元旦那天与约翰结婚。They have a happy marriage.他们婚姻美满。Language points15 Dad is abroad,building a high-speed railway.爸爸爸爸正在国外修建高铁。(教材正在国外修建高铁。(教材P51)abroad/br:d/a

    35、dv.在国外;到国外在国外;到国外 不能与in、to、at等介词连用,其前通常也不加冠词,但可与介词from连用。go/live/travel abroad 出国/住在国外/到国外旅行at home and abroad 在国内外 She has lived abroad for a year.她已经在国外住了一年了。Mount Changbai is a famous mountain at home and abroad.长白山是国内外的名山。(吉林中考)Language points aboard为abroad的形近词,可作副词和介词,意为“在(船、飞机、火车等)上;上(船、飞机、火车等

    36、)”。go aboard“上(船/车);登(机)”。【语境串记语境串记】His mother often goes abroad on business.She is going aboard the plane to Russia now.他的妈妈经常去国外出差。现在她正在登机去俄罗斯。Language points16 And we kept our family tradition alive with the help of social media.在社交媒体的帮助下,我们保持了我们的在社交媒体的帮助下,我们保持了我们的家庭传统。(教材家庭传统。(教材P51)alive/lav/ad

    37、j.仍然存在的仍然存在的 通常在句中作表语或宾语补足语。The old tradition is still alive.这个古老的传承至今仍然 存在。(作表语)We need to keep hope alive.我们心中应抱有希望。(作宾语补足语)Language points alive的其他常见用法:(1)活着;在世 My grandparents are still alive.我的祖父母都还健在。(2)激动兴奋;有活力 Han Lin was alive with happiness.韩林高兴得眉飞色舞。Her eyes were alive with interest.她的眼睛充

    38、满了兴趣。Language points keep sb./sth.+adj.使某人使某人/某物保持某种状态某物保持某种状态 I want to keep my mother happy.我想让我妈妈幸福。Please keep your room tidy.请保持你的房间整洁。谢谢聆听!THANKS七上英语七上英语 WY WYUnit 3 Family tiesDeveloping ideasLanguage points1 Harmony in a family makes everything successful.家和万事兴。(教材家和万事兴。(教材P53)harmony/hmni/n

    39、.融洽相处融洽相处 不可数名词in harmony with sb.与某人相处融洽 She lives in harmony with her neighbors.她和邻里相处融洽。be in harmony with sth.和某事物一致;和某事物协调 Your suggestions are not in harmony with our aims.你的建议与我们的目标不符。Language points2 Who can you turn to in order to solve problems in your family?为了解决问题,你可以向家庭中哪个成员求助?为了解决问题,你可

    40、以向家庭中哪个成员求助?(教材(教材P53)通常与problem连用。Remember we should try our best to solve all the problems by ourselves.记住我们应该尽最大努力自己解决所有的 问题。solve/slv/v.解决(问题)解决(问题)Language points solution名词解决方法 a/the solution to.的解决方法 Brainstorming is the practice of coming up with ideas or solutions.头脑风暴是想出主意或解决方法的练习。Theres n

    41、o simple solution to this problem.这个问题没有 简单的解决办法。Language points3 Many countries offer family hotlines to give advice about family relationships.许多国家都提供家庭热线,许多国家都提供家庭热线,为家庭关系提供建议。(教材为家庭关系提供建议。(教材P53)relationship/rlenp/n.(人或团体之间的人或团体之间的)关关系系 由“relation(n.关系)+-ship(名词后缀)”构成。She has a close relationshi

    42、p with(与关系亲密)her sister.她和她妹妹关系非常亲密。Honesty is the first step to build a good relationship between parents and children.诚实是建立良好亲子关系的第一步。Language points4 She dressed up as a queen.她把自己装扮成一个女王。她把自己装扮成一个女王。(教材(教材P54)dress up 装扮装扮 dress up as/like(后接表示角色或职业等的名词)装扮成 He dresses up as/like a doctor in this

    43、 play.在这部剧中,他扮成一名医生。dress up还可表示“穿上盛装”。We all dressed up for dinner.我们都穿上盛装赴宴。Language points5 Her mother often goes to pick her up in this dress.她妈妈经常穿着这件衣服去接她。(教材她妈妈经常穿着这件衣服去接她。(教材P54)pick up 搭载;(开车)接人搭载;(开车)接人 是“动词+副词”型短语,其后接名词作宾语时,名词 放在pick与up之间或up之后均可;若接代词作宾语,代词只能放在pick与up之间。Shall we go to the

    44、airport to pick up your sister(=pick your sister up)?我们去机场接你妹妹好吗?Your sister is coming.Lets go to pick her up.你姐姐就要 来了,咱们去接她吧。Language points pick up的其他常见含义:捡起;拿起Helen picked up a magazine and began to read.海伦拿起一本杂志,开始看起来。学会Last week,I picked up a popular recipe to cook fish.上周,我学会了一个流行的烹饪鱼的食谱。收拾;整理

    45、Will you pick up all your toys?把你的玩具都收起来好吗?接电话I called you at seven and you didnt pick up.我7点给你打电话,你没有接。Language points6 John and Robert Taylor finished the school bike race.约翰约翰泰勒和罗伯特泰勒和罗伯特泰勒完成了学校的自行车比赛。泰勒完成了学校的自行车比赛。(教材(教材P56)finish/fn/v.完成,做完完成,做完 (1)不及物动词结束 The meeting finishes at 5:00 p.m.会议在下午

    46、5点结束。Language points(2)不及物动词&及物动词完成;做好finish doing sth.做完某事 My brother doesnt finish on time.我哥哥没有按时完成。(不及物动词)She finishes reading this magazine.她读完了这本杂志。(及物动词)Language points典例 用所给单词的适当形式填空。Zhang Peng helped his mother cook the dinner after he finished _(do)the homework.doing解析解析 句意:做完家庭作业后,张鹏帮妈妈做晚

    47、饭。finish doing sth.“做完某事”为固定用法。故填doing。Language points7 They are always close to each other.他们一直亲密无间。他们一直亲密无间。(教材(教材P56)be close to sb.和某人亲近和某人亲近 此处close作形容词,意为“亲密的;亲近的”。My brother and I are very close.我和弟弟很亲。Were a very close family.我们是亲密无间的一家人。She is very close to her father.她和父亲的关系很亲密。Language po

    48、ints close的其他常见含义:【语境串记语境串记】Tony lives close to Sam.The new supermarket is close to their houses and it usually closes on Tuesday.托尼住得离萨姆很近。新开的超市离他们的家很近,但它通常在周二不营业。Language points8 But Robert has a serious disease and cannot move at all.但是罗伯特得了一种很严重的病但是罗伯特得了一种很严重的病,完全不能动。完全不能动。(教材教材P56)serious/sris/

    49、adj.严重的严重的 There was a serious car accident yesterday morning.昨天早上有一起严重的车祸。The problem is serious.问题很严重。Language points serious的其他常见含义:(1)严肃的,认真的 be serious about sb./(doing)sth.对某人/(做)某事是认真的 We should be serious about this problem.我们应该严肃 对待这个问题。Is she serious about giving up her job?她辞职是认真的吗?You ca

    50、nt be serious!你一定是在开玩笑吧!Language points(2)很感兴趣的;热衷的 She is a serious cyclist.她热衷于骑自行车。(作定语)When it comes to fishing,he is very serious.一提起钓鱼,他就来劲。(作表语)Language points not(.)at all根本不;一点也不根本不;一点也不 表示强烈的否定。not常位于连系动词be、助动词或情态动词之后,at all通常位于句尾。We dont know each other at all,but the bright smiles bring


    注意事项

    本文(Unit 3 Family ties (ppt课件)-2024新外研版七年级上册《英语》.zip)为本站会员(QXX)主动上传,其收益全归该用户,163文库仅提供信息存储空间,仅对用户上传内容的表现方式做保护处理,对上传内容本身不做任何修改或编辑。 若此文所含内容侵犯了您的版权或隐私,请立即通知163文库(点击联系客服),我们立即给予删除!




    Copyright@ 2017-2037 Www.163WenKu.Com  网站版权所有  |  资源地图   
    IPC备案号:蜀ICP备2021032737号  | 川公网安备 51099002000191号


    侵权投诉QQ:3464097650  资料上传QQ:3464097650
       


    【声明】本站为“文档C2C交易模式”,即用户上传的文档直接卖给(下载)用户,本站只是网络空间服务平台,本站所有原创文档下载所得归上传人所有,如您发现上传作品侵犯了您的版权,请立刻联系我们并提供证据,我们将在3个工作日内予以改正。

    163文库