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UNIT 4　单元仿真验收性评价
(时间：100分钟，满分：120分。选择题请在答题区内作答，主观题请在题后作答)
第一部分：阅读(共两节，满分50分)
第一节(共15小题；每小题2.5分，满分37.5分)
阅读下列短文，从每题所给的A、B、C、D四个选项中选出最佳选项。
A
If you want to know information about different types of earphones, please click on the link we provide.Check out and find the suitable ones for your needs.
Type A
The earphones have six microphones and deliver a clear, crisp voice.They also let you change the default button functions on the earphones, which is excellent for runners who tend to touch the earphones while running.Thanks to the button, the earphones don't move, even on sweaty runs, and they're also water and sweat proof.
Battery (电池) life (playtime): 8 hours
Charging (充电) time: 2.5 hours
Type B
The pairs perfectly with any smartphone model have top quality noise cancellation (取消)．The earphones connect automatically when you take the earphones out of the slim charging case.It takes some time to adjust to the different tap commands and positions, but after some field testing, everything feels natural.
Battery life (playtime): 5 hours
Charging time: 75 minutes (wired)
Type C
We love how quickly the earphones pair with our devices, including several laptops and smartphones — we don't even need to refer to the instructions.They are extremely comfortable, even after hours of continuous use.The sound quality is also excellent.
Battery life (playtime): 10 hours
Charging time: 2 hours
Type D
The makers take the already successful earphones pros and upgrade nearly every aspect in the second generation.Sound is crisp and clear, whether listening to music or podcasts, or while on a call.The portable case also gets an upgrade.
Battery life (playtime): 6 hours
Charging time: 1 hour
1．Which earphones best suit people who enjoy running
A．Type A．　　　　　　　　 B．Type B.
C．Type C. D．Type D.
2．What is the advantage of Type C earphones
A．They have six microphones.
B．They have the longest battery life.
C．They require the least charging time.
D．They provide high quality noise cancellation.
3．From which is the text probably taken
A．A magazine. B．A textbook.
C．A travel brochure. D．A website.
B
This past Tuesday, I had my first ride in an autonomous car.The expectation for me was a bit like a kid waiting for holidays.But when I shared my passion with friends, many warned me to make sure my life insurance was paid in full before getting into the car.
The car looked pretty much like any other car on the road.The most amazing thing about the experience was how un amazing it was.I'll admit to being a bit disappointed at how normal it all seemed.I'm ready for a car with no driving wheel (方向盘) and a meeting table in the back.But it'll be a long time before most people are ready to go there.That's why the self driving engineers want to create a comforting sense of lasting.They think it may take 25 years before we get fully autonomous cars.But whenever it arrives, rather than seeming like a great step forward, the autonomous driving felt like just another baby step in a line of continuous progress.
That's because the plan is a combination of human and autonomous driving.The car I experienced is designed for highway driving.If the human driver doesn't respond in time, the autonomous driver assumes something is wrong and carefully guides the car to the shoulder.At any point, however, all the driver has to do to regain control is touch the wheel or brake (刹车)．
This combination will let the autonomous car industry grow one step at a time so that society gets comfortable with it.The earliest consumer models will probably handle only certain tasks like highway driving and parking.Humans will still be responsible for the more challenging steps like dealing with side streets.Gradually, over a period of many years, the role of the human driver will wind down.
4．What is the friends' attitude towards the author's self driving experience
A．Favourable. B．Indifferent.
C．Objective. D．Concerned.
5．What can be inferred from paragraph 2
A．The author was disappointed at the car.
B．The engineers express cautious optimism.
C．Not all the people accept self driving cars.
D．The car was equipped with modern comforts.
6．Why does the author think autonomous driving is only a small step
A．It poses a threat to humans.
B．Human driving still matters.
C．The technology is imperfect.
D．It only targets highway drivers.
7．Which of the following best describes the combination of human and autonomous driving
A．Demanding. B．Challenging.
C．Inspirational. D．Progressive.
C
Nao, the first robot able to show feelings, has been created by a European research team.When Nao is sad, he lowers his head and looks down.When he's happy, he raises his arms for a hug.Nothing is out of the ordinary, except that Nao is a robot.
“We're modeling the first years of life，” says Lola Canamero, a computer scientist at the University of Hertforshire.“The feelings are shown through physical gestures and body movements rather than facial or verbal (言语的) expressions.”
In the future, says the scientist, robots are likely to act as companions, provide support for old people, and help people shop online.In such uses, the display of feeling will be important in making the interactions (交往) more natural and comfortable.
Nao has been programmed to copy the emotional skills of a one year old child.It can memorize faces, and knows the basic rules of good and bad.Based on these it can decide how to react to what is going on.The actions going with each feeling are pre programmed, but Nao decides for itself when to display them.
Nao is also programmed to have different personalities.A more independent robot is less likely to call for help when exploring a room, while a more fearful robot will show distress if it finds something in the room that may be harmful.
Canamero's team will take its emotional programming forward into medical applications.Part of the project will look at ways to use robots in hospitals to support the roles of doctors, nurses and parents.Children might find that a small, friendly looking robot that can understand their emotional states makes them less anxious.“We want to explore different roles — the robots will help the children to understand their treatment and explain what they have to do.We want to help the children to control their anxiety，” she says.
8．According to the text, what can we know about Nao
A．Nao displays different feelings in different situations.
B．Nao is able to imitate adult emotional displays.
C．Nao can remember people's feelings.
D．Nao learns emotions from facial expressions.
9．What can we learn from the text
A．Scientists worked on facial and spoken expressions to create Nao's emotions.
B．The time when Nao displays feelings has been pre programmed.
C．Emotional programming is used in medicine production.
D．Robots with emotional skills can help children feel more comfortable.
10．What does the underlined word “distress” in paragraph 5 probably mean
A．Courage. B．Anxiety.
C．Anger. D．Satisfaction.
11．What is the text mainly about
A．The relationship between humans and robots.
B．The roles that robots play in different fields.
C．The first robot able to show feelings.
D．The long history of robots.
D
People who have trouble walking or moving around often have a hard time enjoying the beach.But hundreds of beaches in Greece now offer a new way for people in wheelchairs to get into the water by themselves.It's called Seatrac.
Seatrac is basically a chair on a moving ramp (坡道) that can carry a disabled person into the sea.It is operated by remote (远程的) control.Once in the sea, the person can either remain in the chair, enjoying the water, or go for a swim.When the person is ready to get out of the water, the Seatrac system brings the chair back to the top of the ramp.
Seatrac was invented and developed in Greece.When one of the inventors, Ignatios Fotiou, was talking with a friend who used a wheelchair, the friend said he enjoyed the sea, but didn't like having to be carried into the ocean.Mr Fotiou realized there must be a way to make it easier for wheelchair users to get into the water.Mr Fotiou worked with his partner and a professor at a Greek university to design the system.Finally, they formed a company called TOBEA to build and sell the systems.
The company worked hard to make the system simple enough to be put in place and easy to run.A wooden walkway allows wheelchair users to reach the Seatrac.The system uses solar (太阳能的) power.It doesn't require outside power, and can continue to run even if the electricity goes out.The Seatrac system can easily be packed up and stored when the swimming season ends.
The Seatrac system is being used at over 220 beaches in Greece, Cypris, Italy, and Latvia.TOBEA hopes to offer Seatrac in other countries.TOBEA has created a website showing where beaches with these special services can be found.The Greek government hopes that Seatrac will help attract more tourists to the country.
12．What is Seatrac able to do
A．Watch out of the disabled in the sea.
B．Choose the suitable beach for the disabled.
C．Help the disabled get in and out of the sea safely.
D．Enable the disabled to move around the beach freely.
13．What made Mr Fotiou decide to develop Seatrac
A．His partner's advice.
B．His love for the sea.
C．His wish to start a company.
D．The difficulty his friend faced.
14．What does the author think of the Seatrac system
A．It is becoming more popular.
B．It should be well protected.
C．It needs to be fully introduced to the public.
D．It is environmentally friendly and convenient.
15．What does the last paragraph mainly talk about
A．Expectations for Seatrac.
B．The practical application of Seatrac.
C．The popularity of Seatrac.
D．Special services Seatrac provides.
第二节(共5小题；每小题2.5分，满分12.5分)
阅读下面短文，从短文后的选项中选出可以填入空白处的最佳选项。选项中有两项为多余选项。
Today it is common to see people who walk about with colored wires hanging from their ears wherever they go.They move about in their personal bubbles, sometimes unaware of what's happening around them.__16__ Outside life is shut out.So are you one of “them”？
For me, walking around in my own personal bubble is perfect.__17__ What's even better, wearing earphones seems to give a signal to people which says, “I'm not available for chatting at the moment！”
Suppose, you're at work and about to make an incredible breakthrough, but a colleague suddenly turns up.At this precise moment, the slightest disturbance would break your concentration.__18__ Once again, those wires hanging from your ears would be sure to give that “Go away！” signal.
__19__ It's probably part of the growing up stage when they just want to ignore their whole family.While their mothers give them lectures about why they should do their homework, they can just turn up the volume on their music player, smile, and say “Yes, Mum.” Problem solved.
Pretty soon, not only will we have pretty colored wires hanging from our ears, but also our brains will be directly plugged into some new high tech instruments.We'll be in a virtual world, communicating with everyone else, or choosing not to, as we like.In this world, we will all be permanently plugged in.__20__ And they are changing our social habits along the way.
In the end, there is a thin line between using technology as a tool for making life better and being a slave to it! It's so strange — suddenly, I don't feel like wearing my earphones anymore.
A．Our instruments are changing quickly.
B．I also have wires hanging from my ears.
C．In the home situation, teenagers love these wires.
D．I don't have to deal with the noise from the environment.
E．After all, I am listening to my favorite music and would rather not be disturbed.
F．Listening to music through earphones is the perfect way to ignore such interruptions.
G．They walk around in their own spaces, with their personal “digital noise reduction systems”．
第二部分：语言运用(共两节，满分30分)
第一节(共15小题；每小题1分，满分15分)
阅读下面短文，从每题所给的A、B、C、D四个选项中选出可以填入空白处的最佳选项。
The new, “used” car that I bought just three months ago wouldn't start the other day.The factory battery that __21__ along with it decided that it had worked long enough and __22__ to take an early, permanent retirement.My __23__ neighbor gave me jump leads but the battery stubbornly wouldn't __24__ the charge.After getting more jump leads, I __25__ to the local auto parts store to buy a new one.Installing (安装) it was much more __26__ than we thought, so I took it to a local mechanic who finally got the new battery in and the car __27__ once again.
Driving it this morning, though, I __28__ that the time and the date on the screen in the dashboard (仪表板) had __29__ gone back to nine years ago, resetting to the__30__ date of the first time it was started.While my son smartly figured out how to __31__ it back to today, I thought about all the times I had wished I could go back in time and undo some of the __32__ and missteps I had taken in my own life.
Yes, many of my choices brought me __33__ in the past, but they have also brought me wisdom for the present.When you __34__ your own life, don't regret the roads not taken.Instead, be __35__ with the path you are on, the things you have learned, and the love you have shared.
21．A.came　　　　　　　　　　 B．waited
C．left D．raced
22．A.planned B．refused
C．chose D．managed
23．A.easy going B．kind hearted
C．hard working D．good tempered
24．A.lead B．take
C．offer D．hold
25．A.welcomed B．headed
C．returned D．got
26．A.complex B．vital
C．efficient D．accurate
27．A.switching B．jumping
C．running D．shaking
28．A.guessed B．remembered
C．expected D．noticed
29．A.suddenly B．slightly
C．casually D．secretly
30．A.final B．original
C．special D．temporary
31．A.bring B．program
C．call D．drive
32．A.attempts B．effects
C．mistakes D．changes
33．A.damage B．pain
C．peace D．convenience
34．A.look at B．come out of
C．focus on D．take control of
35．A.faced B．patient
C．strict D．pleased
第二节(共10小题；每小题1.5分，满分15分)
阅读下面短文，在空白处填入1个适当的单词或括号内单词的正确形式。
The virtual technology is gaining 36.____________ (popular) among businesses and becoming more important in offering customers a better experience.
37._____________ (recent), Johnson has shown how a virtual mirror called Dangle works.It lets store customers try on different earrings (耳环) without touching a single pair.It just uses the smartphone's camera and its facial recognition technology to make it appear as if the user is wearing earrings.The digital earrings in 38.____________ image appear almost real.They move with the user, 39.____________ (provide) a realistic experience.
There are other good reasons to use the virtual mirror.Trying on products with it 40.____________ (mean) there is nothing to damage, lose or at risk of being stolen.“Jewelry is quite expensive.This is a way to keep it secure, while people are thinking about 41.____________ they prefer，” he said.
Virtual mirrors work well with another product that takes time and effort to try on: makeup.A company called MemoMi has developed a smart mirror that lets customers virtually put 42.____________ makeup.At its stores, customers can use it to see how beauty products would look on 43.____________ (they) face.
The MemoMi mirror is also designed 44.____________ (teach) users how to use the products.It can record a beauty care expert trying makeup on a model, along with notes and spoken 45.____________ (direction)．The recording can also be shared with others on social media.
第三部分：写作(共两节，满分40分)
第一节(满分15分)
假定你是李华，上周末你参加了学校组织的市科技馆研学活动。请你在校英文论坛上发表一篇帖子，分享此次经历，内容包括：
1．活动过程；　2.个人感悟；　3.期待评论。
注意：1.写作词数应为80左右；　2.请按如下格式作答。
An Unforgettable Tech Exploration Tour
　
　
第二节(满分25分)
阅读下面材料，根据其内容和所给段落开头语续写两段，使之构成一篇完整的短文。
Back in the early 1980s, the idea of home computers was catching on.I wasn't keen on getting one.Somehow, I evolved and have owned several computers over the years.Some days, I loved my computer, but more often than not, I hated it.I didn't grow up with them, and they were a challenge to my mental health.Dealing with modern technology was my introduction to stress, and I know who to blame: my children.
They weren't satisfied that their dad and I finally bought a computer and learned to send emails.We were quite happy with that, but next came a cellphone.Then just talking on the phone was not acceptable; they insisted we learn to text as well.We couldn't get a break.
I remember well the night that a social app became very popular around here.Those kids of ours were determined to set up a joint account for us.It took some convincing.We felt no guilt for grating on (激怒) their nerves considering the drama they'd sometimes created for us during their teenage years.A little payback wouldn't hurt those two.
More recently, my husband and I were forced into getting rid of our flip phones and getting smartphones.I will admit that I progressed into appreciating mine.I liked speaking to Siri and finding out what I needed to know in an instant.I enjoyed having Internet access everywhere I went.I felt a sense of accomplishment; my husband — not so much.To this day, he would happily take back his flip phone.
Last Christmas, our children surprised us with yet another popular form of technology — Alexa.The girls took our smartphones in hand and got us programmed.Before we fully understood what was happening, we could tell Alexa to turn our lamp on or off, and she would.To be honest, we were a bit annoyed at having to learn how to use yet another device, but we decided to keep it.We mastered turning the lamp on and off, and once again I got the hang of it sooner than my husband did.I became his Alexa coach.
注意：1.续写词数应为150左右；　2.请按如下格式作答。
One night, Alexa did not turn on the lamp when I gave the command.　
　
We should thank our children and grandchildren.　
　
　
　
UNIT 4　单元仿真验收性评价
第一部分
语篇解读：本文是一篇应用文。文章主要介绍了不同类型的耳机。　　
1．选A　细节理解题。根据Type A中的介绍“They also let you change the default button functions on the earphones, which is excellent for runners who tend to touch the earphones while running.” 可知，Type A耳机最适合喜欢跑步的人。
2．选B　细节理解题。根据Type C中的“Battery life (playtime): 10 hours”并对比其他类型耳机的电池寿命可知，Type C耳机的电池寿命最长。
3．选D　文章出处题。根据全文内容，特别是第一段可知，文章可能来自一个网站。
语篇解读：本文是一篇记叙文。文章讲述了作者搭乘无人驾驶汽车的经历及由此产生的感想和领悟。　　
4．选D　观点态度题。根据第一段中的“many warned me to make sure my life insurance was paid in full before getting into the car”可知，作者的朋友对于乘坐无人驾驶汽车是心存忧虑的。
5．选C　推理判断题。根据第二段中的“But it'll be a long time before most people are ready to go there.”可知，虽然作者对此已有心理预期，大部分人还是没有做好迎接无人驾驶汽车时代的准备。所以不是每个人都能接受自动驾驶汽车。
6．选B　细节理解题。根据第三段首句可知，作者之所以认为无人驾驶的进步只是很小的一步是因为该计划是人类驾驶和自动驾驶相结合的产物，人类驾驶员依旧要介入其中。
7．选D　细节理解题。根据最后一段中的“This combination will let the autonomous car industry grow one step at a time ...Gradually ... the role of the human driver will wind down.”可知，这种结合让自动驾驶汽车行业一步步发展，让社会逐渐适应它。
语篇解读：本文是一篇说明文。文章讲述了一个欧洲研究团队发明了一个能够通过姿势表达情感的机器人Nao，希望能将这种情感程序运用在医学APP上，帮助孩子在看医生时缓解他们的焦虑。　　
8．选A　细节理解题。根据第一段中的“When Nao is sad ...arms for a hug.”可知，当Nao生气时，它会低下头；当它开心时，它会伸出手要求抱抱。说明Nao能在不同的情况下表达不同的情绪。
9．选D　细节理解题。根据最后一段中的“Children might find ... makes them less anxious.”可知，如果孩子有一个小的、可爱的又能够理解他们情感状态的机器人陪着的话，他们可能就不会那么焦虑了。
10．选B　词义猜测题。第五段提到一个独立的机器人在搜索一个空间时很少寻求帮助，是独立完成任务的。句中while“然而”是一个转折连词，连接两个句意相反的句子，由此可以判断，一个胆怯的机器人在处理一个空间内的有害东西时可能会不知所措，故画线词意为“焦虑”。
11．选C　主旨大意题。第一段提到了情感机器人Nao，下文内容围绕情感机器人的特性以及将来会运用到的场景展开，故可判断本文讲述了第一个情感机器人。
语篇解读：本文是一篇说明文。文章介绍了Seatrac系统的原理和功能及系统的应用范围和优势。　　
12．选C　细节理解题。根据第二段中“Seatrac is basically a chair on a moving ramp that can carry a disabled person into the sea.”可知，Seatrac系统能帮助残疾人安全进出大海。
13．选D　推理判断题。根据第三段第二、三句可知，朋友面临的困难让Fotiou产生了发明Seatrac的想法。
14．选D　推理判断题。根据倒数第二段最后两句可知，作者认为Seatrac系统既环保又方便。
15．选A　段落大意题。根据最后一段特别是最后两句可知，本段主要讲了对Seatrac的期望。
语篇解读：本文是一篇议论文。科技作为一种工具，本来是为了使人们的生活更美好，但人们似乎在逐渐成为科技的奴隶。
16．选G　上文提到，人们塞着耳机，沉浸在自己的世界里，有时甚至意识不到外界发生的事情；下文提到外界环境是被关闭的。故G项“他们行走在自己的空间，戴着他们自己的‘数码降噪系统(耳机)’”承上启下，符合语境。
17．选D　根据下文可知，戴着耳机是告诉别人现在自己不想讲话的一个信号。“What's even better”表明空处与后一句为并列关系，都说明戴耳机的好处。故D项“我无需应对外界的噪声”承上启下，符合语境。
18．选F　根据上文可知，就在此时此刻，一点小小的干扰都会使你注意力不集中。再根据后一句可知，你戴着耳机会暗示周围的人“走开，请勿打扰”。故F项“用耳机听音乐就是一个很好的避免干扰的方法”承上启下，符合语境。
19．选C　根据本段内容可知，本段主要讲青少年在家里戴耳机的原因，故C项“青少年喜欢在家里使用耳机”符合语境。
20．选A　根据后一句可知，它们也在改变着我们的生活方式，and提示空处与后一句为并列关系。故A项“我们的设备在快速变化”符合语境。
第二部分
语篇解读：本文是一篇夹叙夹议文。文章主要讲述了作者给汽车换电池的经历。在换了新电池后，仪表板上的时间回到了车子第一次被启动的时间。作者由此回想起以前的种种，认为不必为曾经的事遗憾终身，而要对当前的选择心存喜悦。
21．选A　根据常识可知，电池是买汽车时汽车自带的，已经工作了很长时间。come along with“随同，和……一起来”。
22．选C　根据该句中的“to take an early, permanent retirement”可知，这个电池已经用了太久，“选择”提前退休。
23．选B　根据该句中的“gave me jump leads”可知，邻居是一个热心肠(kind hearted)的人。
24．选D　根据该句中表转折的连词“but”可知，虽然邻居帮忙了，但是电池还是充不进电。hold“保存，存贮”。
25．选B　根据该句中的“to buy a new one”可知，作者去了当地的汽车配件商店。head to“朝某地走去”。
26．选A　根据下文中的“so I took it to a local mechanic ...once again”可知，安装电池远比作者想象的更复杂(complex)，所以作者把它拿到一个当地的机械修理工那里去了。
27．选C　根据该句中的“who finally got the new battery in”可知，机械修理工帮助作者安装好了电池。据此可以推知，汽车可以再次跑起来了。
28．选D　根据该句中的“that the time and the date on the screen in the dashboard”可知，作者注意到(notice)了仪表板上的时间和日期。
29．选A　根据常识可知，新装电池后，仪表板上的时间会突然回到车子第一次被启动的时间。
30．选B　参见上题解析。original意为“起初的；最早的；原来的”。
31．选B　根据语境可知，作者的儿子很聪明，想出如何将时间设定到今天。program“设定(机器、系统等的)程序”。
32．选C　根据该句中的“and missteps”可知，空处和“missteps”呼应；结合全句内容可知，作者很希望能够回到过去，避免在生活中犯下的一些错误(mistake)和失误。
33．选B　根据该句中的“but they have also brought me wisdom for the present”并结合常识可知，作者过去的许多选择给自己带来了痛苦(pain)，但它们也给现在的自己带来了智慧。
34．选A　根据该句中的“don't regret the roads not taken”可知，当你审视(look at)自己的人生时，不要后悔没有走的路。
35．选D　根据该句中的“Instead”可知，下文与上文构成转折关系，即不要对没有选择的路感到遗憾，而要对当前的路心存喜悦(pleased)。
语篇解读：本文是一篇说明文。文章主要介绍了虚拟技术在商业领域的应用，特别是虚拟镜子如何为顾客提供更好的购物体验，及其在珠宝和化妆品试戴或者试用方面的优势。
36．popularity　考查名词。空处在句中作动词gain的宾语，应用名词popularity，意为“普及”，为不可数名词。
37．Recently　考查副词。 空处修饰整个句子，应用副词recently作时间状语；置于句首，首字母应大写。
38．the　考查冠词。此处特指上文中名为Dangle的虚拟镜子所展示的图片，应用定冠词the限定。
39．providing　考查非谓语动词。空处在句中作伴随状语，且provide与其逻辑主语They之间构成主动关系，故用现在分词形式。
40．means　考查时态和主谓一致。空处作主句的谓语，本句陈述客观事实，应用一般现在时；主语是动名词短语Trying on products with it，谓语动词应用单数。
41．which　考查宾语从句。空处引导宾语从句，且从句中缺少宾语，表示“哪一种”，应用连接代词which。
42．on　考查介词。put on makeup是固定短语，意为“化妆”，其中on是介词。
43．their　考查代词。空处修饰名词face，应用形容词性物主代词their。
44．to teach　考查非谓语动词。be designed to do sth.意为“被设计用来做某事”，为固定用法。
45．directions　考查名词复数。此处direction表示“用法说明；操作指南”，常用复数形式，表泛指。
第三部分
第一节
参考范文：
An Unforgettable Tech Exploration Tour
Last weekend I participated in a fabulous tech exploration tour in the City Science Museum organized by our school.
It kicked off with an exhibition of the history of Chinese science, unfolding the awe striking wisdom behind.What followed was a hands on experience, which uncovered the secrets of science.With a lecture on the prospect of science, the tour was brought to an end.Not only did the tour instill me with a sense of pride in our scientific advances, but it also planted in my heart a seed of scientific exploration.
Anybody who shares the same feeling Anticipating your comments!
第二节
参考范文：
One night, Alexa did not turn on the lamp when I gave the command.I tried to say “Turn on the light” to it countless times, but Alexa didn't work.“New technologies are always unreliable，” my husband complained.I searched the Internet and immediately found the reason why Alexa couldn't work.I just needed to tell Alexa to set the light color to white or whatever color I wanted, and then it would turn on the light.Then Alexa turned on the light itself.
We should thank our children and grandchildren.It was our children and grandchildren that taught us to use technology so that I could find a solution on the Internet by myself.Without them, our life is always invariable and boring.Our children and grandchildren “force” us to accept and use technology, which seems to put us under pressure.However, the fact is that our children and grandchildren let us really accept and use technology to make our life more convenient.
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