Unit3补全短文（六选五）10篇单元练习2026-2027学年人教版英语八年级上册

**基本信息** 人教版英语八年级上册Unit3补全短文（六选五）专项练习，含10篇语篇，围绕友谊、性格差异等主题，适配单元复习，提升语篇理解与逻辑衔接能力。 **题型特征** |题型|题量/分值|知识覆盖|命题特色| |----|-----------|----------|----------| |补全短文（六选五）|10篇（50空）|涵盖友谊要素（真诚、分享）、朋友异同、性格差异、考拉科普等主题，涉及说明文、书信体裁|情境贴近学生生活（如朋友描述、书信交流），问题设计梯度分明（基础信息匹配到逻辑推理），注重语言能力（语篇衔接）与思维品质（分析推断）的培养|

2026-2027学年人教版英语八年级上册 Unit3补全短文（六选五）10篇单元练习 序号 文章主要内容 1 本文是一篇说明文，告诉我们想要拥有长久的友谊，需要做到真诚、学会分享、懂得换位思考理解朋友。 2 本文是Mary写给Alice的一封信，介绍了自己最好的朋友Tara，包括Tara的外貌与性格、两人一起学习运动的经历，以及互相留宿、分享秘密的快乐时光。 3 本文作者介绍自己两位性格不同的好朋友Lily和Lucy，表达自己对真正友谊的看法：朋友的异同不重要，善良、给予支持才最重要。 4 本文主要介绍了“搭子”友谊的含义，对比了搭子友谊与真正友谊的区别，同时阐述了对待友谊应有的正确态度。 5 本文是一篇说明文，主要讲述了朋友之间的相似与不同、相处与离别以及新旧朋友的关系，旨在帮助读者更好地理解朋友。 6 本文围绕友谊中的相同点与不同点展开，阐述共同点拉近彼此距离，差异促使双方成长，同时说明我们应当尊重朋友之间的分歧。 7 本文主要讲了针对朋友之间存在的相同点与不同点，给出了四条实用的处理建议。 8 本文主要讲述每个人都是独一无二的，分析性格差异来源于家庭环境与爱好，同时说明性格可以改变，我们应当尊重人与人之间的不同。 9 本文主题为“朋友应该相同还是不同”，先介绍人们四种不同的交友观点，再分别引用Ella、Linda、Matt、Liu Yu四位同学的亲身经历阐述各自看法。 10 本文介绍了考拉的外形特征、生活习性、繁殖特点等相关知识。 （一） Too many people want others to be their friends. But they don’t give friendship back. That is why some friendships don’t last very long. 1 You must learn to treat (对待) your friend the way you want your friend to treat you. Learning to be a good friend means learning three rules: Be true; Be generous (慷慨的); Be understanding. Being true is where a good friendship starts. 2 If you don’t tell the truth, people usually find out. Then you may lose your friend’s trust. Generosity means sharing. You don’t have to give your lunch money or your clothes. But you have to learn how to share things you like, such as your hobbies and interests. 3 These can be meaningful to a friend. They tell your friend what is important to you. Then your friend can know you better. Everyone needs help with a problem. Talking about the problem can make it easier to solve. 4 You must try to put yourself in your friend’s place so you can understand the problem better. 5 But all true friendships have three things in common. If you plan to keep your friendships, you must practice being true, generous and understanding. A．So you must listen and understand. B．Good friends need to trust each other. C．To have a friend, you must learn to be one. D．No two friendships are ever exactly similar. E．You will also want to share your ideas and feelings. F．True friends usually know you better than others. （二） Dear Alice, Thank you for your letter. 6 It always makes me happy to hear from you. Thank you for telling me about your best friend — she sounds wonderful! In this letter, I will tell you about mine. Her name is Tara. 7 She is the same age as me, but a little taller. She has the brightest smile and is always happy, even on rainy days. We sit together in class every day, and we help each other with our schoolwork. When I don’t understand something, Tara explains it patiently. 8 Tara is quick and usually wins, but she never shows off. Instead, she teaches me how to improve. Tara is learning to play the piano. 9 We practice together every day after homework. Sometimes we even try to play duets, though they don’t always sound perfect! Sometimes Tara stays in my home for a night, or I stay in hers. 10 We talk for hours, watch movies, and share secrets. Do you ever stay in your best friend’s home for a night? Write soon — I miss you! Best Wishes, Mary. A．I am learning to play the violin. B．I am very glad to know everything goes well with you. C．We always have a great time. D．Tara has long dark brown hair and green eyes. E．We will go shopping to buy some drinks and food. F．After school, we always go home together and play ping-pong. （三） I have two amazing friends, Lily and Lucy. They are both very special to me. Lily is funnier than anyone else I know. When I feel sad or have a problem, 11 She helps me see the silver lining in difficult situations. 12 She is quieter, but she listens better than others. Lucy and I talk about everything. I know she cares about me because she’s always there to listen. My favourite saying is, “A true friend reaches for your hand and touches your heart.” 13 We are always ready to help each other by lending a hand. I think both similarities and differences are important in a friendship. 14 I don’t really care if my friends are similar to or different from me. What matters is that they are kind and supportive. 15 A．Lucy is not as funny as Lily. B．Real friendship is built on trust. C．They help me become a better person. D．They enjoy taking part in all kinds of parties. E．She makes me laugh and feel better. F．Both of them are true friends. （四） Do you hear of the “Da Zi” friendship? 16 Although “Da Zi” friends are not close, they share the same hobbies. When you want to eat or play sports with someone, but not want to share all your information with him or her, “Da Zi” can be the best for you. Good friends can make you happy when you’re sad. They can help you when you face difficulties. 17 “Da Zi” is not a true friendship. Friendship needs more time to keep. 18 Some will stay with you for a long time. But others may leave after a short time. 19 Just try to enjoy the friendship as long as you can. If you’re really sad about lost friends, you can try to talk to them and ask them about it. If someone does not want to be your friend anymore, that is just his or her choice. Also, it might be better to just have a few close friends. 20 A．What should we do then? B．“Da Zi” means an easy friendship. C．You two always care about each other. D．They can also become worse than before. E．However, “Da Zi” is hard to keep for long. F．You don’t have to be friends with everyone. （五） Friends can do things together. A friend can play with you and laugh with you. 21 A friend can teach you new things. Friends are important to everyone. Here are some ideas to help you better understand friends. Being the same Friends are the same in some ways. 22 For example, Mary and Bill both like to draw. That is how they are the same. Being Different 23 Friends may look different or have different ideas. Ryan is tall, but Lee is shorter. That is how they are different. Staying and Leaving Sometimes friends get to stay together. They may live on the same street or go to the same school. 24 They may move away or go to a different school. Old and New Some friends are old friends. You may have known an old friend for a long time. 25 One way to make friends is to join a club to meet new people. A．You can make new friends too. B．Being a good friend is not easy. C．A friend can help you solve a problem. D．Friends are also different in many ways. E．They may look the same or like the same hobbies. F．But sometimes friends have to say goodbye. （六） Similarities and differences make our friendship colorful. 26 First, similar interests bring us close. If you and your friend both love movies, you can watch films together and share your feelings. 27 You will have a lot of fun time together. Second, differences help us grow. 28 If your friend is good at planning trips, he can help you organize your weekend activities. You can teach him to do better in English. 29 Too many disagreements will hurt the friendship. We need to respect each other’s choices and ideas. All in all, similarities build friendship and differences improve it. 30 A．However, we should accept differences politely. B．Here are two reasons for this idea. C．You can talk about the stories and actors after watching. D．Good friends learn skills from one another. E．We can enjoy both sameness and differences in friendship. F．It is impossible for two people to share all the same ideas. （七） It’s common for middle school students to discuss similarities and differences between friends. Lots of students don’t know how to treat these differences in the right way. 31 First, accept the value of similarities. When you and your friends share the same hobbies, you will have lots of topics to communicate about. 32 For example, two quiet book lovers can spend whole afternoons talking about novels without feeling bored. Second, never fear the differences between you and your partners. 33 A more outgoing friend can pull you out of your quiet world; a hard-working deskmate can push you to spend more time on weak subjects. Every different strength can make up for your own shortcomings. Third, compare yourself with others in a proper way. Don’t feel upset just because someone is better at one subject than you. 34 You can learn their useful study methods instead of feeling jealous. Finally, keep in mind that true friendship never depends on being exactly the same. 35 The most important thing is to respect each other’s special points and grow together side by side. A．Similar interests make it easy to get along well with others. B．Instead, take differences as chances to improve yourself. C．Here are four useful suggestions for you to deal with this problem. D．It doesn’t matter whether your friend is similar or totally different. E．You should stay away from people who are different from you. F．Nobody is perfect, and everyone has their own strong points. （八） Everyone is special. No two people in the world are exactly the same. 36 Some are quiet and shy, while others are active and outgoing. Some people are hard-working, but a few are a little lazy. Why do people have different personal traits? 37 Family environment shapes us a lot. Kids growing in active families often become outgoing. 38 Besides environment, hobbies also change our personalities. 39 If you love reading, you may become calm and careful. If you like sports, you may become brave and energetic. However, personalities are not fixed. 40 A shy person can practice speaking and become confident. A lazy student can make plans and become hard-working. The most important lesson is that we should respect differences. Differences make our world rich and colorful. A．We can change ourselves. B．People have different personalities. C．It mainly depends on our living environment. D．Different hobbies bring different changes. E．Quiet families usually raise quiet children. F．Everyone has the same lifestyle. （九） Same or Different? Should friends be different or the same? Different people have different ideas. Some people like to have friends who have hobbies in common. Some like to have friends who are different from them. Some like to have friends who are similar to them. Some don’t care if friends are the same as them or different. 41 My name is Ella. I am outgoing. 42 Both my best friend Helen and I like travelling. We went to Italy with our family last summer holiday. We stayed there for two weeks. Next year we want to go to Paris. My name is Linda. I like to have friends who are different from me. 43 I am quiet and I like reading very much. Susan likes sports and she plays table tennis well. I’m Matt. I like to have friends who are like me. It can be very helpful. I’m a little quiet and my good friend Tom is quiet, too. 44 That’s because he knows about me better than people who are different from me. We all like watching the Beijing Opera. I’m Liu Yu. 45 I think this makes my life more colorful. My friend Xiao Peng is very similar to me—he loves sports as much as I do. On the other hand, my friend Chen Jun is totally different from me. I’m a bit lazy sometimes, but Chen Jun is very hard-working and organized. He often helps me study and encourages me to finish my tasks on time. A．I have both kinds of friends. B．I like to have friends who are similar to me. C．The following is what four of my classmates say. D．I only make friends who share the same hobby as me. E．When I’m in trouble, he always knows how to help me. F．My best friend Susan is shorter and more outgoing than me. （十） Koalas are often called Koala bears, but they are not bears. They have small eyes, a big nose and round ears. And they have no tails. They can run as fast as rabbits. 46 Koalas live in eucalyptus trees (桉树) and feed on the tree leaves. They usually sleep about 20 hours a day. The word “koala” comes from an Australian word. It means “no drink”. Koalas don’t drink much water. 47 Much like kangaroos (袋鼠)，koalas have pouches (育儿袋) for carrying their young. A koala mother usually gives birth to one joey (幼兽) at a time. 48 It has no hair, no ears, and is blind. As soon as it’s born, it finds its way to its mother’s pouch, and stays there for about 6 months. That’s about how long it takes for the joey to see, grow ears and hair, and walk on its own. By about 7 months of age, the joey gets into the pouch less, and spends more time on its mother’s back. At about 12 months, it leaves its mother to build its own home. 49 50 Their numbers are dropping every year. To save koalas, a group called Bangalow Koalas was set up in 2016. For years, it has planted over 400,000 trees. The group hopes to plant 500,000 trees by 2025. “I can’t imagine a world with no koalas at all. We’re going to do everything we can to make sure that doesn’t happen.” said Ms Sparrow, a worker from the group. A．A koala usually can live up to 15 years. B．They are also good at climbing trees. C．Now koalas are in great danger. D．Koalas are very friendly to humans and are often seen in zoos. E．They get water from what they eat. F．The joey is only 2 cm long. 参考答案 1．C 2．B 3．E 4．A 5．D 【导语】本文是一篇说明文，告诉我们想要拥有长久的友谊，需要做到真诚、学会分享、懂得换位思考理解朋友。 【详解】1．上文提到很多人想要朋友却不付出友谊，下文说“You must learn to treat your friend the way you want your friend to treat you. ”，点明了要以希望朋友对待自己的方式去对待朋友，C项“To have a friend, you must learn to be one.”承上启下，符合语境。 2．本段主题是诚实，后文提到“If you don’t tell the truth,”和“Then you may lose your friend’s trust.”说明，如果不诚实会失去信任，B项“Good friends need to trust each other.”与前后文关于真诚和信任的内容紧密相关。 3．本段讲述慷慨意味着分享，根据前文提到“you have to learn how to share things you like, such as your hobbies and interests”可知，交朋友需要学会分享爱好和兴趣，E项“You will also want to share your ideas and feelings.”是对分享内容的补充，且对应后文的“These”。 4．本段讨论帮助朋友解决问题，和后文“try to put yourself in your friend’s place”，强调了换位思考可以更好地理解问题，A项“So you must listen and understand.”是解决问题的合理建议，符合逻辑。 5．后文用But转折指出所有真正的友谊都有三个共同点，因此空白处应指出友谊的不同之处，D项“No two friendships are ever exactly similar.”与后文构成转折关系。 6．B 7．D 8．F 9．A 10．C 【导语】本文是Mary写给Alice的一封信，介绍了自己最好的朋友Tara，包括Tara的外貌与性格、两人一起学习运动的经历，以及互相留宿、分享秘密的快乐时光。 【详解】6．根据“Thank you for your letter.”及“It always makes me happy to hear from you.”可知，Mary收到Alice的来信很高兴，此处应表达得知对方一切顺利的喜悦心情，自然引出下文。 7．根据“Her name is Tara.”及下文“She is the same age as me, but a little taller. She has the brightest smile…”可知，此处是介绍Tara的外貌特征，与下文的内容衔接。 8．根据“Tara is quick and usually wins, but she never shows off. Instead, she teaches me how to improve.”可知，此处提到了一项Tara擅长且经常获胜的活动，与“play ping-pong”对应。 9．根据“Tara is learning to play the piano.”及下文“We practice together every day after homework. Sometimes we even try to play duets”可知，此处说明Mary也在学习一种乐器，才能与Tara一起练习并尝试合奏。 10．根据“Sometimes Tara stays in my home for a night, or I stay in hers.”及下文“We talk for hours, watch movies, and share secrets.”可知，此处总结两人共度时光的感受。 11．E 12．A 13．F 14．B 15．C 【导语】本文作者介绍自己两位性格不同的好朋友Lily和Lucy，表达自己对真正友谊的看法：朋友的异同不重要，善良、给予支持才最重要。 【详解】11． 根据前文“When I feel sad or have a problem”及后文“She helps me see the silver lining”，可知此处应填朋友如何让作者感觉好转，E项“她让我笑并感觉更好”符合语境。 12．上文介绍完性格风趣的Lily，此处转到Lucy，A项“Lucy不如Lily有趣”符合语境，后接“She is quieter”，前后紧密呼应。 13．前文引用了关于真朋友的名言，后文提到互相帮助，F项“她们都是真朋友”既呼应了名言，又总结了两人关系，符合逻辑。 14．前文承认异同有意义，后文描述我并不在乎朋友和我相似还是不同，B项递进点明真正的友谊核心是信任， 符合语境。 15．文章结尾处总结友谊的意义，C项“她们帮助我成为更好的人”是对全文主题的升华，适合作为结语。 16．B 17．C 18．E 19．A 20．F 【导语】本文主要介绍了“搭子”友谊的含义，对比了搭子友谊与真正友谊的区别，同时阐述了对待友谊应有的正确态度。 【详解】16．第一段开篇引入“搭子友谊（Da Zi friendship）”，空缺句需对“搭子”做定义解释，选项B“‘Da Zi’ means an easy friendship.”恰好承接前文的提问，解释了搭子友谊的含义，与后文“搭子之间不够亲密、仅共享爱好”的描述也能对应，符合语境。 17．第二段围绕“好朋友”的特质展开，前文提到好朋友会在你难过时让你开心、遇到困难时提供帮助，选项C“You two always care about each other.”进一步补充说明好朋友之间的相处状态，延续了本段对真挚友谊的描述，逻辑连贯。 18．第三段转折指出“搭子友谊并非真正的友谊”，前文提到友谊需要时间维系，后文说明“有些搭子会陪你很久，有些则会很快离开”，选项E“However, ‘Da Zi’ is hard to keep for long.”承上启下，点明搭子友谊难以长久维系的特点，衔接自然。 19．第四段给出了关于友谊的应对建议，比如“尽量享受能拥有的友谊”、“不必强求不想和你做朋友的人”，这些都是对问题的解决办法，选项A“What should we do then?”正好引出下文的具体应对措施，符合段落逻辑。 20．第四段最后建议“最好只拥有少数亲密的朋友”，空缺句需总结该观点，选项F“You don’t have to be friends with everyone.”与“只需少数亲密朋友”的核心意思一致，作为结尾的补充说明，使语意完整，符合语境。 21．C 22．E 23．D 24．F 25．A 【导语】本文是一篇说明文，主要讲述了朋友之间的相似与不同、相处与离别以及新旧朋友的关系，旨在帮助读者更好地理解朋友。 【详解】21．前文表述“A friend can play with you and laugh with you.”，介绍朋友可以陪伴玩耍，后文表述“A friend can teach you new things.”，讲述朋友可以教你新东西，C选项“A friend can help you solve a problem.”继续列举朋友带来的帮助，和前后句构成并列关系。 22．本段主题为Being the same，前文表述“Friends are the same in some ways.”，说明朋友在某些方面存在相同之处，E选项“They may look the same or like the same hobbies.”具体阐释朋友的相同之处，引出后文举例说明。 23．本段主题为Being Different，后文表述“Friends may look different or have different ideas.”，介绍朋友之间会存在差异，D选项“Friends are also different in many ways.”作为本段主题句，总领整段内容。 24．前文表述“Sometimes friends get to stay together. They may live on the same street or go to the same school.”，讲述朋友可以相伴在一起，后文表述“They may move away or go to a different school.”，说明朋友会分开，F选项“But sometimes friends have to say goodbye.”用but进行转折，衔接相聚与别离两种情况。 25．前文介绍老朋友，后文表述“One way to make friends is to join a club to meet new people.”，讲述结交新朋友的途径，A选项“You can make new friends too.”起到过渡作用，由老朋友过渡到新朋友。 26．B 27．C 28．D 29．A 30．E 【导语】本文围绕友谊中的相同点与不同点展开，阐述共同点拉近彼此距离，差异促使双方成长，同时说明我们应当尊重朋友之间的分歧。 【详解】26．后文列举两点原因说明异同让友谊多彩，B选项“Here are two reasons for this idea.”起到总起下文的作用。 27．前文提到和朋友都喜欢电影可以一起看并分享感受，C选项“You can talk about the stories and actors after watching.”承接观影这一话题，逻辑连贯。 28．后文举例朋友擅长规划行程可以帮你安排周末，你可以教他提升英语，体现朋友间互相学习技能，D选项“Good friends learn skills from one another.”总领后文内容。 29．后文指出太多分歧会伤害友谊，要尊重彼此的选择想法，和前文说差异助力成长形成转折，A选项“However, we should accept differences politely.”引出对待差异的正确态度，符合逻辑。 30．前文总结相似点建立友谊、差异提升友谊，E选项“We can enjoy both sameness and differences in friendship.”对全文进行收尾升华，契合主旨。 31．C 32．A 33．B 34．F 35．D 【导语】本文主要讲了针对朋友之间存在的相同点与不同点，给出了四条实用的处理建议。 【详解】31．根据前文“Lots of students don’t know how to treat these differences in a right way.”可知很多学生不知道如何正确对待这些差异，后文用First、Second、Third、Finally分点介绍建议。C选项“Here are four useful suggestions for you to deal with this problem.”起到承上启下的作用，引出下文的四条建议。 32．根据本段中心句“First, accept the value of similarities.”可知本段主题为接纳相似之处的价值，A选项“Similar interests make it easy to get along well with others.”说明了共同爱好带来的好处，和后文的例子相呼应。 33．根据本段中心句“Second, never fear the differences between you and your partners.”可知本段主旨是不要害怕彼此之间的差异，后文举例不同的朋友可以互相弥补不足。B选项“Instead, take differences as chances to improve yourself.”提出把差异当作自我提升的机会，贴合本段主旨。 34．根据前文“Don’t feel upset just because someone is better at one subject than you.”不要因为别人某一科比你优秀而沮丧，后文提到可以学习对方的学习方法。F选项“Nobody is perfect, and everyone has their own strong points.”说明没有人是完美的，每个人都有自己的长处，衔接上下文。 35．根据后文“The most important thing is to respect each other’s special points and grow together side by side.”可知真正的友谊不必完全相同，要互相尊重、共同成长。D选项“It doesn’t matter whether your friend is similar or totally different.”点明朋友相似或者不同都不重要，契合段落主旨。 36．B 37．C 38．E 39．D 40．A 【导语】本文主要讲述每个人都是独一无二的，分析性格差异来源于家庭环境与爱好，同时说明性格可以改变，我们应当尊重人与人之间的不同。 【详解】36．前文点明世上没有完全相同的两个人，后文列举安静内向、活泼外向等不同性格表现，B项“People have different personalities.”总起本段，引出下文各类性格差异的举例。 37．前文提出人们性格各不相同的原因是什么，后文重点讲述家庭环境对人的塑造作用，C项“It mainly depends on our living environment.”点明性格差异主要由生活环境决定，回答上文问句。 38．前文说明活跃家庭的孩子大多外向，E项“Quiet families usually raise quiet children.”形成并列对照，阐述安静家庭养育出安静的孩子，一同论证家庭环境影响性格。 39．本段中心为爱好会改变性格，后文分别举例阅读、运动带来的不同性格特质，D项“Different hobbies bring different changes.”总领本段，说明不同爱好带来不同性格改变。 40．前文指出性格并非一成不变，后文举例害羞的人可以变自信、懒惰学生能变勤奋，A项“We can change ourselves.”承接上文，点明我们可以主动改变自身性格。 41．C 42．B 43．F 44．E 45．A 【导语】本文主题为“朋友应该相同还是不同”，先介绍人们四种不同的交友观点，再分别引用Ella、Linda、Matt、Liu Yu四位同学的亲身经历阐述各自看法。 【详解】41．第一段介绍了人们对朋友是否应该相似的不同观点，下文紧接着是四位同学（Ella, Linda, Matt, Liu Yu）的具体陈述。选项C“以下是我的四位同学所说的话。”起到了承上启下的过渡作用，符合语境。 42．根据下文“Both my best friend Helen and I like travelling.”可知，Ella和朋友有共同点。选项B“我喜欢和我相似的朋友。”与下文举例逻辑一致，表达了她的交友偏好。 43．本段主题是Linda喜欢与自己“不同”的朋友。下文提到了“Susan likes sports”，选项F“我最好的朋友Susan比我矮，更外向。”不仅引出了下文的人物Susan，还通过性格对比体现了“不同”，符合段落主旨。 44．空白处后一句是“That’s because he knows about me better...”，这是在解释原因。因此空白处应陈述结果或现象。选项E“当我遇到麻烦时，他总是知道如何帮我。”陈述了朋友带来的帮助，与后文的解释逻辑连贯。 45．本段后文分别提到了相似的朋友（Xiao Peng）和完全不同的朋友（Chen Jun）。选项A“我有两种朋友。”是对下文内容的概括总结，表明作者既交相似的朋友也交不同的朋友。 46．B 47．E 48．F 49．A 50．C 【导语】本文介绍了考拉的外形特征、生活习性、繁殖特点等相关知识。 【详解】46．空前一句提到考拉跑得和兔子一样快（They can run as fast as rabbits），是在描述考拉的运动能力。选项B“They are also good at climbing trees”中的also表示递进，且爬树能力与下文提到考拉生活在桉树上相呼应，符合语境。 47．空前一句提到考拉不怎么喝水（Koalas don't drink much water）。选项E“They get water from what they eat”解释了为什么不喝水也能生存，逻辑紧密相连。 48．空后一句描述刚出生的幼兽没有毛、没有耳朵且看不见（It has no hair, no ears, and is blind）。选项F“The joey is only 2 cm long”是对刚出生幼兽大小的具体描述，与后文对其发育不全的描述相符。 49．本段主要讲述考拉从出生到独立的生活成长过程。空处位于段尾，选项A“A koala usually can live up to 15 years”是对考拉寿命的总结，符合本段介绍生命周期的主题。 50．空后一句提到它们的数量每年都在下降（Their numbers are dropping every year），随后介绍了保护组织的行为。选项C“Now koalas are in great danger”概括了本段主旨，引出下文关于数量减少和保护措施的内容。 学科网（北京）股份有限公司 $