同济大学数据库课程考核试卷 A卷 秋季数据库期中考试 英语 参考答案
2020年同济大学实验学校高三英语下学期期中试卷及参考答案
2020年同济大学实验学校高三英语下学期期中试卷及参考答案第一部分阅读（共两节，满分40分）第一节（共15小题；每小题2分，满分30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AWhat to Eat—and What to Skip—When It Comes to Takeout FoodIf the burden on your wallet doesn't bother you much, the effect your takeout habit can have on your waistline just might arouse your attention. Here's the best and worst of the lot for your belly.Steamed Vegetable Dumplings: Order This.When she orders Chinese, registered dietitian nutritionist Elisa Zied gets an order of steamed vegetable dumplings. "I often pair them with either chicken and broccoli in brown sauce（I ask for a little saucemade without sugar）or steamed shrimp dumplings," she tells us.Crab Wontons: Not That!When you deconstruct crab wontons, it's easy to see why they're a "Not That!" The inside is filled with crabmeat and cream cheese（which is just a fancy, spreadable fat）.The wonton is made of refined flour, egg and salt and the crispy（脆的）coating is a result of a deep oil bath.Peking Duck: Order This.Most of the fat from the skin flows out of the duck over the course of cooking, making this a healthier choice than most of the stir-fry dishes available. Order a side of steamed vegetables and serve it with a small scoop of brown rice. Done and done!Sweet and Sour Anything: Not That!Anything with “sweet and sour” in its title is a powerful cue that something has been deep-fried and covered in a sickly-sweet pink sauce. If you pair your selection with a side of rice, you're looking at a 1,000-calorie meal.Summer Roll: Order This.Summer rolls are steamed instead of fried—and typically filled with lean proteins and vegetables, making them a winning appetizer in our book. Pair them with an order of edamame（毛豆）and a broth-based soup for a satisfying, filling meal.Spring Roll: Not That!Spring=deep-fried, which is why we say to skip them! They're filled with fat and calories your belly doesn't need.1.What kind of cooking method should be skipped according to the text?A.Steaming.B.Stir-frying.C.Deep-frying.D.Boiling.2.Which of the following suits as a good starter for a meal?A.Chicken and broccoli.B.Steamed vegetable dumplings.C.Peking duck.D.Summer rolls.3.Where can the text be found?A.In a recipe.B.In a guidebook.C.In a science fiction.D.In a health magazine.BThe outbreak of the novel corona virus pneumonia (NCP) has disrupted the lives and work of nearly every Chinese person. However, a new trend has been on the rise: many have turned themselves into livestreaming users orfollowers.According to Questmobile, a professional big data intelligence services provider in China, the audience for Douyin, Kuaishou and other livestreaming platforms surged to 574 million during the Spring Festival holiday, up 35 percent from 2019.Confined at home, away from their friends and loved ones, people turn to livestreaming to reach out to the world. For them livestreaming can help them share their lives and interest with a global audience, which will give them the sense of being “in the moment”. Even as viewers, they can also engage immediately with livestreamers by commenting and making suggestions.“When I comment on the livestreaming videos, I’m not simply an audience member, but also an active part of the program. That gives me a sense of engagement,” an Internet user named Wang Hao told People’s Daily.Livestreaming is not only for fun, but also a new tool for many businesses. Affected by the pandemic, many businesses had to stop their sales in physical stores. To meet their business goals and survive during these trying times, many chose to livestream to revive their businesses.Joyoung, a leading maker of small kitchen appliances, is a good example. The company not only added a number of broadcasts each day to advertise their products, but also shared the menus that were beneficial to health. “The responses to our livestreaming shows have been well beyond expectations,” Kang Li, who oversees the company’s livestreaming unit, told China daily. “It’s a natural opportunity to truly bond with our followers.”Like it or not, livestreaming is likely to go mainstream in China for both entertainment and business.4. What is the purpose of writing the second paragraph?A. To introduce some popular livestreaming platforms in China.B. To report data on the development of livestreaming in 2019.C. To show that Chinese people spend too much time on livestreaming apps.D. To prove that livestreaming are becoming increasingly popular in China.5. What does Wang Hao think of commenting on livestreaming?A. It is boring to make comments.B. It is the only way to share viewers’ lives.C. It makes people feel involved in the stream.D. It helps livestreamers improve themselves.6. What do paragraphs 5&6 mainly talk about?A. Livestreaming replaced physical stores in many areas.B. Many businesses turned to livestreaming platform for marketing.C. Livestreaming platforms faced challenges during the pandemic.D. Livestreaming platforms made changes to their services.7. How does the author feel about thefuture of livestreaming？A. Positive.B. Uncertain.C. Disappointed.D. Confused.CFirst grader Gavin Clampett was diagnosed(诊断) with Tourette’s Syndrome at the age of five. Due to the neurological(神经的) disorder, he always experiences a variety of sudden uncontrolled movements and sounds.The uncontrollable actions mean that he often gets dirty looks from strangers in public and kids make cruel comments on the school bus and in class. In an effort to prevent the unkind comments, Gavin’s mother, 32yearold Rebecca Clampett helped him make a video with his sister Brynn, nine, and played it to pupils at his school to help them understand the condition.In the video, which Rebecca also shared on YouTube, Gavin’s sister Brynn starts by answering the question “What is Tourette’s Syndrome?” She explains, “It is a neurological disorder, which means it affects the brain so that a person makes unwanted movements. These are called tics(抽搐), but not like a tic that is found outside. These tics can be very noticeable or not very noticeable, quiet or loud.”School can be hard for all kids. That canbe even harder for children like Gavin because they have to facepeople who laugh at them every single day. “I feel like my brother and every other kid who has Tourette’s Syndrome are brave. So be kind to them and don’t treat them differently because they are just like you”, Brynn says in the video.Gavin concludes, “Everyone could play with someone. Some people think I can’t because I’m different but actually I can. Some are afraid that I will say dirty words, but actually I won’t. The disease bothers me a little, but I’m OK.”8. What can we know about Tourette’s Syndrome?A. It can be treated with drugs.B. It is usually found at an early age.C. People with it will say dirty words.D. People with it can make uncontrolled sounds.9. Because of the disease, others often _________.A. take pity on GavinB. give a hand to GavinC. keep away from GavinD. look down upon Gavin10. In the video, Gavin’s sister __________.A. explains her brother’s diseaseB. expresses her love for her brotherC. complains about unkind commentsD. encourages others to donate money11. What can be used to best describe Gavin?A. Lucky.B. Helpless.C. Optimistic.D. Stubborn.DWhen Chip heard the mail truck arriving on his sixth birthday, herushed out—not knowing that he’d come back with a treasure.Outside the house, which was decorated with birthday balloons, postwoman Shelley held a pile of boxes. One was marked with Chip’s name and a greeting for his Special day, November 5.“So,” when he came running out the door, she said, “You must be Chip!” And he said,“Yes.” She said, “Today’s your birthday?” And he started smiling. Shelley said, “So, let me see if I can find you something for your birthday.”She checked her pocket and surprised him with a gift: a dollar bill and four quarters.On this day, the 42-year-old postwoman made one little boy very happy. “He was very excited,” said his mom, Bonnie. “He came running back in the house just waving his money.” Chip is saving up to buy a Spider-man action figure.“Our family has had money problems since I lost my job. Gestures like that are valuable memories.” Her hope is that Chip and his eight-year-old sister, Bennett, will remember this when they grow up. “Not the ugly that is out there right now, but the good and the kind and the giving.”A photo of a smiling Chip and Shelley next to the mail truck has been shared widely on social media. Shelley said she was just trying to give back, because people are often nice to her eight-year-old son, Joshua.On a recent day, Chip heard the mail truck and rushed out again, this time to deliver an envelope with a thank-you card for his favorite mail carrier. Since that day, the families have kept in contact. Shelley has struggled to find someone who can take care of her son, and Bonnie has agreed to watch him at her home while his mom is on her mail route.12. Why did Chip rush out when he heard the mail truck the first time?A. To thank the postwoman.B. To get a gift box mailed to him.C. To receive birthday wishes from the driver.D. To watch the mail truck.13. What did Shelley do to make Chip happy?A. She gave him some pocket money.B. She sent him some birthday balloons.C. She presented him with a greeting card.D. She bought him a Spider-man action figure.14. What is Chip’s mother’s attitude towards Shelley?A. Grateful.B. Curious.C. Doubtful.D. Indifferent.15. What does Chip’s mother do to help Shelley?A. She offers to deliver the mails for her.B. She often helps drive her mail truck.C. She looks after her son when she is at work.D. She posts pictures of her mail truck on social media.第二节（共5小题；每小题2分，满分10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。
2020-2021学年同济大学实验学校高三英语期中考试试卷及参考答案
2020-2021学年同济大学实验学校高三英语期中考试试卷及参考答案第一部分阅读（共两节，满分40分）第一节（共15小题；每小题2分，满分30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AUNUSUAL ATTRACTIONS ON THE WATERBangkokFloating MarketsThere are many floating markets where goods are sold from boats. While modem markets are more popular, floating markets still are huge attractions for local tourism. In Bangkok Floating Markets,Thailand, one of the most popular ones, any visitors can buy local foods and traditional hand-made souvenirs.Bregenzer Festspiele（Opera festival）The Bregenz Festival is held every year from July to August inVorarlberg,Austria. It has the world's largest stage on the water. The performances are different every year but they are usually united by one theme. The decorations（装饰）are very impressive and are worth seeing.Viva, ArtificialIslandArtificial islands are not something new. What makes this island special is that . it is floating. Viva is the largest out of three man-made islands along with Vista and Tera, all situated inSeoul,South Korea. The island weighs 2,000-tons and is technically a buoy（浮标）.The island unfortunately is not carbon-neutral（碳中和）but it has solar panels which can generate electricity to power the hall, restaurants and shopping malls. MarinaBayFloating Platform StadiumThis stadium was built as a temporary solution while Singapore National Stadium was rebuilt. Now it is usedfor different sporting events, concerts, and festivals. In particular, it was once used for the opening and closing ceremonies during the 2010 Summer Youth Olympics.1. What can visitors do at Bangkok Floating Markets?A. Performing.B.Boating.C. Shopping.D. Swimming.2. What do you know about Viva?A. It is the biggest island inSouth Korea.B. It has the equipment to harness solar energy.C. It is the largest floating stage on the water.D. It is a man-made island only for low-carbon life.3. Which attraction should you choose to watch a basketball match?A. Bangkok Floating Markets.B. Bregenzer Festspiele.C. Viva, ArtificialIsland.D.MarinaBayFloating Platform Stadium.BSince I was born and brought up in a rural town, I have a great interest in nature. Using the chance of studying abroad in my second year at college, I decided to go toCanadajust because I wanted to see the beautiful phenomena there So after I finished the study program, I went toYellowknifein theNorthwest Territories.I clearly remember the sixth night inYellowknife. Suddenly my host mother came to my room around 8 p.m. and told me to change clothes and go outside quickly carrying her camera.The northern lights were flickering (闪烁) in the sky! I was shocked and just stood there with my mouth open.I forgot to take pictures of the mysterious lights.Since that night, whenever it was sunny, I went outside at night and looked at the sky. It was so cold that I lost all feeling in myhands and feet.As I took pictures of the northern lights, I came to find a characteristic movement of the lights. They first appear in the north part of the sky and then they gradually come down to the south part of the sky. After that, suddenly, they come in the middle of the north and south only for a while, which is the time when the best northern lights can be seen. Since it is only a few seconds for the northern lights to come down to the middle of the sky, it is very hard to get good pictures.The stronger the sun acts, the better and stronger the northern lights flicker in the sky. That’s because they come about from the collisions (碰撞) between atmospheric gases and the solar wind. Much more solar wind comes to the earth when the sun is active, whichleads to the best northern lights. And the color1 s of the northern lights depend on the height of the collisions and the kinds of gases.4. Why did the host mother ask the author to go out?A. She wanted to take a picture of him.B. She wanted to take a walk with him.C. She wanted to tell him something important.D. She wanted him to see the northern lights.5. The author forgot to take pictures after going out because ______.A. the host mother didn’t remind him to take the cameraB. he was shocked by the wonderful sightC. the lights flickering in the sky disappeared too soonD. he lost all feeling in his hands and feet6. When is the best time to see the northern lights?A. When they appear in the north part of the sky.B. When they come down to the south part of the sky.C. When they are between the north and south.D. When they rise in the east part of the sky.7. What does the last paragraph mainly tell us?A. Waysto take good pictures.B. The relationship between the sun and the northern lights.C.The color1 s of the northern lights.D. The time of the best northern lights.CWho is a genius? This question has greatly interested humankind for centuries.Let's state clearly: Einstein was a genius. His face is almost the international symbol for genius. But we want to go beyond one man and explore the nature of genius itself. Why is it that some people are so much more intelligent or creative than the rest of us? And who are they?In the sciences and arts, those praised as geniuses were most often white men, of European origin. Perhaps this is not a surprise. It's said that history is written by the victors, and those victors set the standards for admission to the genius club. When contributions were made by geniuses outside the club—women, or people of a different color1 or belief—they were unacknowledged and rejected by others.A study recently published bySciencefound that as young as age six, girls are less likely than boys to say that members of their gender(性别)are “really, really smart.” Even worse, the study found that girls act on that belief: Around age six they start to avoid activities said to be for children who are “really, really smart.” Can our planet afford to have any great thinkers become discouraged and give up? It doesn't take a genius to know the answer: ly not.Here's the good news. In a wired world with constant global communication, we're all positioned to seeflashes of genius wherever they appear. And the more we look, the more we will see that social factors(因素)like gender, race, and class do not determine the appearance of genius. As a writer says, future geniuses come from those with “intelligence, creativity, perseverance(毅力), and simple good fortune, who are able to change the world.”8. Whatdoes the author think of victors' standards for joining the genius club?A. They're unfair.B. They're conservative.C. They're objective.D. They're strict.9. What can we infer about girls from the study inScience?A. They think themselves smart.B. They look up to great thinkers.C. They see gender differences earlier than boys.D. They are likely to be influenced by social beliefs10. Why are more geniuses known to the public?A. Improved global communication.B. Less discrimination against women.C.Acceptance of victors' concepts.D. Changes in people's social positions.11. What is the best title for the text?A. Geniuses Think AlikeB. Genius Takes Many FormsC. Genius and IntelligenceD. Genius and LuckDAs an eco-minimalist, Su Yige has maintained an environmentally friendly and sustainable lifestyle for the past three years while studying in Canada. She takes her own bag when she goes grocery shopping and uses second-hand items as often as possible. She avoids almost all paper-related products unless she has to use a public toilet while away from home.Diligence and thrift are time-honored traditional Chinese virtues. Su's family is a good example of this, according to the native of Weihai, Shandong province. Although they have little formal “green” knowledge, her parents lead a very environmentally friendly life.For example, the family has used the same hair dryer for more than a decade, and Su remembers many of her mother's clothes from as far back as kindergarten. “As long as something can still be used, my mother will notreplace it with a new item,” she said.“I frequently asked my father to bring the plastic bag back home after dumping our waste in the trash bin. He was unhappy, and argued that instead of making that request, I should go downstairs to dump the waste myself” she said. In another move, her father criticized her for doing too much shopping online. Eventually, they both made steps toward becoming better environmentalists. Her father brings the bag back for reuse and she has only bought two pieces of clothing online in the past six months.Back in Canada, Su is looking forward to finding a job related to sustainable development in China after she graduates as a computer science major in the summer.12. Which of the following best describes Su Yige?A. Conservative.B. Nostalgic.C. Economical.D. Productive.13. What can be found about Su's mother according to the third paragraph?A. She has a lot of formal green knowledge.B. She regards using the same items as a lifestyle.C. She always wears old clothes due to lack of money.D. She will not replace the old items until they are out of style.14. What can be inferred about Su and her father?A. Both of them like to criticize each other.B. Su's father is particular about her clothes.C. The relationship between them is very tense.D. They urge each other to become more environmentally friendly.15. What can we learn about the author soon after she graduates in Canada?A. She will stay there to look for a job.B. She will put effort into computer science.C. She will devote herself to her motherland's future.D. She will come back to China to stay with her parents.第二节（共5小题；每小题2分，满分10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。
2021届同济大学实验学校高三英语下学期期中试卷及参考答案
2021届同济大学实验学校高三英语下学期期中试卷及参考答案第一部分阅读（共两节，满分40分）第一节（共15小题；每小题2分，满分30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AChina has 410K5Gbase stationsChina built 257,000 new 5G base stations in the first half of the year, according to the Ministry of Industry and Information Technology (MIIT).Shipments of 5G phones reached 8623 million unis in China, with 5G package users hitting 66 million by the end of June, said Wen Ku, head of information and communication at the ministry.To give full play to the commercialization of 5G, more policies should be implemented to boost the vitality of the market, Wen said, adding that international cooperation in 5G technology, industry and application should be strengthened.AG600 seaplane’s test flightKunlong, China’s homegrown AG600 large amphibious aircraft, conducted its first sea-based test flight on Sunday morning, marking a new milestone in the program.The AG600 is China’s second amphibious aircraft, after the SH-5, which was developed in the 1970s for military purposes and has been retired for a long time.These specifications make it the world’s biggest amphibious aircraft, surpassing Japan’s ShinMaywa US-2 and Russia’s Beriev Be-200.Once in service, it will put an end to the absence of a large rescue aircraft in China and will be very useful in the national emergency rescue and disaster relief systems.Beidou products land abroadAccording to Ran Chengqi, director general of China Satellite Navigation Office, Beidou has been constantly deepening its compatibility, interoperability and cooperation with the US’ GPS, Russia’s GLONASS and the EU’s Galileo. It has also entered international organizations of civil aviation, maritime affairs, search and rescue satellites and mobile communication.BDS-based services have been successfully applied in land mapping, precision farming, digital development and smart port construction in member countries of ASEAN, South Asia, Eastern Europe, West Asia and Africa.1. What can we learn from this passage?A. The total number of 5G phones has reached a new level.B. Kunlong, unlike SH-5, is not just for military purposes.C. Technologies mentioned above need more cooperation with others.D. BDS-based services have been provided for users in many countries.2. Which of the following is most probably related to agriculture?A. 5G phonesB. BDS-based servicesC. AG600 seaplaneD. Beriev Be-2003. If your friend did a course in marketing management, he may choose a job in a ________.A. 5G technology related marketB. large amphibious aircraftC. BDS-based projectD. China Satellite Navigation OfficeBBabies who frequently communicate with their caregivers using eye contact and vocalisations(发声)at the age of one are more likely to develop greater languages skills by the time they reachtwo,according to new research.In the study, researchers looked at 11-and 12-month-od babies' vocalisations. gestures and gaze behaviours ,and at how their caregivers responded to them.To measure he interactions ,the researchers videoed infants(婴儿)and caregiver at home,and asked them to play as usual.They took those recordings back to the universityThe scientists then used statistical models to find that the best predictor of vocabulary at 24 months was when infants were seen to use vocalsatioms while looking at their caregiver's face when they were about a year old.The benefits were even greater when these interactions were followed by responses from the caregiver.The statistics showed that at 19 months,children had an average of about 100 words.Those who exhibited the beneficial interactive behaviour earlier in life were seen to have an average of about 30 extra words."The message of this paper is thatitis the result of a joint effort; noticing what your child is attending to and talking to them about it will support their language development." said McGillion, a co-author of the work."The joy of this message is that that can happen in any context... across any part of your day.It's not something that requires special equipment or even lots of time.I can happen when you're doing the laundry,for example—when you're taking out the socks, you can talk about socks...in the park, in the car, at mealtimes,at bathtimes.This finding can be used in any context,"added McGillion."This is a developmental snapshot in the first year of life, but children are constantly growing and changingand so are their behaviours. It would be interesting to look at these sorts of behaviours again as children progress through the second year of life to see what's happening there,"said Donnellan,the lead author on the study.4. How did the researchers get the findings?A. By interacting with babies.B. By asking babies to vocalize.C. By analyzing relevant recordings.D. By referring to the previous statistics.5. What does he underlined word "it"in Paragraph 5 mean?A. Infants' eye contact.B. Infants' larger vocabulary.C. The response from caregivers.D. The best predictor of vocabulary.6. What did McGilion say about infants' interactive behaviour?A. I's easy to perform.B. It's complex to understand.C. It's difficult to copy.D. It's interesting to video.7. What might further studies be on?A. Children's academic progress.B. Children's growing environment.C. Children's potential physical development.D. Children's behaviours across more age ranges.CI was so worried about handing my little boy over during his first week of school, but you made it easier. You smiled at him like a mother would at her own child.You showed warmth and your hugs were always on offer.After a day in class with you, Charlie would come home singing. Whenever I hear Do Your Ears Hang Low or see him stretching to the sky when singing about the days of the week, I will think of you.I didn't tell you at the time, but I loved your morning song so much that Iimplementedit in my own class (I'm a teacher, too).When you saw I was troubled, you hugged me with your smile and I knew everything would be OK. You made parents feel as cared for as our children.In the short time I knew you; you taught me about the type of teacher Idesire to be. You never seemed disturbed by the mountain of paperwork or impossible work-life balance that comes with the role. Instead, you appeared to embrace every minute.I can't understand why you've been taken from us. Telling Charlie was one of the hardest things I've had to do.I'm not sure he fully understands, but he told me he loved you and has been asking whether your"robot powers"will work in heaven.A friend once told me white feathers are angels telling us that loved ones in heaven are well. On the first day collecting the children without you，a white feather floated through the sleet (雨夹雪). Watching the younger ones bounce and gigle as they tried to catch it was beautiful.I wish I had told you all of this when you were with us.I hope that you knew how you brought happiness to everyone you met and how loved you were. Goodbye, Dear Friend.8. What does the underlined word "implemented" in Paragraph l probably mean?A. Looked back on.B. Looked forward to.C. Thought highly of.D. Made use of.9. What can we learn from the passage about parents?A. They need to sing songs before children.B. They need to feel the affection as well.C. They find it hard to handle their kids.D. They find it necessary to hug the teachers.10. The writer mentioned "white feather" in Paragraph 4 mainly to ______.rm us of the loved one's deathB. remind us it's time for a snowball fightC. tell us the teacher stays in our mind after deathD. warn us of the falling snow when collecting children11. What's the writer's main purpose in writing this article?A. To make a remark on Charlie's teacher.B.To say goodbye to her fellow teacher.C. To take pity on her fellow teacher.D. To recall and show respect for Charlie's teacher.D“We are running out of space and the only places to go to are other worlds... Spreading out may be the onlything that saves us from ourselves. I am convinced that humans need to leave Earth.” These are the words of the famous scientist Stephen Hawking, spoken at a science festival inNorwayin 2017, a year before his death.Hawking was not alone in this view. Many experts feel that the only way for humanity to last far into the future is to colonize other planets. That way, if an asteroid, a terrible disease, nuclear war, or some other disaster strikes Earth, civilization as we know it would still have a chance. Mars is one of the most tempting destinations. NASA, theUnited Arab Emirates, the private company SpaceX, and the organization Mars One all have plans to send humans there. “Either we spread Earth to other planets, or we risk going extinct, SpaceX founder Elon Musk said at a conference in 2013.But not everyone agrees that colonizing Mars or any other planet is such a great plan. The most common argument against going is that it’s just too expensive or dangerous. It will take huge amounts of money and other resources just to get people there, let alone set up a place for them to live. It’s not even clear if humans could survive on Mars. One of the biggest dangers there is deadly radiation that bombards the planet.Maybe all the time and money people would pour into a Mars mission would be better spent on more urgent projects here on Earth, like dealing with poverty or climate change. Some experts argue that handling a problem like an asteroid strike or disease outbreak while staying here on Earth would be much easier and less expensive than surviving on a new planet.In addition, moving to a new planet could harm or destroy anything that already lives there. Mars seems uninhabited, but it could possibly host microbial life. Human visitors may destroy this life or permanently change or damage the Martian environment. Some feel that’s too much of a risk to take.What do you think? Should humans colonize outer space or stay home?12. What can be inferred from the passage?A. Many experts insist that humans should take the risk.B. Mars is the most attractive destinations for human beings.C. Hawking firmly believes the only way to save humans is moving to Mars.D. All the other experts don’t agree with Hawking’s idea.13. Why do some experts disagree with the plan to colonize Mars?A. It will cost much more money to settle on Mars than on Earth.B. It is too long a distance from the Earth to the Mars.C. Human visitors will bring diseases to Martian environment.D. The deadly radiation that bombards the planet is the biggest danger.14. What’s the writing purpose of the passage?A. To raise people’s awareness of protecting the environment.B. To present different opinions on whether to move to the Mars.C. To arouse readers’ reflection on whether to colonize outer space.D. To inspire people to deal with the environmental problems.15. In which section of a magazine is the passage most likely from?A. Fiction.B. Current affairs.C. Social Studies.D. Science.第二节（共5小题；每小题2分，满分10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。
A4纸版-同济大学课程期中考核试卷(A卷)-2012年春数据库-答案
同济大学课程期中考核试卷2012 —2013 学年第一学期课号：10014503, 10014502 课名：数据库系统原理考试考查：考试此卷选为：期中考试( )、期终考试( )、重考( )试卷年级专业学号姓名得分一、选择题（每题2分，共10分，请将正确选项填入每题前面的括号中）（ C ）1．数据库中存储的是。
A．数据 B．数据模型 C．数据以及数据之间的联系 D．信息（ C ）2. 数据库中，数据的物理独立性是指。
A．数据库与数据库管理系统的相互独立 B．用户程序与DBMS的相互独立C．用户的应用程序与存储在磁盘上数据库中的数据是相互独立的D．应用程序与数据库中数据的逻辑结构相互独立（ D ）3. 数据库的三级模式结构中，描述数据库中全体数据的全局逻辑结构和特征的是：A．外模式B．内模式C．存储模式D．模式（ C ）4.在关系代数运算中，五种基本运算为。
A．并、差、选择、投影、自然连接 B．并、差、交、选择、投影C．并、差、选择、投影、乘积D．并、差、交、选择、乘积（ D ）5. 在关系DB中，任何二元关系模式的最高范式必定是。
A．1NF B．2NF C．3NF D．BCNF二、填空题（每空2分，共20分）1．数据模型是由数据结构、数据操作和完整性约束三部分组成的。
2.数据库系统的三级模式结构按照模式、外模式和内模式三级结构进行组织。
3. 关系数据库中基于数学上两类运算是关系代数和关系演算。
4. 数据库的二级映像为外模式/模式映像和模式/内模式映像。
三、设计题（每小题5分，共15分）1.假设教学管理规定：①一个学生可选修多门课，一门课有若干学生选修；②一个教师可讲授多门课，一门课只有一个教师讲授；③一个学生选修一门课，仅有一个成绩。
学生的属性有学号、学生姓名；教师的属性有教师编号，教师姓名；课程的属性有课程号、课程名。
要求：根据上述语义画出ER图，要求在图中画出实体的属性并注明联系的类型；2. 已知学生关系模式S(Sno，Sname，SD，Sdname，Course，Grade)其中：Sno学号、Sname姓名、SD系名、Sdname系主任名、Course课程、Grade 成绩。
2020-2021学年同济大学实验学校高三英语期中试卷及答案
2020-2021学年同济大学实验学校高三英语期中试卷及答案第一部分阅读（共两节，满分40分）第一节（共15小题；每小题2分，满分30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ANo one knows when the first printing press was invented or who invented it. but the oldest known printed text originated in China during the first millennium (千年) AD.The Diamond Sutra (《金刚经》), a Buddhist book from Dunhuang, China during the Tang Dynasty, is said to be the oldest known printed book.The Diamond Sutrawas created with a method known as block printing (雕版印刷), which used boards of hand-carved wood blocks in reverse.It was said that the moveable type was developed by Bi Sheng. He was fromYingshan,Hubei,China, living from 970 to 1051 AD. His method replaced panels of printing blocks with moveable individual Chinese characters that could be reused. The first moveable Chinese Characters were carved into clay and baked into hard blocks that were then arranged onto an iron frame that was pressed against an iron plate.The earliest mention of Bi Sheng’s printing press is in the bookDream Pool Essays, written in 1086 by Shen Kuo, who noted that his nephews came into possession of Bi Sheng’s typefaces (字体) after his death. Shen Kuo explained that Bi Sheng did not use wood because the texture is inconsistent (不一致的) and absorbs wetness too easily.By the time of the Southern Song Dynasty, which ruled from 1127 to 1279 AD, books had become popular in society and helped create a scholarly class of citizens who had the capabilities to become civil servants. Large printed book collections also became a status symbol for the wealthy class.1. When was Bi Sheng’s printing press first introduced in history?A. After Bi Sheng died and his nephews owned his typefaces.B. When books became popular in the Southern Song Dynasty.C. After the block printing was replaced by the moveable type printing.D. WhenThe Diamond Sutrawas printed into a book.2. What can we infer from the passage?A. Shen Kuo made great contributions to printing.B. The moveable type printing was invented earlier than block printing.C. Printed books were hard to get in the Song Dynasty.D. By the Southern Song Dynasty, books had helped people get to higher social positions.3. Why does the author write this passage?A. To show that Buddhism was popular in the Tang Dynasty.B. To introduce the early history of printing.C. To memorize Bi Sheng, developing the moveable type printing.D. To indicate the advantages of moveable type printing.BOnce a rich and clever boy had practically everything a boy could want, so he was not interested in most toys. But he couldn't get a very old mirror, and heconvinced his parents to buy it from mysterious（神秘的）old man. When the mirror arrived home, the boy went to see his reflection in it. His face looked very sad indeed. He tried smiling and making funny faces, but his reflection continued with its sad expression. "What a terrible mirror! It's the first time I've seen a mirror that didn't work properly!" the boy jumped violently.That same afternoon he went into the street to play and bought a few toys, but on his way to the park he saw a little girl who was crying her heart out. The girl was crying so much and looked so lonely that the rich boy went over to help her and to see what had happened. The little girl told him that she had lost her parents.Together the two set off in search of the parents. As the little girl wouldn't stop crying, the boy spent his money buying her sweets to cheer her up. Finally, after much walking, they found her parents who were much worried and were looking for her everywhere.The rich boy said goodbye to them. As it was getting late, he decided to head for home, without being able to play. At home, he went to his room, and noticed a shining light in the corner, the same corner he had left the mirror in. Seeing this, he went over to the mirror, and realised that the light was coming from his own body, so radiant（闪亮的）with happiness he had become.And so he understood the mystery of that mirror, the only mirror which could faithfully reflect the true joy of its owner. He realised it was true. He felt very happy at having helped that little girl. And since then, each morning when he looked in that mirror and failed to see a special shine, he knew what he had to do to bring it back.4. How did the boy feel when he first looked into the mirror?A. Embarrassed.B. Angry.C. Worried.D. Delighted.5. Why was the little girl crying so hard?A. She couldn't find her parents.B. She couldn't get the mysterious mirror.C. Her parents couldn't buy toys for her.D. The boy refused to give his toys to her.6. What could the boy see in the mirror after he went back from the park?A. A shining toy.B. A broken mirror.C. His happy face.D. The lovely girl.7. What is the purpose of this text?A. To tell us a horrible story.B. To introduce to us a strange mirror.C. To warn us not to be selfish.D. To encourage us to help others.CIf there is no difference in general intelligence between boys and girls, what can explain girls’ poor performance in science and math?It hasbeen suggested that girls do not take math courses, not because they are difficult, but for social reasons. Girls do not want to be in open competition with boys because they are afraid to appear less feminine (女性的) and attractive (有魅力的).However, there are still more high-achieving boys than girls when taking math exams. This difference appears to be worldwide. Biological explanations have been offered for this, but there are other explanations too.Perhaps the difference which comes out during the teenage years has its roots in much earlier experiences. From their first days in kindergarten, boys are encouraged to work on their own and to complete tasks. Facts show that outstanding mathematicians and scientists have not had teachers who gave answers.Besides, there can be little doubt that teachers of math and science expect their boy students to do better at these subjects than their girl students. They even appear to encourage the difference between boys and girls. They spend more time with the boy students, giving them more time to answer questions and working harder to get correct answers from them. They are more likely to call on boys for answers and to allow them to take the lead in classroom discussion. They also praise boys more frequently. All of this seems to encourage boys to work harder in science and math and to give them confidence that they are able to succeed.Such a way of teaching is not likely to encourage girls to take many math and science courses, nor is it likely to support girls who do. When it comes to these subjects it seems certain that school widens the difference between boys and girls.8. Why does the author raise a question in paragraph 1?A. To find differences between boys and girls.B. To explain the poor performance of girls.C. To ask readers a question.D. To introduce the topic.9. The text mainly discusses ________ reasons for the difference between boys and girls in scientific achievements.A. biologicalB. personalC. socialD. historical10. What does the text say about great mathematicians?A. Their teachers did not offer answers to them.B. They started learning math at an earlier age.C. They showed mathematical abilities in their teenage years.D. Their success resulted from their strong interest in math.11. The author would probably agree that ________.A. boys and girls learn in the same wayB. boys and girls are equal in general intelligenceC. girls are more confident in themselves than beforeD. girls should take fewer science courses than boysDCuckoos don’t bother building their own nests—they just lay eggs that perfectly imitate those of other birds and take over their nests. But other birds are wishing up, evolving some seriously impressive tricks to spot the cuckoo eggs.Cuckoos are often know asparasites, meaning that they hide their eggs in the nest of other species. To avoid detection, the cuckoos have evolved so that eggs seem reproduction of those of their preferred targets. If the host bird doesn’t notice the strange egg in its nest, the little cuckoo will actually take the entire nest for itself after it comes out, taking the other eggs on its back and dropping them out of the nest.To avoid this unpleasant fate for their young, the other birds have evolved a few smart ways to spot the fakes, which we’re only now beginning to fully understand. One of the most amazing finds is that birds have an extra colour-sensitive cell in their eyes, which makes them far more sensitive to ultraviolet wavelengths and allows them to see a far greater range of colours than humans can. This allows cautious birds to detect a fake egg which might be exactly the same to our eyes.Fascinatingly, we’re actually able to observe different bird species at very different points in their evolutionary war with the cuckoos. For instance, some cuckoos lay their eggs in the nests of the redstarts. The blue eggs these cuckoos lay are practically alike to those of the redstarts, and yet they are still sometimes rejected.Compare that with cuckoos who target dunnocks. While those birds lay perfectly blue eggs, their cuckoo invaders just lay white eggs with brown irregular shaped spots. And yet dunnocks barely ever seem to notice the obvious trick.Biologists suspect these more easily fooled species like the dunnocks are on the same evolutionary path as the redstarts, but they have a long way to go until they evolve the same levels of suspicion. What’s remarkable is that the dunnocks fakes are so bad and the redstart ones so good, and yet cuckoos are still more successful with the former than the latter.It speaks to just how thoroughly a species’ behavior can be changed by the pressures of natural selection, or it might just be a bit of strategic cooperation on the part of the dunnocks. Biologists have suggested that these birds are willing to tolerate a parasite every so often because they don’t want to risk accidentally getting rid of one of their own eggs.12. This passage can be most likely found in a ________.A. science surveyB. nature magazineC. zoo advertisementD. travel journal13. What does the underlined word “parasite” in paragraph 2 most probably refer to?A. Animals that work together to raise young.B. Small harmful animals such as worms or mice.C. Animals that can adapt to changing environments.D. Animals which live on or inside other host animals.14. Which of the following is TRUE about the dunnock according to the passage?A. It is colour-blind and therefore cannot identify foreign eggs in the nest.B. It can easily remove cuckoo eggs from the nest because fakes are so bad.C. It is a host bird that is more likely to raise a cuckoo chick than the redstart.D. It is unable to evolve and hence accepts cuckoo eggs that appear in the nest.15. Which of the following can be inferred from the passage?A. Dunnocks may eventually learn to recognise foreign eggs.B. Redstarts seem to be less suspicious compared to dunnocks.C. Cuckoo birds are good at taking responsibility for their own young.D. It is very easy for cuckoos to imitate the colouring of the dunnock’s egg.第二节（共5小题；每小题2分，满分10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。
2020年同济大学实验学校高三英语下学期期中考试试题及参考答案
2020年同济大学实验学校高三英语下学期期中考试试题及参考答案第一部分阅读（共两节，满分40分）第一节（共15小题；每小题2分，满分30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AContact CCA's Special Programs to learn more about our wide range of credit and noncredit opportunities for academic and personal development.Summer ProgramAn exceptional 4-week program for students currently completing their study of high school.Earn 3 college credits!Our setting is CCA's Oakland campus, where studio-focused, college-level courses help you push beyond concepts to portfolio(作品集)－ready pieces. On-campus Housing & Scholarships available!Summer CoursesCCA offers about 35 for-creditdegree courses each summer, scheduled on theSan FranciscoandOaklandcampuses.Undergraduate and graduate students can work with a visiting artist, develop skills and stay on track for graduation by earning credits...all while still allowing time to visit family, work, travel, etc.For information about summer housing, please contact the Office of Residential Life at 510594722 or housing@ ca. edu.Summer StartSummer Start is a six-week program designed specifically for international undergraduate and graduate students. This is a for-credit program; students receive six credits towards their degree. During the program, you must live on CCA'sSan Franciscocampus.Tuition includes six units of discounted graduate college credit, which will include books, field trip expenses and one-on-one tutoring. Housing fees include six weeks at CCA's San Francisco Panoramic Residence.Company-Customized ProgramsCCA's Office of Special Programs can design customized workshops to develop and strengthen employee skills within your company. Customized programs have included:An Ideation Sketching class, for the design team of a national clothing retailer, scheduled Friday afternoons onSan Franciscocampus.Software-specific workshops, for designers from a national paper products and gifts retailer, scheduled in a two-day workshop format during the week on ourOaklandcampus.1.Who would most potentially apply for Summer Program?A.Employees in companies.B.International undergraduate and graduate students.C.High school graduates.D.Undergraduate and graduate students.2.What can students do if they take Summer Courses?A.Go on a field trip.B.Visit famous artists.C.Make some friends.D.Earn some credits.3.What are students required to do if they take Summer Start?A.Live on one of the campuses.B.Pay school fees in advance.C.Read as many books as possible.plete the courses on time.BWhy do you check social media? Is it to keep up with everything that your friends and family are doing? Is it to find new trendy spots to eat?Regardless of the reason, you may find yourself with different degrees of envy or discomfort after a quick look at your phone. Then you might be suffering from a phenomenon known as “Fear of Missing Out (FOMO). ”While the phenomenon of FOMO can be traced back for centuries, it had never been the issue as it is today, causing widespread discussion and research. This rise in checking social media is naturally connected to the increasing leading position that social media holds over our lives. Every time someone opens their WeChat Moments, Facebook, Twitter... etc. , they are bombarded with the highlight reels of other peoples' lives. A sunny beach, delicious-looking food, a super cute kitten-they are all uplifting photos, yet they're very likely to bring about more unhappiness than joy. You see, the first thought to come out of your mind may be “Wow, that's so cool/delicious/cute”, but then it takes a hard U-turn. You're thinking: “I wish I were there” or “my life is so boring compared to his/hers.” The more you see, the more likely you are to have these negative feelings.What's worse is the habit many people have of turning to social media in search of happiness when they are feeling down, not realizing that they are just going to end up in a negative cycle of endless disappointment. Montesquieu once said: “If one only wished to be happy, this could be easily accomplished; but we wish to be happier than other people, and this is always difficult, for we believe others to be happier than they are.”FOMO will go hand in hand with dissatisfaction and envy. Appreciate what you already have, because someone else out there in the world would gladly give everything to be you.4. What is the purpose of the questions in paragraph 1?A. To introduce the topic of the passage.B. To explain the function of FOMO.C. To describe the features of FOMO.D. To give the reasons for checking social media.5. How might people feel seeing other's perfect life through social media?A. Joyful.B. Admiring.C. Comfortable.D. Envious.6. What can we conclude from Montesquieu's words in paragraph 3?A. We could turn to social media for happiness.B. We couldn't realise our dream without hard work.C. We couldn't harvest happiness through comparison.D. We could live better than others by showing ourselves online.7. What is the author's attitude towards FOMO?A. Indifferent.B. Objective.C. Doubtful.D. Hopeful.CSome years ago a young man applied to a large United States optical firm for a job as a lens designer. He apologized for lack of training, but on announcing that he owned two copies of the classic Conrady's Applied Optics and Optical Design, one for his office and a second for his bedside table, he was hired on the spot. Perhaps the story will be repeated some day with Buchdahl's Introduction to Hamiltonian Optics as a similar certificate of qualification.Hamiltonian theory describes with powerful generality the overall properties of optical systems considered as ‘black boxes’, although it does not describe the detailed structure needed to construct the systems and achieve these properties. Buchdahl's book is therefore on the subject of geometrical optics, but it is not about how to design lenses. It is, however a compact comprehensive account of the fundamentals of the theory written with the lens designer's needs very much in mind. Every lens designer worth his salt has at some time in his career attempted to apply the broad concepts of Hamiltonian optics to the solutions of practical problems. Success hasbeen sufficiently rare that the theory, as such, has made little direct contribution to techniques for optical instrument design. The failures have been frustrating because of the obvious fundamental power of the theory and because of its conceptual elegance. The indirect effects have been large, however, both in contributing to an understanding of fundamental principles that govern the overall behavior of optical systems and in pointing the way to other, more practical, theoretical approaches.Buchdahl approaches the subject not only as a capable mathematical physicist, but as one who with a knowledge of practical optics has made a significant contribution to geometrical optical theory. Buchdahl's approach has, over the last decade, had a major impact on modern lens design with computers. Thus, he brings to this exposition of Hamiltonian optics a familiarity with practical optics not usually found in authors on this subject.The author claims his book to be non-mathematical, and indeed it might be so viewed by a professional mathematician. From the point of view of many physicists and engineers, it will appear to be quite mathematical. Moreover, this is a tightly written book. The subject matter is developed with precision, and the author expects the reader, at very point, to be master of the preceding exposition.8. Hamiltonian theory met with failures as a result of ______.A. newer finding related to the wave particle nature of lightB. very complicated concepts too difficult to understand by most lens designersC. too much mathematical detail in the theoryD. not enough practical information offered by the theory to allow for use by lens crafters9. The author of this passage implies that Introduction to Hamiltonian Optics is necessary to ______.A. the students who are major in mathematical geometryB. those who want to grasp the basic principles of optical systemsC. the lens designers who look for instructions on practical designsD. those who are interested in physics10. The article points out that the great benefits of Hamiltonian optics have been found is ______.A. indirect ways of learning mathematicsB. a fundamental power within the theoryC. the conceptual elegance of the theoryD. the practical applications of the theory in finding new approaches to old problems11. This passage is probably excerpted from ______.A. a review of a bookB. a chemistry textbookC. an optician's essayD. a general science textDElonMusk is a symbol of passion, hard work and success. A person may work hard in his life, but when hard work goes along with passion and a new idea, then something is created that astonishes the world. As the founder of big companies like PayPal, SpaceX, and Tesla Motors, Elon Musk is a guide and inspiration for the youth around the world.Elon Musk was born on June 28,1971 inPretoria,South Africa. He was the eldest of three children. His father Errol Musk, a British-born South African, was an engineer. Musk spent his childhood inSouth Africaand at the age of 9, he got his first personal computer. This got Elon interested in programming and he started to learn on his own. At the age of 12, he made his first computer game, Blaster, which earned him $500 when he sold the source code to a magazine.When he was 17, he decided to leave home and had wanted to move to theUnited Statesafter graduating from a secondary school inPretoria. However, he was unable to move to theUnited States. In 1989, Elon Musk moved toCanada, where his mother’s s lived. After obtaining Canadian citizenship, Musk went toMontreal. Due to a lack of money, he found a low-paying job. At the age of 19, he enteredQueensUniversityinKingston,Ontario, studying there for two years. Finally, in 1992, his dream came true—he moved to theUnited States.As a teenager, Musk struggled with depression. But then he realized that the most important thing was presenting himself with the right questions. The day he started doing this, everything started to get easier.Musk thought that a human being had to expand the limits of his consciousness—to ask the right questions and get answers to them; thus he asked the best question of all: what will have the greatest impact on the future of humans? Musk found that these things were the Internet and space exploration.The life of Elon Musk is inspiring. He found success on the Internet, without much formal learning. By reading books and using his willpower and dedication, he reached a level of knowledge that is difficult to imagine. He did not give up until he achieved his dreams. Elon Musk truly stands out among other billionaires because of his leadership abilities, positive attitude, ability to know when to take risks, and belief in futuristic technologies.12. According to the passage, Elon Musk gained knowledge of computer by ________.A. teaching himselfB. learning from his fatherC. taking online coursesD. studying inQueensUniversity13. What made things easier for Elon Musk when he suffered from depression?A. Expanding knowledge by reading books.B. Asking himself the right questions.C. Achieving success on the Internet.D. Designing computer games.14. What can we learn from the passage?A. It’s never too late to learn.B. Youth means limitless possibilities.C. Where there’s a will, there’s a way.D. He who doesn’t advance falls backward.15. Which words can best describe Elon Musk according to the passage?A. Optimistic and generous.B. Ambitious and determined.C. Independent and helpful.D. Adventurous and realistic.第二节（共5小题；每小题2分，满分10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。
同济大学数据库课程考核试卷A卷秋季数据库期中考试英语参考答案
同济⼤学数据库课程考核试卷A卷秋季数据库期中考试英语参考答案同济⼤学课程考核试卷（A卷）2012 —2013 学年第⼀学期课号：10014501 课名：数据库系统原理（双语）考试考查：考试此卷选为：期中考试( )、期终考试( )、重考( ) 试卷年级专业学号姓名得分Ⅰ. Multiple choice (20 marks, 2 marks each)（C ）1. Five basic relational algebra operations are , others can be derived from these operations.A. ?，-，π，σ，?B. ?，-，π，σ，C. ?，-，π，σ，?D. ?，÷，π，σ，（ABD）2. The following aggregation function(s) will neglect null value. A. SUM B. MAXC. COUNTD. A VG（A. ）3. Given R, U={A,B,C}, F={B→C}, a decomposition of R is ρ={AB, BC}, and the decomposition is:A. lossless-join, dependency preservingB. lossless-join, not dependency preservingC. lossy-join, dependency preservingD. lossy-join, not dependency preserving（BD ）4. When we generate relational schemas from an E-R diagram, the rules for relationship sets are:A. for a binary 1: n relationship set, translate it into a relation, and the primary key of the relationship set is the primary key of the “1” side entity set;B. for a binary 1: n relationship set, translate it into a relation, and the primary key of the relationship set is the primary key of the “n” side entity set;C. a binary 1: n relationship set can be united with the “1”side entity set, and translated into one relation;D. a binary 1: n relationship set can be united with the “n”side entity set, and translated into one relation;（ABC）5. If R∈BCNF, then:A. non-attributes are entirely functional dependent on non-key attributes;B. all key attributes are entirely functional dependent on each candidate key that does not contain them;C. all partial dependencies and transitive dependencies are removed for anyattributes;D. all anomalies are removed within any dependency scope.（AD）6. For PRIMARY KEY definition in CREATE TABLE, when a user wants to insert a tuple into the table, the RDBMS will:A. check for the primary key value, and deny the insertion if it is not unique;B. check for all attributes, and deny the insertion if there is one null value;C. check for all candidate key attributes, and deny the insertion if there is one null value;D. check for all primary key attributes, and deny the insertion if there is one null value（B. ）7. Transforming ER diagram into relational data model belongs to the step ofA. Requirement analysisC. Conceptual design（ABD）8. When dealing with null value in SQL statements, the following correct is(are) .A. AGE IS NULLB. AGE IS NOT NULLC. AGE = NULLD. NOT (AGE IS NULL)（C ）9. The global constraints in SQL statements are check clause based on tuples and .A. NOT NULL constraintB. Domain constraintC. AssertionD. Foreign Key clause（ACDE）10. A DBA’s duties are:A. database restoration and recovery;B. transaction processing and concurrency control;C. security and integrity control;D. performance monitoring, analyzing, and tuning;E. database reforming and restructuring.Ⅱ. Analysis (12 marks, 6 marks each)Are the following E/R diagrams good designs? Justify your answer and try to give better designs if they exist. If you feel they work well under some requirements but not under others, give specific examples. To simplify, keys are not underlined in the diagrams.a.Below is an E/R diagram for companies and employees. One constraint forthe E/R diagram below is that each employee can work in only onecompany.Solution:By making “manager” an attribute, the diagram maintains the one-to-one relationship. However, it does not guarantee that the manager is one of the employees.b.Below is an E/R diagram for a company database involving projects,departments, and employees. Each project can be sponsored by severaldepartments and monitored by several employees in the company. Eachdepartment can sponsor several projects. Each employee can monitor severalprojects and may work in several departments. An employee can monitor aproject that is not in his department.Solution:In this case a trade-off needs to be made between binary relationship and ternary relationship. The same information can be modeled more naturally using the E/R diagram as below. It’s not a good idea to blend the concept of “sponsor” and “monitor”together. Also, in the original diagram, we lost the information of which employee works in which company.Solution:Ⅲ. Relational Database Design and Query (50 marks)1.Assume four relations P, Q, R, and S containing the following tuples, respectively.Give out the results of the following expressions. (6 marks, 2 marks for each)P: A B C D Q: B C E R: B C E S: C Da b c d b d e d c a c d a b e f b c f b d e e f b c e f d c a b c e b d c d d e b b d e fa. P ? Qb. P ÷Sc. σ1=5(Q ×S) a.b.c.2. Consider a relation schema R, where U={A,B,C,D,E,G}, and the set of functional dependencies F={AB →C, C →A, BC →D, ACD →B, D →EG , BE →C, CG →BD, CE →AG}. (6 marks, 3 marks for each)a. Compute the attribute closure +F AB )(.b. Find a minimal cover for F.a. +F AB )( = ABCDEG b. A minimal cover for F is:{AB →C, C →A, BC →D, CD →B, D →E, D →G , BE →C, CG →D, CE →G}3. Consider the relation schema R, where U={A,B,C,D}, and F={A →B, C →A, C →D, D →B, B →C}. Suppose that ρ={R 1, R 2, R 3} is a decomposition of R, where R 1={A, B}, R 2={B, C}, and R 3={C, D}. Is the decomposition ρ of lossless? (5 marks) The decomposition ρ of is lossless.4.Given the relational schema R, U={A,B,C,D,E }, F={AC→BD, B→C,C→D, B→E};/doc/16d147d96ad97f192279168884868762cbaebbca.html e Armstrong axioms and related rules to proof the functional dependencyAC→E; (3 marks)b.Find a canonical cover Fc of F, and find all candidate keys, then point out R isin which normal form; (5 marks)c.Decompose R into 3NF, which the decomposition is lossless-join anddependency preserving. (5 marks)Solution：a. 由AC→BD得AC→B（分解规则）；再由B→E，则有AC→E（传递规则）b. 对R中的函数依赖集F进⾏极⼩化处理，得最⼩依赖集Fm={AC→B, B→C, C→D, B→E}，仍记为F；c. 判定R属于第⼏范式：R的候选码有：AC、AB；主属性为A、B、C；由C→D可见，⾮主属性D对码AC为部分函数依赖，故R?2NF, R∈1NF。
2020届同济大学实验学校高三英语期中考试试卷及答案解析
2020届同济大学实验学校高三英语期中考试试卷及答案解析第一部分阅读（共两节，满分40分）第一节（共15小题；每小题2分，满分30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ABob and Sue Harvey spent nine years as resident fellows in a dormitory at Sanford and in their bookVirtual Reality and The College Freshman, they write “The Freshman oftenfaces an identity problem during the first semester.” College is a more pressured environment than it used to be, in part because the academic gap between high school and college has increased. Many college freshmen have never had to make independent decisions about sex, drugs and alcohol. Most don’t know how to manage their time or money. They often feel lonely and overwhelmed, resulting in anxiety and depression.Nancy Corbin, director of clinical service for student-counseling (咨询) services at Iowa State University, says her office is seeing a significant increase in requests for counseling from freshmen who are having trouble making the adjustment to college life. She says older teenagers increasingly lack the skills to deal with personal problems that aren’t easily defined or fixed. And they get homesick but have a hard time admitting it.Parents and high schools can make things easier on freshmen by preparing them differently. For example, by teaching them to budget their hours and dollars. The Harveys think high schools should offer a college-life course. “Parents need to focus more on relationship and personal issues and less on how many sheets and towels to take,” they say. Many homesick freshmen think they’ll be regarded as failures if they come home before Thanksgiving. So parents can help by letting them know they’re welcome to return if they feel the need. In the meantime, parents have to find new ways to keep in touch with their college kids. One of the best ways is e-mail. It’s less unpleasant and less expensive than constant phone calls and is more likely to be answered than a handwritten letter.1. Why is the first semester difficult for freshmen in college?A. Because they often fail in exams.B. Because they lack time and money.C. Because they are too homesick to make new friends.D. Because they have to settle personal issues on their own.2. In the last paragraph, it is suggested that ________.A. parents should stop buying anything for their kidsB. parents should develop a good relationship with their kidsC. parents should be taught how to send e-mails to their kidsD. parents should work with high schools in college-life courses3. Which of the following might be the best title for the passage?A. Hard Life of College FreshmenB. Approaches to Trouble in CollegeC. Freshmen’s Adaptation ProblemsD. A Strange Phenomenon in CollegeBWhat acts of kindness will make us the happiest, and who tends to benefit the most? A newly-published review of decades of kindness research provides some answers.In this paper, researchers analyzed the results from 126 research articles looking at almost 200, 000 participants from around the world. The studies they chose measured well-being in various ways, including both mental and physical health. Some were experiments, where people did a kindness practice to observe its effects, while others just surveyed people about how kind and happy they were.As expected, people who were kind tended to have higher well-being. Lead researcher Bryant Hui wasastoundedthat the relationship wasn't stronger than it was, but he was still encouraged by the results.One thing Hui and his colleagues found was that people who performed random, informal acts of kindness, like bringing a meal to a sad friend, tended to be happier than people who performed more formal acts of kindness, like volunteering in a soup kitchen.The researchers also found that people who were kind tended to be higher in "eudaimonic happiness"(a sense of meaning and purpose in life) more than "hedonic happiness"(a sense of pleasure and comfort). Perhaps this makes sense, given that being kind takes effort, which reduces comfort but could make people feel better about themselves and their abilities, which would provide a sense of meaning.Being kind came with greater eudaimonic happiness for women than for men, too. According to Hui, this could be because, in many cultures, women are expected to be kinder than men; so, they may have more to gain from it. And younger participants experienced more happiness when they were kind than older participants, perhaps for developmental reasons, he says.Hui isn't sure why acting kind might have these different effects on different groups, but he points to theories put forth by researcher Elizabeth Midlarsky: Being kind may make us feel better about ourselves as a person or about the meaning of our lives, help us forget our own troubles and stresses, or help us be more socially-connected with others.4. What does the data in the second paragraph intend to show?A. The recent paper is worthy of being read.B. The recent paper gives convincing results.C. Kindness is always a hot topic of research.D. Kindness is closely linked to one's well-being.5. What does the underlined word "astounded" in paragraph 3 mean?A. Afraid.B. Certain.C. Excited.D. Surprised.6. Which of the following acts of kindness can make one feel happier according to paragraph 4?A. Volunteering in a hospital.B. Cleaning a community.C. Returning a lost item to its owner.D. Collecting donations for the poor.7. What do the researchers find from the paper?A. Being kind has different effects on different groups.B. Eudaimonic happiness makes people feel comfort.C. The younger experienced more happiness than the older.D. Female participants are kinder than male ones.CIf you’re looking for a reason to care about tree loss, this summer’s record-breaking heat waves might be it. Trees can lower summer daytime temperatures by as much as 10 degrees Fahrenheit, according to arecent study. But tree cover in US cities is shrinking (缩减). A study published last year by the US Forest Service found that we lost 36 million trees annually from urban and rural communities over a five-year period. “If we continue on this path, cities will become warmer, more polluted and generally unhealthier for inhabitants,” said David Nowak, a senior US Forest Service scientist and co-author of the study. Nowak says there are many reasons why our tree cover is declining, including hurricanes, tornadoes, fires, insects and disease. But the one reason for tree loss that humans can control is sensible development.Nowak says there is a downside to trees too, such as pollen allergy (花粉过敏) or large tailing branches in storms, and people don’t like sweeping leaves. But, he says, there are ways cities and counties can manage trees to help communities thrive (繁荣). Urban forests especially need our help to replace fallen trees. Unlike rural areas, it is very difficult for trees to repopulate themselves in a city environment with so much pavement and asphalt (沥青). “A lot of our native trees can’t actually find a place to drop a seed so they can regenerate,” explains Greg Levine, co-executivedirector of Trees Atlanta. “That’s why the community has to go in and actually plant a tree because the areas just aren’t natural anymore.”Nowak says the first step is caring for the trees on your own property (财产). “We think we pay for our house,and sowe must maintain it. But because we don’t pay for nature, we don’t need to. And that’s not necessarily true.”8. Why does the author mention “trees can lower summer daytime temperatures”?A. To tell the temperatures in summer are high.B. To explain the reason of tree loss.C. To tell trees are helpful.D. To introduce the topic.9. How can humans control tree loss according to Nowak?A. Develop cities in reasonable ways.B. Prevent fires form damaging trees.C. Improve climate to let trees grow.D. Decrease insects in cities.10. Why do forests in cities need our help?A. Because trees don’t grow in a city environment.B. Because native trees don’t drop seeds any more.C. Because trees in urban areas can’t regenerate naturally.D. Because humans want to plant more trees.11. What is the purpose of this passage?A. Describe the importance of trees in cities.B. Appeal people to protect trees in their surroundings.C. Ask people to plant trees with the author.D. Show the number of trees in theUSis declining.DBefore moving to Stokholm, I did my research on Sweden and was confident about my move. However, I quickly realized on my first day that so much of what I learnedwas so very wrong. There are many things that a Google search cannot show about Sweden.The first is fika. A fika is taking a break from whatever you are doing to enjoy a coffee with friends. Swedes value community highly so it makes sense that they would like to set aside time each day to reconnect with others. Fika is a great time to meet new people as well as catch up with friends.I grew up in the American South where everyone is very friendly. I found that little things like not being askedmy life story at the coffee shop by the waiter upset me. However, Swedish people are not rude. Instead, they practice being logom, which means “just enough”.The winters can be very dark and cold, so the Swedish people do not take any sunny day for granted. Since the weather has been fine, I have found myself walking a lot around Stockholm. Often it is easiest to get from place to place by walking, which allows you to see so much of the city and enjoy the fresh air. Though it has been very tiring to get used to, it also has made me feel better about all of the kardemummabullar that I have been eating!I think it is important for students who want to study abroad to know that it is hard to move to countries no matter how “similar” you may think they may be. You have to jump in with both feet and be patient with yourself as well as others. As long as you keep an open mind and are willing to learn, you will have a great experience.12. What do we know about fika?A. It is a waste of time.B. It is a way to balance life and work.C. It is all about drinking coffee.D. It is a Swedish social tradition.13. What does the author think of Swedish people?A. They are friendly.B. They seem a bit cold.C. They appear really rude.D. They are interested in other's life.14. Why does the author like walking?A. It is fun and not very tiring.B. It is good exercise on cold days.C It allows her to enjoy sunny days. D. It gives her the chance to eat the local food.15. What's the author's advice for students going abroad?A. Be confident.B. Be careful.C. Be open- minded.D. Be hard- working.第二节（共5小题；每小题2分，满分10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。
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同济大学课程考核试卷（A卷）2012 —2013 学年第一学期课号：10014501 课名：数据库系统原理（双语）考试考查：考试此卷选为：期中考试( )、期终考试( )、重考( ) 试卷年级专业学号姓名得分Ⅰ. Multiple choice (20 marks, 2 marks each)（C ）1. Five basic relational algebra operations are , others can be derived from these operations.A. ⋂，-，π，σ，⨯B. ⋃，-，π，σ，C. ⋃，-，π，σ，⨯D. ⋂，÷，π，σ，（ABD）2. The following aggregation function(s) will neglect null value. A. SUM B. MAXC. COUNTD. A VG（A. ）3. Given R<U, F>, U={A,B,C}, F={B→C}, a decomposition of R is ρ={AB, BC}, and the decomposition is:A. lossless-join, dependency preservingB. lossless-join, not dependency preservingC. lossy-join, dependency preservingD. lossy-join, not dependency preserving（BD ）4. When we generate relational schemas from an E-R diagram, the rules for relationship sets are:A. for a binary 1: n relationship set, translate it into a relation, and the primary key of the relationship set is the primary key of the “1” side entity set;B. for a binary 1: n relationship set, translate it into a relation, and the primary key of the relationship set is the primary key of the “n” side entity set;C. a binary 1: n relationship set can be united with the “1”side entity set, and translated into one relation;D. a binary 1: n relationship set can be united with the “n”side entity set, and translated into one relation;（ABC）5. If R∈BCNF, then:A. non-attributes are entirely functional dependent on non-key attributes;B. all key attributes are entirely functional dependent on each candidate key that does not contain them;C. all partial dependencies and transitive dependencies are removed for anyattributes;D. all anomalies are removed within any dependency scope.（AD）6. For PRIMARY KEY definition in CREATE TABLE, when a user wants to insert a tuple into the table, the RDBMS will:A. check for the primary key value, and deny the insertion if it is not unique;B. check for all attributes, and deny the insertion if there is one null value;C. check for all candidate key attributes, and deny the insertion if there is one null value;D. check for all primary key attributes, and deny the insertion if there is one null value（B. ）7. Transforming ER diagram into relational data model belongs to the step ofA. Requirement analysisC. Conceptual design（ABD）8. When dealing with null value in SQL statements, the following correct is(are) .A. AGE IS NULLB. AGE IS NOT NULLC. AGE = NULLD. NOT (AGE IS NULL)（C ）9. The global constraints in SQL statements are check clause based on tuples and .A. NOT NULL constraintB. Domain constraintC. AssertionD. Foreign Key clause（ACDE）10. A DBA’s duties are:A. database restoration and recovery;B. transaction processing and concurrency control;C. security and integrity control;D. performance monitoring, analyzing, and tuning;E. database reforming and restructuring.Ⅱ. Analysis (12 marks, 6 marks each)Are the following E/R diagrams good designs? Justify your answer and try to give better designs if they exist. If you feel they work well under some requirements but not under others, give specific examples. To simplify, keys are not underlined in the diagrams.a.Below is an E/R diagram for companies and employees. One constraint forthe E/R diagram below is that each employee can work in only onecompany.Solution:By making “manager” an attribute, the diagram maintains the one-to-one relationship. However, it does not guarantee that the manager is one of the employees.b.Below is an E/R diagram for a company database involving projects,departments, and employees. Each project can be sponsored by severaldepartments and monitored by several employees in the company. Eachdepartment can sponsor several projects. Each employee can monitor severalprojects and may work in several departments. An employee can monitor aproject that is not in his department.Solution:In this case a trade-off needs to be made between binary relationship and ternary relationship. The same information can be modeled more naturally using the E/R diagram as below. It’s not a good idea to blend the concept of “sponsor” and “monitor” together. Also, in the original diagram, we lost the information of which employee works in which company.Solution:Ⅲ. Relational Database Design and Query (50 marks)1.Assume four relations P, Q, R, and S containing the following tuples, respectively.Give out the results of the following expressions. (6 marks, 2 marks for each)P: A B C D Q: B C E R: B C E S: C Da b c d b d e d c a c d a b e f b c f b d e e f b c e f d c a b c e b d c d d e b b d e fa. P ♦ Qb. P ÷Sc. σ1=5(Q ×S) a.b.c.2. Consider a relation schema R<U, F>, where U={A,B,C,D,E,G}, and the set of functional dependencies F={AB →C, C →A, BC →D, ACD →B, D →EG , BE →C, CG →BD, CE →AG}. (6 marks, 3 marks for each)a. Compute the attribute closure +F AB )(.b. Find a minimal cover for F.a. +F AB )( = ABCDEG b. A minimal cover for F is:{AB →C, C →A, BC →D, CD →B, D →E, D →G , BE →C, CG →D, CE →G}3. Consider the relation schema R<U, F>, where U={A,B,C,D}, and F={A →B, C →A, C →D, D →B, B →C}. Suppose that ρ={R 1, R 2, R 3} is a decomposition of R, where R 1={A, B}, R 2={B, C}, and R 3={C, D}. Is the decomposition ρ of <U, F> lossless? (5 marks)The decomposition ρ of <U, F> is lossless.4.Given the relational schema R<U, F>, U={A,B,C,D,E }, F={AC→BD, B→C,C→D, B→E};e Armstrong axioms and related rules to proof the functional dependencyAC→E; (3 marks)b.Find a canonical cover Fc of F, and find all candidate keys, then point out R isin which normal form; (5 marks)c.Decompose R into 3NF, which the decomposition is lossless-join anddependency preserving. (5 marks)Solution：a. 由AC→BD得AC→B（分解规则）；再由B→E，则有AC→E（传递规则）b. 对R<U, F>中的函数依赖集F进行极小化处理，得最小依赖集Fm={AC→B, B→C, C→D, B→E}，仍记为F；c. 判定R属于第几范式：R的候选码有：AC、AB；主属性为A、B、C；由C→D可见，非主属性D对码AC为部分函数依赖，故R∉2NF, R∈1NF。