Unit 4 Then and now 语法Grammar 让步状语从句-2025-2026学年八年级英语上册单元重难点易错题精练（沪教版五四学制2024）

班级 姓名 学号 分数 Unit 4 Then and now 让步状语从句 （时间：60分钟，满分：100分） 一、单项选择(本大题共40小题，每小题2分，共80分) 1．________ we face the difficulties of today and tomorrow, I still have a dream. A．Even though B．As soon as C．As long as D．Ever since 【答案】A 【详解】句意：即使我们面对今天和明天的困难，我仍然有一个梦想。 考查连词辨析。Even though即使；As soon as一……就……；As long as只要；Ever since从那时起。根据“… we face the difficulties of today and tomorrow, I still have a dream.”可知，句子前后表示让步关系，应该用Even though引导让步状语从句。故选A。 2．________ the prices are a little higher at that supermarket, we still like to go shopping there. A．Although B．As long as C．Since D．So 【答案】A 【详解】句意：虽然那家超市的价格有点高，我们仍然喜欢去那里购物。 考查连词辨析。Although尽管；As long as只要；Since自从；So因此。根据“the prices are a little higher at that supermarket”和“we still like to go shopping there”可知，前半句是后半句的让步状语，所以用although引导让步状语从句，故选A。 3．The little boy succeeded in reaching the camp, ________ he fell over several times all the way. A．until B．but C．even though D．so that 【答案】C 【详解】句意：小男孩成功到达营地，尽管一路上他摔倒了几次。 考查连词辨析。until直到；but但是；even though尽管；so that以便于。根据“The little boy succeeded in reaching the camp”和“he fell over several times all the way.”可知，此处引导一个让步状语从句，应用“even though”，故选C。 4．—I really want to go to the park today. —________ it’s raining heavily, we can still go there. A．Because B．Although C．So D．Before 【答案】B 【详解】句意：——我今天真的很想去公园。——尽管下着大雨，我们仍然可以去。 考查连词辨析。Because因为；Although尽管；So所以；Before在……之前。根据语境可知，前后句为让步关系（“下雨”与“仍然去”形成对比），需用表示让步的连词。故选B。 5．________ my grandpa is nearly 80, he is still very active. A．Unless B．Although C．Because D．Until 【答案】B 【详解】句意：虽然我爷爷快80岁了，但他仍然很活跃。 考查从属连词辨析。Unless除非；Although虽然；Because因为；Until直到。根据“…my grandpa is nearly 80, he is still very active.”可知，此处指的是虽然爷爷快80岁了，应用“although”引导的让步状语从句。故选B。 6．________ Zhang Guimei isn’t healthy, she still works hard every day. A．Although B．As soon as C．Because D．When 【答案】A 【详解】句意：虽然张桂梅身体不好，但她每天仍然努力工作。 考查连词辨析。Although虽然；As soon as一……就；Because因为；When当……时候。分析句子可知，前后两句是让步关系，用although引导让步状语从句。故选A。 7．—What do you like to do when it rains? —________ it rains, I enjoy watching movies at home. A．Whenever B．Whatever C．Wherever D．However 【答案】A 【详解】句意：——下雨的时候你喜欢做什么？——每当下雨的时候，我就喜欢待在家里看电影。 考查从属连词辨析。whenever无论何时；whatever无论什么；wherever无论在哪里；however然而，无论如何。根据“it rains”可知此处应用whenever引导让步状语从句，强调每当下雨的时候。故选A。 8．________ robots can do lots of work for people, they cannot take our place completely. A．Because B．Although C．Until D．So 【答案】B 【详解】句意：虽然机器人可以为人类做很多工作，但它们不能完全取代我们。 考查连词辨析。Because因为；Although虽然；Until直到；So所以。根据“robots can do lots of work for people, they cannot take our place completely.”可知前后构成让步关系，应用although引导让步状语从句，故选B。 9．________ the car is old, it still runs well. A．But B．Because C．Although 【答案】C 【详解】句意：尽管车很旧，但仍然运行良好。 考查连词辨析。But但是；Because因为；Although尽管。根据句意可知，前后句子构成让步关系，应用Although引导让步状语从句。故选C。 10．My cousin can help with the housework ________ she is very young. A．if B．though C．because D．so 【答案】B 【详解】句意：尽管我的表妹很小，但她能够帮忙做家务。 考查连词辨析。if如果；though尽管；because因为；so所以。根据题干可知，前后句之间是转折让步关系，应用though引导让步状语从句。故选B。 11．________ my parents are both busy, they often take my sister and me to the park on weekends. A．If B．When C．Although D．Until 【答案】C 【详解】句意：尽管我的父母都很忙，他们经常在周末带我和妹妹去公园。 考查从属连词辨析。If如果，引导条件状语从句；When当……时候，引导时间状语从句；Although尽管，引导让步状语从句；Until直到……时候，引导时间状语从句。根据“my parents are both busy, they often take my sister and me to the park on weekends”可知，此处有转折的含义，应用although引导让步状语从句。故选C。 12．Maybe I’m not very healthy, _________ I have healthy habits. A．and B．because C．although 【答案】C 【详解】句意：也许我不是很健康，尽管我有健康的习惯。 考查连词。and并且；because因为；although尽管。根据题干语境可知，前后的意思是让步关系，也就是尽管有健康习惯，但不一定很健康，应用although引导让步状语从句，故选C。 13．______ Mr. Smith is strict, he’s popular with his students. A．Though B．When C．After 【答案】A 【详解】句意：虽然史密斯老师很严格，但他在学生中很受欢迎。 考查连词辨析。Though虽然；When当……时；After在……以后。根据“...Mr. Smith is strict, he’s popular with his students.”可知，“虽然”史密斯老师很严格，是though引导让步状语从句。故选A。 14．________ he tried his best to work hard, he didn’t pass the exam. A．Unless B．Until C．If D．Though 【答案】D 【详解】句意：他尽了最大的努力，但他没有通过考试。 考查连词辨析。Unless 除非；Until直到；If 如果；Though尽管。由“he tried his best to work hard”和“he didn’t pass the exam”可知，二者是让步关系。故选D。 15．Mike, a 7-year-old boy, has a great talent for art. He can draw nice pictures ________ he has never learned it. A．if B．so C．though D．because 【答案】C 【详解】句意：迈克，一个7岁的男孩，有很好的艺术天赋。尽管他从未学过，但他能画出漂亮的画。 考查连词辨析。if如果；so所以；though尽管；because因为。根据“Mike,… has a great talent for art.”可知，此处指尽管他从未学过，但他能画出漂亮的画，用though引导让步状语从句。故选C。 16．—My little sister hardly ever eats vegetables ________ it’s good for her health. —It’s not a good habit. A．because B．so C．and D．although 【答案】D 【详解】句意：——我的小妹妹几乎从不吃蔬菜，尽管这对她的健康有好处。——这不是个好习惯。 考查连词辨析。because因为；so所以；and和，而且；although尽管。前后句表示让步关系，所以用although引导让步状语从句，故选D。 17．________ the girl is only six years old, she knows more than 300 ancient Chinese poems. A．If B．Because C．Although D．Unless 【答案】C 【详解】句意：尽管那个女孩只有六岁，但她会三百多首中国古诗。 考查连词辨析。If如果；Because因为；Although尽管；Unless除非。分析句子，前后句表示让步关系，所以用although引导让步状语从句，故选C。 18．________ I win or lose the competition, it’s a good chance (机会) for me to learn something. A．Whether B．Unless C．Until D．When 【答案】A 【详解】句意：无论我在比赛中是赢是输，这对我来说都是一个学习的好机会。 考查状语从句。Whether是否；Unless除非；Until直到；When当……时。根据“...I win or lose the competition, it’s a good chance (机会) for me to learn something.”可知，考查whether...or..这一固定搭配，可引导让步状语从句，表示“无论……还是……”。故选A。 19．—Did you win the game yesterday? —Not really. ________ we all tried our best, we still lost it. A．While B．If C．Though D．But 【答案】C 【详解】句意：——昨天的比赛你赢了吗？——不完全是。虽然我们都尽了最大的努力，但还是输了。 考查让步状语从句。While与……同时；If如果；Though尽管；But但是。根据“...we all tried our best, we still lost it.”可知，前后句是让步关系，虽然尽力了，但比赛还是输了。故选C。 20．—I deeply believe in the power of music. —That’s true. Music brings us together ________ when we are apart. A．so that B．as soon as C．unless D．even though 【答案】D 【详解】句意：——我深信音乐的力量。——是真的。即使我们分开，音乐也能把我们聚在一起。 考查连词辨析。so that以便；as soon as一……就……；unless除非；even though尽管。根据“Music brings us together...when we are apart.”可知，前后句之间表达的是一种让步关系，因此用even though引导让步状语从句。 故选D。 21．Paying online makes our life convenient. We can buy things ________ we don’t take out wallets. A．unless B．because C．even if 【答案】C 【详解】句意：网上支付使我们的生活方便。即使我们不拿出钱包，我们也可以买东西。 考查连词。unless除非；because因为；even if即使。根据“Paying online makes our life convenient. We can buy things...we don’t take out wallets.”可知，网上支付使我们的生活方便，故应是即使我们不拿出钱包，我们也可以买东西。此处应用even if引导让步状语从句。故选C。 22．________ Mike is only seven years old, he can take good care of himself. A．If B．Because C．Since D．Though 【答案】D 【详解】句意：虽然迈克只有七岁，但他能照顾好自己。 考查从属连词辨析。if如果；Because因为；Since自从；though虽然。根据“Mike is only seven years old, he can take good care of himself.”可知，前后构成让步关系，应用though引导让步状语从句，故选D。 23．__________ it was a little bit cold, the kids still had great fun playing with the snow. A．Since B．Though C．Until D．Because 【答案】B 【详解】句意：虽然天气有点冷，但孩子们玩雪仍然玩得很开心。 考查连词辨析。Since自从；Though虽然；Until直到；Because因为。本句“it was a little bit cold”和“the kids still had great fun playing with the snow”构成让步关系，though引导让步状语从句。故选B。 24．It’s not a big deal, ________ she is wrong. A．although B．because C．since D．if 【答案】A 【详解】句意：这没什么大不了的，尽管她错了。 考查连词辨析。although尽管；because因为；since自从；if如果。根据“It’s not a big deal, ... she is wrong.”可知，前后两句之间是让步关系，所以用although引导让步状语从句。故选A。 25．________ he’s big and heavy, he’s very good at sport. A．Though B．Because C．Since D．As 【答案】A 【详解】句意：尽管他又大又重，但是他很擅长运动。 考查连词辨析。Though虽然；Because因为；Since自从，既然；As因为，正如，当。根据“...he’s big and heavy, he’s very good at sport.”可知前后句为让步关系。故选A。 26．I still remember my Chinese teacher in the high school ________ we haven’t seen each other for many years. A．when B．if C．though D．as 【答案】C 【详解】句意：我仍然记得中学时候的语文老师，尽管我们已经好多年没见了。 考查连词辨析。when当……的时候；if如果；though尽管；as当。根据“I still remember my Chinese teacher in the high school”和“we haven’t seen each other for many years”可知，指的是尽管我们已经好多年未见面，但我仍然记得语文老师，是though引导的让步状语从句。故选C。 27．—I am still angry because my sister took my CDs without asking. —Forget about it. ________ she is wrong, it’s not a big deal. A．Because B．Although C．So D．But 【答案】B 【详解】句意：——我仍然很生气，因为我姐姐不问就拿走了我的CD。——算了吧。虽然她错了，但没什么大不了的。 考查连词辨析。Because因为；Although尽管；So所以；But但是。根据“…she is wrong, it’s not a big deal.”可知空格前后两句之间是让步关系，应用although引导让步状语从句，故选B。 28．________ it snowed heavily yesterday, we enjoyed ourselves. A．Although B．So C．But D．When 【答案】A 【详解】句意：尽管昨天雪下得很大，我们还是玩得很愉快。 考查although引导的让步状语从句。although尽管；so因此；but但是；when当……时。根据“...it snowed heavily yesterday, we enjoyed ourselves.”可知，前后两句构成让步关系，此处应用although引导让步状语从句。故选A。 29．—My brother can speak a little English ________ he is only five years old. —What a smart boy! A．though B．but C．because D．unless 【答案】A 【详解】句意：——尽管我弟弟只有五岁，他可以说一点英语。——真是一个聪明的男孩。 考查连词辨析。though尽管；but但是；because因为；unless除非。分析句子可知前后是让步关系，即虽然小，但是会说英语。用though引导让步状语从句。故选A。 30．Robert kept practising for the match ________ it got dark outside. A．if B．although C．so D．because 【答案】B 【详解】句意：尽管外面天黑了，罗伯特仍在为了比赛继续练习。 考查连词辨析。if如果；although尽管；so因此；because因为。根据“Robert kept practising for the match...it got dark outside.”可知，前后句是让步关系，应用although引导让步状语从句，故选B。 31．Our teachers still keep on giving lessons to us, ________ some of them are ill these days. A．although B．if C．then D．because 【答案】A 【详解】句意：我们的老师仍然继续给我们上课，尽管他们中的一些人这些天生病了。 考查连词辨析。although虽然，尽管；if如果；then那么；because因为。根据“Our teachers still keep on giving lessons to us”和“some of them are ill these days”可知，尽管一些老师生病了，他们还继续坚持上课，应用although引导让步状语从句。故选A。 32．She didn’t win the singing competition ________ she tried her best. A．although B．if C．so D．because 【答案】A 【详解】句意：虽然她尽了最大的努力，但还是没有赢得歌唱比赛。 考查连词辨析。although尽管；if如果；so因此；because因为。根据“She didn’t win the singing competition…she tried her best”可知，尽管她很努力，但是没有赢得歌唱比赛，故此处应该用although引导让步状语从句。故选A。 33．________ he is one of the most famous scientists, Yuan Longping sees himself as a common man. A．Unless B．Because C．Although 【答案】C 【详解】句意：虽然袁隆平是最著名的科学家之一，但他认为自己只是一个普通人。 考查连词辨析。Unless除非；Because因为；Although虽然。根据“he is one of the most famous scientists”以及“Yuan Longping sees himself as a common man.”可知前后句存在让步关系，只能填although。故选C。 34．________ many things change a lot, a love of sports doesn’t change a bit. A．If B．Before C．Though D．Because 【答案】C 【详解】句意：尽管很多事情都改变了很多，但对体育的热爱丝毫没有改变。 考查连词辨析。If如果；Before在……之前；Though尽管；Because因为。根据“many things change a lot, a love of sports doesn’t change a bit.”可知，两句为让步关系，虽然事情变了，但是对于体育的爱没有变，所以此处用Though引导让步状语从句。故选C。 35．_________ he is ill, _________ he goes to school on time. A．Although, but B．Although, and C．Although, / D．/, although 【答案】C 【详解】句意：尽管他病了，他还是按时上学。 考查连词。although尽管；but但；and和。although和but不能同时使用，排除A；根据“he goes to school on time.”可知是尽管他病了，但是他按时去上学。故选C。 36．—________ Ms. Chen looks serious and strict, she is truly friendly to us. —I agree. A．Because B．Although C．Through D．If 【答案】B 【详解】句意：——虽然陈老师看起来严肃且严格，但她对我们真的很友好。——我同意。 考查连词辨析。because因为；although尽管；through通过；if如果。根据“Ms. Chen looks serious and strict, she is truly friendly to us.”可知前后句是转折让步关系，应用although引导让步状语从句。故选B。 37．—It’s not very cold today ________ it is snowing. —Yes. How about playing outside? A．what B．if C．so D．though 【答案】D 【详解】句意：——虽然今天在下雪，但并不很冷。——是的。出去玩怎么样？ 考查词汇辨析。what什么；if如果；so因此；though虽然。分析句子和语境可知，空格前后在句意上是让步关系，表示“虽然下雪，但是不冷”，所以空处用though引导让步状语从句，故选D。 38．Many great people never gave up, ________ they failed many times. A．and B．but C．because D．although 【答案】D 【详解】句意：许多伟大的人从不放弃，尽管他们失败了很多次。 考查连词辨析。and和；but但是；because因为；although尽管。根据“Many great people never gave up, ... they failed many times.”可知，前后句是让步关系，用although引导让步状语从句。故选D。 39．________ they are very tired, ________ they are very happy. A．/, although B．Although, / C．Although, but D．But, although 【答案】B 【详解】句意：虽然他们很累，但他们很开心。 考查连词辨析。although虽然，常置于句首；but但是。空格置于句首，前后句构成转折关系，用“although”引导，although和but不能同时出现。故选B。 40．________ it rained a lot, they had fun in their vacation. A．Unless B．Because C．Although 【答案】C 【详解】句意：虽然雨下得很大，但他们假期过得很开心。 考查连词辨析。Unless除非；Because因为；Although尽管。根据“... it rained a lot, they had fun in their vacation.”可知，尽管雨下得很大，但他们假期玩得开心，前后句为让步关系，应用although引导让步状语从句。故选C。 二、完成句子(本大题共10小题，每小题2分，共20分) 41．尽管他很累，还是完成了工作。 he was tired, he finished the work. 【答案】 Even if/though 【详解】根据题干可知，even if/though表示“尽管”，引导让步状语从句。故填Even；if/though。 42．虽然他错了，但不是大问题。 she is wrong, it’s not a big deal. 【答案】Although/Though 【详解】根据句意可知，“虽然”的英文是“although”或“though”，属于连词，在句子中用于引导让步状语从句，也就是先承认“she is wrong（她错了）”这个情况，再转折说明“it’s not a big deal（不是大问题）”。故填Although/Though。 43．无论你是否同意，这都是他的最终决定。（完成译句） you agree disagree, this is his final decision. 【答案】 Whether or 【详解】由汉语和所给的英语翻译可知“无论是否”译成：whether…or，句子开头，首字母大写。 故填Whether；or。 44．无论发生什么事，我们都不应该放弃。 happens, we should never give up. 【答案】 No matter what 【详解】对比所给中英文可知，设空处为“无论什么”，no matter what“无论什么”，引导让步状语从句，句首首字母大写。故填No；matter；what。 45．无论发生什么，她都不会放弃梦想。 She won’t give up her dream what happens. 【答案】 no matter 【详解】no matter“无论”，“no matter+疑问词”引导让步状语从句。故填no；matter。 46．虽然玛丽很累了，但她仍然坚持工作。 Mary is tired, she keeps on working. 【答案】Though/Although 【详解】虽然：though/although，引导让步状语从句。故填Though/Although。 47．即使遇到了很多困难，他也从未放弃。 he met many difficulties, he never gave up. 【答案】 Even if/though 【详解】根据中英文对照，横线上缺的是“即使”even if/though，位于句首，首字母大写。故填Even；if/though。 48．无论你买什么，你可能会认为它们生产于那些国家。 you may buy, you might think they were made in those countries. 【答案】 No matter what 【详解】无论什么：no matter what，引导让步状语从句。故填No；matter；what。 49．无论雨下多久，彩虹最终将会出现。 the rain lasts, there will be a rainbow in the end. 【答案】 No matter how long 【详解】no matter how long“无论多久”，句首需大写首字母，故填No；matter；how；long。 50．无论她表面上多么高兴，她的内心是悲哀的。    how happy her surface is, her heart is sad. 【答案】 No matter 【详解】no matter“无论/不管”，和疑问词连用引导让步状语从句，位于句首需大写首字母。本句用“No matter how...”表示“无论怎么……”。故填No；matter。 试卷第1页，共3页 试卷第1页，共3页 学科网（北京）股份有限公司 $$ 班级 姓名 学号 分数 Unit 4 Then and now 让步状语从句 （时间：60分钟，满分：100分） 一、单项选择(本大题共40小题，每小题2分，共80分) 1．________ we face the difficulties of today and tomorrow, I still have a dream. A．Even though B．As soon as C．As long as D．Ever since 2．________ the prices are a little higher at that supermarket, we still like to go shopping there. A．Although B．As long as C．Since D．So 3．The little boy succeeded in reaching the camp, ________ he fell over several times all the way. A．until B．but C．even though D．so that 4．—I really want to go to the park today. —________ it’s raining heavily, we can still go there. A．Because B．Although C．So D．Before 5．________ my grandpa is nearly 80, he is still very active. A．Unless B．Although C．Because D．Until 6．________ Zhang Guimei isn’t healthy, she still works hard every day. A．Although B．As soon as C．Because D．When 7．—What do you like to do when it rains? —________ it rains, I enjoy watching movies at home. A．Whenever B．Whatever C．Wherever D．However 8．________ robots can do lots of work for people, they cannot take our place completely. A．Because B．Although C．Until D．So 9．________ the car is old, it still runs well. A．But B．Because C．Although 10．My cousin can help with the housework ________ she is very young. A．if B．though C．because D．so 11．________ my parents are both busy, they often take my sister and me to the park on weekends. A．If B．When C．Although D．Until 12．Maybe I’m not very healthy, _________ I have healthy habits. A．and B．because C．although 13．______ Mr. Smith is strict, he’s popular with his students. A．Though B．When C．After 14．________ he tried his best to work hard, he didn’t pass the exam. A．Unless B．Until C．If D．Though 15．Mike, a 7-year-old boy, has a great talent for art. He can draw nice pictures ________ he has never learned it. A．if B．so C．though D．because 16．—My little sister hardly ever eats vegetables ________ it’s good for her health. —It’s not a good habit. A．because B．so C．and D．although 17．________ the girl is only six years old, she knows more than 300 ancient Chinese poems. A．If B．Because C．Although D．Unless 18．________ I win or lose the competition, it’s a good chance (机会) for me to learn something. A．Whether B．Unless C．Until D．When 19．—Did you win the game yesterday? —Not really. ________ we all tried our best, we still lost it. A．While B．If C．Though D．But 20．—I deeply believe in the power of music. —That’s true. Music brings us together ________ when we are apart. A．so that B．as soon as C．unless D．even though 21．Paying online makes our life convenient. We can buy things ________ we don’t take out wallets. A．unless B．because C．even if 22．________ Mike is only seven years old, he can take good care of himself. A．If B．Because C．Since D．Though 23．__________ it was a little bit cold, the kids still had great fun playing with the snow. A．Since B．Though C．Until D．Because 24．It’s not a big deal, ________ she is wrong. A．although B．because C．since D．if 25．________ he’s big and heavy, he’s very good at sport. A．Though B．Because C．Since D．As 26．I still remember my Chinese teacher in the high school ________ we haven’t seen each other for many years. A．when B．if C．though D．as 27．—I am still angry because my sister took my CDs without asking. —Forget about it. ________ she is wrong, it’s not a big deal. A．Because B．Although C．So D．But 28．________ it snowed heavily yesterday, we enjoyed ourselves. A．Although B．So C．But D．When 29．—My brother can speak a little English ________ he is only five years old. —What a smart boy! A．though B．but C．because D．unless 30．Robert kept practising for the match ________ it got dark outside. A．if B．although C．so D．because 31．Our teachers still keep on giving lessons to us, ________ some of them are ill these days. A．although B．if C．then D．because 32．She didn’t win the singing competition ________ she tried her best. A．although B．if C．so D．because 33．________ he is one of the most famous scientists, Yuan Longping sees himself as a common man. A．Unless B．Because C．Although 34．________ many things change a lot, a love of sports doesn’t change a bit. A．If B．Before C．Though D．Because 35．_________ he is ill, _________ he goes to school on time. A．Although, but B．Although, and C．Although, / D．/, although 36．—________ Ms. Chen looks serious and strict, she is truly friendly to us. —I agree. A．Because B．Although C．Through D．If 37．—It’s not very cold today ________ it is snowing. —Yes. How about playing outside? A．what B．if C．so D．though 38．Many great people never gave up, ________ they failed many times. A．and B．but C．because D．although 39．________ they are very tired, ________ they are very happy. A．/, although B．Although, / C．Although, but D．But, although 40．________ it rained a lot, they had fun in their vacation. A．Unless B．Because C．Although 二、完成句子(本大题共10小题，每小题2分，共20分) 41．尽管他很累，还是完成了工作。 he was tired, he finished the work. 42．虽然他错了，但不是大问题。 she is wrong, it’s not a big deal. 43．无论你是否同意，这都是他的最终决定。（完成译句） you agree disagree, this is his final decision. 44．无论发生什么事，我们都不应该放弃。 happens, we should never give up. 45．无论发生什么，她都不会放弃梦想。 She won’t give up her dream what happens. 46．虽然玛丽很累了，但她仍然坚持工作。 Mary is tired, she keeps on working. 47．即使遇到了很多困难，他也从未放弃。 he met many difficulties, he never gave up. 48．无论你买什么，你可能会认为它们生产于那些国家。 you may buy, you might think they were made in those countries. 49．无论雨下多久，彩虹最终将会出现。 the rain lasts, there will be a rainbow in the end. 50．无论她表面上多么高兴，她的内心是悲哀的。    how happy her surface is, her heart is sad. 试卷第1页，共3页 试卷第1页，共3页 学科网（北京）股份有限公司 $$