Unit 5 New Technologies in Everyday Life（B卷·单元测试卷）-《英语 拓展模块》（高教版2023版）《同步单元AB卷》

编写说明：本套《同步单元AB卷》紧扣《英语 拓展模块》（高教版2023修订版）教材，以教材单元为基准精准覆盖核心考点，并紧密贴合真题题型。A卷为考点梳理卷，侧重考点分层突破；B卷为单元测试卷，强化综合能力检测，助力师生高效把握教学重点，提升应试能力与知识应用水平。 本卷是 5 New Technologies in Everyday Life的单元测试卷，主要考查词汇、词组、句式句型、情景交际功能话题、阅读能力和书面表达能力。 Unit 5 New Technologies in Everyday Life B卷·单元测试卷 考试时间：60分钟 满分：100分 班级 姓名 学号 成绩 一、单项选择题（共15小题，每小题3分，共45分） 从 A、B、C、D 中，选出可以填入空白处的最佳选项。 1.A smart phone is a useful ______ that can help us do many things in daily life. A. device B. coupon C. alarm D. agenda 【答案】A 【解析】考查名词词义辨析。知识点：名词词义辨析。句意：智能手机是一种有用的设备，能帮我们在日常生活中做很多事。device（设备）符合句意；coupon（优惠券）、alarm（警报）、agenda（议程表）均不符。 2.You need to ______ the app first if you want to use the unmanned supermarket service. A. delete B. install C. scan D. launch 【答案】B 【解析】考查动词词义辨析。知识点：动词词义辨析。句意：若想使用无人超市服务，你需要先安装这个应用程序。install（安装）符合句意；delete（删除）、scan（扫描）、launch（发布）均不符。 3.______ is clear that digital technologies have greatly changed our way of life. A. This B. That C. It D. What 【答案】C 【解析】考查 it 作形式主语。知识点：it 作形式主语，真正主语是 that 从句。句意：很明显，数字技术极大地改变了我们的生活方式。 4.My parents took a ______ to Guilin last summer and they enjoyed the trip a lot. A. package tour B. virtual reality C. QR code D. parcel locker 【答案】A 【解析】考查名词短语辨析。知识点：名词短语辨析。句意：我父母去年夏天去桂林跟团游，玩得很开心。package tour（跟团游）符合句意；virtual reality（虚拟现实）、QR code（二维码）、parcel locker（快递柜）均不符。 5.The question is ______ we can use drones to collect data of the ancient buildings safely. A. that B. whether C. what D. where 【答案】B 【解析】考查表语从句引导词。知识点：表语从句表 “是否” 用 whether。句意：问题是我们能否安全地使用无人机采集古建筑的数据。 6.We can take a ______ tour of the Palace Museum with VR glasses without leaving home. A. military B. commercial C. virtual D. average 【答案】C 【解析】考查形容词词义辨析。知识点：形容词词义辨析。句意：戴上 VR 眼镜，我们不用出门就能进行故宫的虚拟游览。virtual（虚拟的）符合句意；military（军事的）、commercial（商业的）、average（平均的）均不符。 7.______ makes the parcel locker so popular is its 24-hour service and convenience. A. Who B. What C. Which D. When 【答案】B 【解析】考查主语从句引导词。知识点：主语从句缺主语，指代事物用 what。句意：让快递柜如此受欢迎的是其 24 小时服务和便捷性。 8.Please ______ the useless photos in your phone to free up more storage space. A. delete B. connect C. attend D. depend 【答案】A 【解析】考查动词词义辨析。知识点：动词词义辨析。句意：请删除你手机里没用的照片，释放更多存储空间。delete（删除）符合句意；connect（连接）、attend（出席）、depend（依靠）均不符。 9.The company plans to ______ a new type of smart watch next month. A. set up B. carry out C. launch D. base on 【答案】C 【解析】考查动词词义辨析。知识点：动词词义辨析。句意：这家公司计划下个月发布一款新型智能手表。launch（发布）符合句意；set up（建立）、carry out（执行）、base on（基于）均不符。 10.We don't know ______ the digital exhibition of the Great Wall will start. A. that B. where C. when D. what 【答案】C 【解析】考查宾语从句引导词。知识点：宾语从句缺时间状语用 when。句意：我们不知道长城数字展览什么时候开始。 11.The seats in the new subway are more ______ than the old ones. A. spacious B. advanced C. military D. commercial 【答案】A 【解析】考查形容词词义辨析。知识点：形容词词义辨析。句意：新地铁的座位比旧的更宽敞。spacious（宽敞的）符合句意；advanced（先进的）、military（军事的）、commercial（商业的）均不符。 12.It is reported ______ 3D printing technology has been used to restore some cultural relics. A. that B. what C. how D. why 【答案】A 【解析】考查主语从句。知识点：It is reported that... 固定句型，it 作形式主语。句意：据报道，3D 打印技术已被用于修复一些文物。 13.You can ______ your phone to the Wi-Fi in the library to surf the Internet for free. A. scan B. connect C. delete D. launch 【答案】B 【解析】考查动词词义辨析。知识点：动词词义辨析及固定搭配 connect...to...。句意：你可以把手机连接到图书馆的 Wi-Fi，免费上网。 14.The ______ of this new technology is that it leaves the least amount of waste. A. advantage B. agenda C. alarm D. press 【答案】A 【解析】考查名词词义辨析。知识点：名词词义辨析。句意：这项新技术的优势在于它产生的废弃物最少。advantage（优势）符合句意；agenda（议程表）、alarm（警报）、press（媒体）均不符。 15.Every ______ at the tech conference was given a free smart bracelet. A. coupon B. attendee C. package D. drone 【答案】B 【解析】考查名词词义辨析。知识点：名词词义辨析。句意：参加科技会议的每位出席者都得到了一个免费的智能手环。attendee（出席者）符合句意；coupon（优惠券）、package（包裹）、drone（无人机）均不符。 二、完形填空（共 10 小题；每小题 2 分，满分 20 分） 阅读下面短文，从短文后所给各题的四个选项（A、B、C 和 D）中，选出可以填入空白处的最佳选项。 Smart technologies are becoming more and more important in our daily life. Many people now use their phones to 16 QR codes for payment, which makes shopping much easier. Parcel lockers are also widely used in communities. They allow people to pick up their 17 at any time, even when they are not at home. Virtual reality is another amazing technology. With VR glasses, we can have a 18 tour of famous places around the world without traveling. Drones are also playing a big role in many fields. Some are used for taking photos, while others are used for 19 purposes. What 20 us most is that these technologies are also helping protect cultural relics. For example, 3D models can show every detail of ancient buildings. The fact 21 digital technologies can save cultural relics from being damaged is true. We are sure 22 this trend will continue in the future. However, there are still some problems. One of them is 23 we can make these technologies serve more people, especially the elderly. Another problem is how to keep the data safe when using these technologies. No matter what problems we face, it is clear 24 smart technologies are changing the world for the better. It is necessary for us to learn more about them and use them 25 . 16.A. scan B. delete C. install D. launch 17.A. coupons B. packages C. drones D. devices 18.A. military B. commercial C. virtual D. average 19.A. cultural B. educational C. medical D. military 20.A. surprises B. worries C. satisfies D. disappoints 21.A. what B. that C. which D. why 22.A. that B. whether C. what D. how 23.A. that B. how C. what D. where 24.A. that B. what C. which D. who 25.A. widely B. properly C. quickly D. easily 【答案】16.A 17.B 18.C 19.D 20.A 21.B 22.A 23.B 24.A 25.B 【导语】本文介绍智能科技在日常生活中的应用，如扫码支付、快递柜、VR 等，提及科技助力文物保护，也指出相关问题，强调其正让世界变好。 【解析】 16.A。考查动词词义辨析。知识点：动词搭配与语境理解。句意：很多人现在用手机扫描二维码付款，这让购物变得容易得多。scan（扫描）符合 “扫码支付” 的语境；delete（删除）、install（安装）、launch（发布）均不搭配。 17.B。考查名词词义辨析。知识点：名词指代与上下文呼应。句意：快递柜能让人们随时取包裹，即便不在家也可以。packages（包裹）与前文 parcel lockers（快递柜）相呼应；coupons（优惠券）、drones（无人机）、devices（设备）均不符。 18.C。考查形容词词义辨析。知识点：形容词修饰与语境匹配。句意：戴上虚拟现实眼镜，我们不用出门就能环游世界著名景点。virtual（虚拟的）与前文 Virtual reality（虚拟现实）对应；military（军事的）、commercial（商业的）、average（平均的）均不符。 19.D。考查形容词词义辨析。知识点：形容词搭配与常识积累。句意：无人机用途广泛，有的用于拍照，有的用于军事用途。military purposes（军事用途）是无人机的常见应用场景；cultural（文化的）、educational（教育的）、medical（医疗的）与语境契合度低。 20.A。考查动词词义辨析。知识点：动词情感色彩与语境理解。句意：最让我们惊讶的是，这些技术还能助力文物保护。surprises（使惊讶）符合发现科技新用途的语境；worries（使担忧）、satisfies（使满意）、disappoints（使失望）均不符。 21.B。考查同位语从句引导词。知识点：同位语从句语法规则。句意：数字技术能保护文物免遭损坏，这一事实是真实的。that 引导同位语从句，解释说明 the fact 的内容，从句成分完整。 22.A。考查宾语从句引导词。知识点：宾语从句语法规则。句意：我们确信这种趋势在未来会持续下去。that 引导宾语从句，从句成分完整，无实际意义。 23.B。考查表语从句引导词。知识点：表语从句引导词辨析。句意：其中一个问题是，我们如何让这些技术服务更多人，尤其是老年人。how（如何）表方式，符合句意；that（无实义）、what（什么）、where（哪里）均不符。 24.A。考查主语从句引导词。知识点：It is clear that... 固定句型。句意：无论面临什么问题，很明显智能技术正在让世界变得更美好。It 作形式主语，that 引导真正的主语从句。 25.B。考查副词词义辨析。知识点：副词修饰与语境理解。句意：我们有必要更多地了解这些技术，并恰当地使用它们。properly（恰当地）符合理性使用科技的语境；widely（广泛地）、quickly（快速地）、easily（容易地）均不符。 三、阅读理解（共5小题，每小题2分，共10分） 阅读下面短文，从短文后所给各题的四个选项（A、B、C 和 D）中，选出可以填入空白处的最佳选项。 Smart parcel lockers have become a common sight in cities. They are small, metal cabinets with many 1 . Users can receive a code on their phones when their packages are delivered. Then they can go to the locker, enter the code, and get their packages. Parcel lockers have many advantages. First, they are convenient. People don't have to wait for the courier at home. They can pick up their packages at any time, day or night. Second, they are 2 . Packages are kept safe in the lockers and won't get lost or wet. Third, they save time for couriers. Couriers don't have to knock on doors or call the users. They can just leave the packages in the lockers and leave. However, there are also some small problems. Some elderly people don't know how to use the lockers because they are not 3 with the technology. Also, some lockers are often full, especially during festivals. Overall, smart parcel lockers are a great invention. They make our lives easier and 4 the way we receive packages. In the future, more and more people will use them, and the technology will become even better. 文章大意：本文介绍智能快递柜的使用方式、优势、存在的小问题及总体价值，说明其改变了人们收取快递的方式。 26.The underlined word "cabinets" in Paragraph 1 probably means ______. A. rooms B. boxes C. shelves D. locks 27.What do users need to get their packages from the lockers? A. A coupon B. A drone C. A code D. A device 28.Which of the following is NOT an advantage of parcel lockers? A. They are convenient B. They are safe C. They are spacious D. They save time for couriers 29.Why do some elderly people have trouble using the lockers? A. They have no code B. They have no phone C. They are not familiar with the technology D. They are not interested in the technology 30.What is the writer's attitude towards smart parcel lockers? A. Positive B. Negative C. Neutral D. Unclear 【答案】26.B 27.C 28.C 29.C 30.A 【导语】本文是一篇说明文，介绍智能快递柜的使用方法、优势、现存小问题及价值，表明其改变了人们收取包裹的方式。 【解析】 26.B。词义猜测题。知识点：根据上下文推断词义。句意：智能快递柜是带有许多储物格的小型金属柜子。结合常识，快递柜的核心功能是存放包裹，cabinets 在此处与 boxes（箱子、储物格）含义相近；rooms（房间）、shelves（架子）、locks（锁）均不符合语境。 27.C。细节理解题。知识点：定位原文信息解题。句意：用户从快递柜取包裹需要什么？根据第一段 “Users can receive a code on their phones...enter the code, and get their packages” 可知，取件需要验证码，故选 C；coupon（优惠券）、drone（无人机）、device（设备）均未提及。 28.C。细节理解题。知识点：筛选原文信息排除干扰项。句意：以下哪项不是快递柜的优势？第二段明确提到快递柜的优势是便捷、安全、节省快递员时间，未提及 spacious（宽敞的），故选 C。 29.C。细节理解题。知识点：定位原文因果关系解题。句意：为什么部分老年人使用快递柜有困难？根据第三段 “because they are not familiar with the technology” 可知，原因是老年人不熟悉这项技术，故选 C；无手机、无验证码、不感兴趣均非原文表述的原因。 30.A。观点态度题。知识点：根据作者用词推断态度。句意：作者对智能快递柜的态度是什么？根据最后一段 “a great invention”“make our lives easier” 等积极表述可知，作者态度是肯定的，故选 A；negative（否定的）、neutral（中立的）、unclear（不明确的）均不符合。 四、情景交际（共5小题，每小题2分，共10分） 根据对话内容，从文后选择恰当的选项补全对话，其中有一项是多余的。 A. You can also scan the QR code to pay. B. How can I use this unmanned supermarket? C. What should I do if I can't connect to the Wi-Fi? D. Then you can take it to the checkout area. E. Must I restart my phone? F. You don't need to carry cash or a credit card. Li Hua: Excuse me, 31 ? Staff: It's very easy. First, you need to install the app on your phone and register an account. Li Hua: OK, I have done that. What's next? Staff: Then you can pick the things you want to buy. 32 . Li Hua: And then? How do I pay for the things? Staff: 33 . 34 . Li Hua: That's great! It's so convenient. By the way, 35 ? Staff: Don't worry. Maybe you should restart your phone. Or you can ask me for help. Li Hua: Thank you very much. Staff: You're welcome. 【答案】31.B 32.D 33.F 34.A 35.C 【导语】本文是一段顾客李华与无人超市工作人员的对话，李华咨询无人超市的使用方法和支付方式，还询问了 Wi-Fi 连接问题，工作人员逐一解答。 【解析】 31.B。知识点：根据答语推断问句。答语 “It's very easy. First, you need to install the app...” 是在介绍使用步骤，因此问句是询问无人超市的使用方法，B 选项 “我该如何使用这家无人超市？” 符合语境。 32.D。知识点：根据上下文衔接对话。上句说 “然后你可以挑选想买的东西”，下句李华问付款方式，D 选项 “然后你可以把商品带到结账区” 是购物流程的合理衔接，符合语境。 33.F。知识点：回应付款相关的提问。李华询问付款方式，F 选项 “你不需要携带现金或信用卡” 先说明支付的便捷性，为后续介绍具体支付方式铺垫，符合语境。 34.A。知识点：补充说明付款方式。前一句提到无需现金或信用卡，A 选项 “你也可以扫描二维码付款” 是具体的支付方式介绍，与前文衔接紧密，符合语境。 35.C。考查情景交际。知识点：根据答语推断问句。答语 “Don't worry. Maybe you should restart your phone...” 是在给出解决办法，C 选项 “如果我的手机连不上无线网络该怎么办？” 是提出相关问题，符合语境。 5、 书面表达（15分） 如今，智能科技（如快递柜、VR 技术、无人超市）已融入日常生活。请根据提示，写一篇短文谈谈智能科技给生活带来的变化。 要求：1. 语句通顺，语法正确，不少于 80 词；2. 开头和结尾已给出，不计入总词数。 开头：Nowadays, smart technologies are playing an important role in our daily life. 结尾：All in all, smart technologies have changed our life for the better. We should learn to use them well. 【参考例文】 Nowadays, smart technologies are playing an important role in our daily life. Smart parcel lockers are very convenient. We can pick up our packages at any time, even when we are not at home. With VR technology, we can take a virtual tour of famous places without traveling around. Unmanned supermarkets also make our shopping easier—we don’t need to wait in long lines to pay. These technologies not only save our time but also bring us a lot of fun. All in all, smart technologies have changed our life for the better. We should learn to use them well. 【导语】本文围绕 “智能科技改变日常生活” 这一主题，选取快递柜、VR 技术、无人超市三个典型例子，介绍其给生活带来的便捷，内容贴合单元核心话题，语言简洁易懂，符合 80 词以上的写作要求。 【解析】 （一）词汇积累 smart parcel lockers 智能快递柜 virtual tour 虚拟游览 unmanned supermarkets 无人超市 save time 节省时间 play an important role in 在…… 中发挥重要作用 （二）句式拓展 简单句变复合句 原句：Smart parcel lockers are very convenient. We can pick up our packages at any time. 拓展句：Smart parcel lockers, which are very convenient, allow us to pick up our packages at any time.（使用定语从句，丰富句子结构） 补充逻辑关系 原句：With VR technology, we can take a virtual tour of famous places without traveling around. 拓展句：With VR technology, we can take a virtual tour of famous places without traveling around, so we can enjoy the beauty of different places easily.（添加结果状语从句，明确逻辑关系） 【点睛】 【高分句型 1】 Unmanned supermarkets also make our shopping easier—we don’t need to wait in long lines to pay. 解析：使用破折号补充说明无人超市带来的具体便利，句式灵活，避免了简单句的重复堆砌，使表达更丰富。 【高分句型 2】 These technologies not only save our time but also bring us a lot of fun. 解析：运用 not only...but also... 并列结构，简洁明了地总结智能科技的双重好处，是议论文和说明文的常用高分句型。 原创精品资源学科网独家享有版权，侵权必究！ 学科网（北京）股份有限公司 学科网（北京）股份有限公司 $ 编写说明：本套《同步单元AB卷》紧扣《英语 拓展模块》（高教版2023修订版）教材，以教材单元为基准精准覆盖核心考点，并紧密贴合真题题型。A卷为考点梳理卷，侧重考点分层突破；B卷为单元测试卷，强化综合能力检测，助力师生高效把握教学重点，提升应试能力与知识应用水平。 本卷是 5 New Technologies in Everyday Life的单元测试卷，主要考查词汇、词组、句式句型、情景交际功能话题、阅读能力和书面表达能力。 Unit 5 New Technologies in Everyday Life B卷·单元测试卷 考试时间：60分钟 满分：100分 班级 姓名 学号 成绩 一、单项选择题（共15小题，每小题3分，共45分） 从 A、B、C、D 中，选出可以填入空白处的最佳选项。 1.A smart phone is a useful ______ that can help us do many things in daily life. A. device B. coupon C. alarm D. agenda 2.You need to ______ the app first if you want to use the unmanned supermarket service. A. delete B. install C. scan D. launch 3.______ is clear that digital technologies have greatly changed our way of life. A. This B. That C. It D. What 4.My parents took a ______ to Guilin last summer and they enjoyed the trip a lot. A. package tour B. virtual reality C. QR code D. parcel locker 5.The question is ______ we can use drones to collect data of the ancient buildings safely. A. that B. whether C. what D. where 6.We can take a ______ tour of the Palace Museum with VR glasses without leaving home. A. military B. commercial C. virtual D. average 7.______ makes the parcel locker so popular is its 24-hour service and convenience. A. Who B. What C. Which D. When 8.Please ______ the useless photos in your phone to free up more storage space. A. delete B. connect C. attend D. depend 9.The company plans to ______ a new type of smart watch next month. A. set up B. carry out C. launch D. base on 10.We don't know ______ the digital exhibition of the Great Wall will start. A. that B. where C. when D. what 11.The seats in the new subway are more ______ than the old ones. A. spacious B. advanced C. military D. commercial 12.It is reported ______ 3D printing technology has been used to restore some cultural relics. A. that B. what C. how D. why 13.You can ______ your phone to the Wi-Fi in the library to surf the Internet for free. A. scan B. connect C. delete D. launch 14.The ______ of this new technology is that it leaves the least amount of waste. A. advantage B. agenda C. alarm D. press 15.Every ______ at the tech conference was given a free smart bracelet. A. coupon B. attendee C. package D. drone 二、完形填空（共 10 小题；每小题 2 分，满分 20 分） 阅读下面短文，从短文后所给各题的四个选项（A、B、C 和 D）中，选出可以填入空白处的最佳选项。 Smart technologies are becoming more and more important in our daily life. Many people now use their phones to 16 QR codes for payment, which makes shopping much easier. Parcel lockers are also widely used in communities. They allow people to pick up their 17 at any time, even when they are not at home. Virtual reality is another amazing technology. With VR glasses, we can have a 18 tour of famous places around the world without traveling. Drones are also playing a big role in many fields. Some are used for taking photos, while others are used for 19 purposes. What 20 us most is that these technologies are also helping protect cultural relics. For example, 3D models can show every detail of ancient buildings. The fact 21 digital technologies can save cultural relics from being damaged is true. We are sure 22 this trend will continue in the future. However, there are still some problems. One of them is 23 we can make these technologies serve more people, especially the elderly. Another problem is how to keep the data safe when using these technologies. No matter what problems we face, it is clear 24 smart technologies are changing the world for the better. It is necessary for us to learn more about them and use them 25 . 16.A. scan B. delete C. install D. launch 17.A. coupons B. packages C. drones D. devices 18.A. military B. commercial C. virtual D. average 19.A. cultural B. educational C. medical D. military 20.A. surprises B. worries C. satisfies D. disappoints 21.A. what B. that C. which D. why 22.A. that B. whether C. what D. how 23.A. that B. how C. what D. where 24.A. that B. what C. which D. who 25.A. widely B. properly C. quickly D. easily 三、阅读理解（共5小题，每小题2分，共10分） 阅读下面短文，从短文后所给各题的四个选项（A、B、C 和 D）中，选出可以填入空白处的最佳选项。 Smart parcel lockers have become a common sight in cities. They are small, metal cabinets with many 1 . Users can receive a code on their phones when their packages are delivered. Then they can go to the locker, enter the code, and get their packages. Parcel lockers have many advantages. First, they are convenient. People don't have to wait for the courier at home. They can pick up their packages at any time, day or night. Second, they are 2 . Packages are kept safe in the lockers and won't get lost or wet. Third, they save time for couriers. Couriers don't have to knock on doors or call the users. They can just leave the packages in the lockers and leave. However, there are also some small problems. Some elderly people don't know how to use the lockers because they are not 3 with the technology. Also, some lockers are often full, especially during festivals. Overall, smart parcel lockers are a great invention. They make our lives easier and 4 the way we receive packages. In the future, more and more people will use them, and the technology will become even better. 文章大意：本文介绍智能快递柜的使用方式、优势、存在的小问题及总体价值，说明其改变了人们收取快递的方式。 26.The underlined word "cabinets" in Paragraph 1 probably means ______. A. rooms B. boxes C. shelves D. locks 27.What do users need to get their packages from the lockers? A. A coupon B. A drone C. A code D. A device 28.Which of the following is NOT an advantage of parcel lockers? A. They are convenient B. They are safe C. They are spacious D. They save time for couriers 29.Why do some elderly people have trouble using the lockers? A. They have no code B. They have no phone C. They are not familiar with the technology D. They are not interested in the technology 30.What is the writer's attitude towards smart parcel lockers? A. Positive B. Negative C. Neutral D. Unclear 四、情景交际（共5小题，每小题2分，共10分） 根据对话内容，从文后选择恰当的选项补全对话，其中有一项是多余的。 A. You can also scan the QR code to pay. B. How can I use this unmanned supermarket? C. What should I do if 我 can 我 can't connect to the Wi-Fi? D. Then you can take it to the checkout area. E. Must I restart my phone? F. You don't need to carry cash or a credit card. Li Hua: Excuse me, 31 ? Staff: It's very easy. First, you need to install the app on your phone and register an account. Li Hua: OK, I have done that. What's next? Staff: Then you can pick the things you want to buy. 32 . Li Hua: And then? How do I pay for the things? Staff: 33 . 34 . Li Hua: That's great! It's so convenient. By the way, 35 ? Staff: Don't worry. Maybe you should restart your phone. Or you can ask me for help. Li Hua: Thank you very much. Staff: You're welcome. 5、 书面表达（15分） 如今，智能科技（如快递柜、VR 技术、无人超市）已融入日常生活。请根据提示，写一篇短文谈谈智能科技给生活带来的变化。 要求：1. 语句通顺，语法正确，不少于 80 词；2. 开头和结尾已给出，不计入总词数。 开头：Nowadays, smart technologies are playing an important role in our daily life. 结尾：All in all, smart technologies have changed our life for the better. We should learn to use them well. 原创精品资源学科网独家享有版权，侵权必究！ 学科网（北京）股份有限公司 学科网（北京）股份有限公司 $