全品学练考上八年级英语
全品学练考英语八上答案2022人教版
全品学练考英语八上真题及答案2022人教版2021全品学练考英语八上真题及答案人教版一、单项填空1. ---Do you enjoy your English lesson?---Yes, _______. I think it’s really helpful for us to learn English.A. I supposeB. I’m afraid notC. I hope soD. I’m sure答案：D2. I can ______my weekend by helping the older people in my neighborhood.A. killB. destroyC. spendD. affect答案：C3. The test was too difficult. I didn’t _______most of the questions.A. answerB. askC. argueD. mention答案：A4. Could you _______me the way to the nearest post office?A. sellB. buyC. haveD. show答案：D5. _______ next year, he will take PE classes three timesa week.A. InB. AtC. OnD. For答案：A二、完形填空There is a traffic light near my school. Every morning and afternoon, it turns green 6 students from our school walk across the street. But some students still 7 the trafficlights and try to cross the street when there is no green light.Last week, my friend ran across the street when thetraffic light was red. Fortunately, 8 happened. But one of my teachers saw the whole thing. He asked us why we couldn’twait for the green light. Then he showed us a 9 about traffic safety.The traffic accident in the story was very 10 . It toldus that one day a young girl was walking across the street when the light was green. She 11 the red light. The girl did not see the car coming from the side. She was hit by the car and was badly 12 . It was a warning to us, telling us to stop, look and listen before crossing the street.The traffic light is there to keep us 13 . From now on I will always remember the 14 . “Stop! Look! Listen!”6. A. so that B. even though C. as long as D. in orderthat答案：A7. A. obey B. watch C. trust D. ignore答案：D8. A. anything B. nothing C. something D. everything答案：B9. A. cartoon B. advertisement C. movie D. story答案：D10. A. foolish B. exciting C. impressive D. dangerous答案：D11. A. passed out B. passed away C. passed through D. passed off答案：C12. A. broken B. injured C. shocked D. surprised答案：B13. A. on time B. in sight C. at rest D. safe答案：D14. A. story B. sentence C. description D. words答案：D三、阅读理解ASome people think shopping is like a type of exercise. It can be done in a mall or store, but it’s often more interesting to go shopping in a busy city.Shopping can be time consuming and stressful, especially if the stores are crowded. On the other hand, it can be fun and exciting. Shopping in the city can be especially enjoyable because there is so much to look at and do. The sights, sounds and smells of a large city can be enticing to some people.Shopping can also be a great way to meet new people. While walking around a new city, you might spot a friend or colleague you haven’t seen in a while. You might even meet someone from a different country and learn about their culture.In addition, shopping can be a great way to explore a new city. You can walk along a charming, tree-lined street or visit one of the city’s many parks. You can even take a break from all of the shopping and go for some sightseeing.15. According to the passage, which of the following is NOT true?A. Shopping can be stressful.B. Shopping can be done in a store.C. Shopping can be interesting in a city.D. Shopping can help people learn about culture.答案：B16. What might people do while shopping in a city?A. Have a picnic.B. Spot an old friend.C. Go to a mall.D. Take exercise.答案：BBUnless you are a hermit (隐士) living completely alone, communication is a very important part of life. Think aboutit. Communication is what sets us apart from animals, as well as helping us build relationships and develop as individuals.When communicating with someone, whether it be over the phone, or face-to-face, it is important to be a good listener. People feel more comfortable talking when they know their words are being valued and respected. Try asking yourself the following questions when communicating:How can I show that I understand what the other person is saying?What is the other person really trying to say?What type of body language or facial expressions can Iuse to show that I am listening?It’s also a good idea to summarise what the other person has said in your own words. This will show that you arelistening and allow them to correct you if you have misunderstood.17. What sets human beings apart from animals according to the passage?A. Communication.B. Relationships.C. Ability to develop.D. The ability to talk.答案：A18. What can people do when they communicate with others in order to show that they are listening?A. Speak in their own words.B. Show understanding.C. Use body language.D. All of the above.答案：D四、任务型阅读People used to think the brain worked the same way in each person, but science has proved this isn’t true. Researchers using new kinds of brain imaging (成像) technology are learning how the brain can differ from person to person.MRI (核磁共振) scans measure the small changes in the brain when a particular task is performed. Researchers have used MRI to map the location of the brain activities that occur when a person speaks, reads or listens to music.MRIs can show us how different activities use different parts of the brain. For example, scientists found that when adults want to understand words, their brain worksdifferently compared to when adults are asked to learn patterns.When scanning adults, some areas of the brain are always active, but in some adults, these same areas show different levels of activity. This suggests that the way people learn or solve problems can be quite different.The human brain is amazing in its complexity. No two brains are exactly the same and scientists are excited by their findings. They believe this new information about brain activity may help us better understand the differences between humans.19. What does the Passage mainly talk about?A. Brain imaging technology.B. MRIs and brain activities.C. Brain differences.D. How the brain works.答案：C20. What have scientists found when they used MRI to map the brain activities?A. Different activities use different parts of the brain.B. The same areas of the brain can differ in different adults.C. The brain is more complex than we thought.D. Intelligence relies on the same brain parts in adults.答案：A。
全品学练考答案人教版
全品学练考真题及答案人教版必修一Unit 1 Friendship一、单项选择1. --- _____ you ever been to the Great Wall?--- Yes, I have.A. AreB. DoC. HaveD. HasC. Have2. --- Is your camera ______ ?--- No, I brought it here last week.A. made in ChinaB. made in EnglandC. made of plasticD. made from ChinaA. made in China3. My father usually gets up early _______ the morning exercise.A. doingB. doC. to doD. didC. to do4. ---Which do you prefer, music or singing?---I prefer_______.A. eitherB. neitherC. allD. noneB. neither5. --- Have you ______ the movie star?--- No, I haven't.A. seenB. seeingC. seesD. seeingA. seen二、完形填空One Sunday morning, I got up later than usual. I __1__ looked at the clock. It was already 11:00. I was too__2__ to do anything.While I was __3__ something to eat, I heard a friend of mine at my door. She asked me to __4__ her to the new hospital. I was quite surprised because I hadn't__5__ of it.My friend's face was very white. I knew at once that something __6__ serious. She said that her father was __7__ seriously ill. We soon took a taxi and__8__ at the hospital. On the way there, my friend didn't __9__ a word. She was__10__ in thought.We went to the specialized department and soon met the doctor. He __11__ us that the patient needed an urgent operation. We were all __12__.The patient was very __13__. After the successful operation, he was transferred to a better ward. We __14__ couldn't believe it. We were all so__15__ and happy.1. A. hardly B. quickly C. slowly D. immediatelyA. hardly2. A. brave B. tired C. excited D. sadB. tired3. A. finding B. expecting C. making D. forgettingC. making4. A. visit B. tell C. accompany D. thankC. accompany5. A. heard B. said C. thought D. imaginedA. heard6. A. looked B. sounded C. happened D. changedB. sounded7. A. looking B. feeling C. suffering D. wonderingC. suffering8. A. ran B. spoke C. jumped D. arrivedD. arrived9. A. told B. asked C. heard D. saidD. said10. A. surprised B. worried C. lost D. embarrassedB. worried11. A. heard B. thought C. promised D. toldD. told12. A. anxious B. anxious C. disappointed D. impressedA. anxious13. A. silent B. serious C. strong D. weakD. weak14. A. almost B. mainly C. even D. stillA. almost15. A. interested B. nervous C. relieved D. angryC. relieved。
全品学练考参考答案
全品学练考参考答案全品学练考参考答案全品学练考是一项旨在提高学生综合素质和学习能力的考试。
它不仅考察学生的学科知识，还注重培养学生的思维能力、创新能力和实践能力。
下面是全品学练考的参考答案，供广大学生参考。
一、数学1. 解：设这个数为 x，根据题意，可以得到以下方程：x + 2 = 5解得 x = 3所以这个数为 3。
2. 解：根据题意，可以列出方程：2x + 3 = 9解得 x = 3所以这个数为 3。
3. 解：根据题意，可以列出方程：3(x - 2) = 15解得 x = 7所以这个数为 7。
4. 解：根据题意，可以列出方程：4x + 5 = 25解得 x = 5所以这个数为 5。
5. 解：根据题意，可以列出方程：5(x + 4) = 45解得 x = 7所以这个数为 7。
二、英语1. 解：根据题意，可以得出以下答案：A. The weather is nice today.B. I have two brothers and one sister.C. My favorite subject is English.D. I want to be a doctor in the future.2. 解：根据题意，可以得出以下答案：A. What's your name?B. How old are you?C. Where do you live?D. What's your favorite color?3. 解：根据题意，可以得出以下答案：A. I like playing soccer.B. My favorite food is pizza.C. I enjoy reading books.D. I want to travel around the world.4. 解：根据题意，可以得出以下答案：A. I usually get up at 7 o'clock.B. I go to school by bus.C. I have lunch at 12 o'clock.D. I do my homework in the evening.5. 解：根据题意，可以得出以下答案：A. I like listening to music.B. My favorite animal is a dog.C. I enjoy watching movies.D. I want to learn how to play the piano.三、科学1. 解：根据题意，可以得出以下答案：A. The sun is a star.B. Water boils at 100 degrees Celsius.C. Gravity is a force that pulls objects towards each other.D. Plants use sunlight to make food through a process called photosynthesis.2. 解：根据题意，可以得出以下答案：A. The human body has 206 bones.B. Oxygen is necessary for living organisms to survive.C. The Earth revolves around the sun.D. Sound travels in waves.3. 解：根据题意，可以得出以下答案：A. The three states of matter are solid, liquid, and gas.B. The human heart pumps blood throughout the body.C. The Earth's atmosphere is composed mainly of nitrogen and oxygen.D. The process of digestion begins in the mouth.4. 解：根据题意，可以得出以下答案：A. The force of friction opposes the motion of objects.B. The human respiratory system consists of the lungs and airways.C. The Earth's magnetic field is generated by the movement of molten iron in its core.D. The process of photosynthesis produces oxygen and glucose.5. 解：根据题意，可以得出以下答案：A. The human nervous system consists of the brain, spinal cord, and nerves.B. The process of evaporation occurs when a liquid changes into a gas.C. The Earth's tectonic plates move due to the convection currents in the mantle.D. The process of mitosis is responsible for cell division and growth.四、历史1. 解：根据题意，可以得出以下答案：A. The Great Wall of China was built to protect the country from invasions.B. The Renaissance was a period of cultural and artistic rebirth in Europe.C. The American Revolution led to the independence of the United States from Great Britain.D. The Industrial Revolution marked a shift from manual labor to machine-based manufacturing.2. 解：根据题意，可以得出以下答案：A. The French Revolution was a period of political and social upheaval in France.B. World War I was triggered by the assassination of Archduke Franz Ferdinand of Austria.C. The Cold War was a period of tension and rivalry between the United States and the Soviet Union.D. The Civil Rights Movement in the United States fought for equal rights for African Americans.3. 解：根据题意，可以得出以下答案：A. The Mongol Empire was the largest empire in history, spanning from Asia to Europe.B. The Renaissance was characterized by a renewed interest in art, science, and humanism.C. The Industrial Revolution led to significant advancements in technology and the growth of cities.D. The Age of Exploration resulted in the discovery of new lands and the establishment of global trade routes.4. 解：根据题意，可以得出以下答案：A. The American Civil War was fought over issues of slavery and states' rights.B. The Russian Revolution led to the establishment of a communist government in Russia.C. World War II was a global conflict that involved many countries and resulted in the Holocaust.D. The Space Race between the United States and the Soviet Union led to the moon landing in 1969.5. 解：根据题意，可以得出以下答案：A. The Renaissance was a period of cultural and intellectual growth in Europe.B. The Industrial Revolution transformed society with the invention of new machines and technologies.C. The Civil Rights Movement in the United States fought against racial segregation and discrimination.D. The Cold War was a period of political tension between the United States and the Soviet Union.以上是全品学练考的参考答案，希望对广大学生有所帮助。
全品学练考英语听写手册电子版
全品学练考英语听写手册电子版1、—______ do you pay for it? —Over the Internet. （）[单选题] *A. WhatB. How muchC. How(正确答案)D. When2、Its’time to go to bed. _______ your computer, please. [单选题] *A. Turn onB. Turn inC. Turn off(正确答案)D. Turn down3、My friends will _______ me at the airport when I arrive in London. [单选题] *A. takeB. meet(正确答案)C. receiveD. have4、At nine yesterday morning, I ______ an English class while they ______ a PE class.（）[单选题] *A. was having; were having(正确答案)B. had; hadC. was having; hadD. had; were having5、______ visitors came to take photos of Hongyandong during the holiday. [单选题] *A. ThousandB. Thousand ofC. ThousandsD. Thousands of(正确答案)6、I have only two tickets for TF Boys’concert. ______ you ______ he can go with me.（）[单选题] *A. Either; or(正确答案)B. Either; norC. Both; andD. Not only; but also7、33．Will Mary's mother ______ this afternoon? [单选题] *A．goes to see a filmB．go to the filmC．see a film(正确答案)D．goes to the film8、27．My father is a professor and he works in__________ university. [单选题] *A．a (正确答案)B．anC．/D．the9、Tom will _______ me a gift from Japan. [单选题] *A. takeB. getC. carryD. bring(正确答案)10、62．--There is? ? ? ? ? sale on in the shop today. Let’s go together.--Please wait? ? ? ? ? ?minute. I’ll finish my homework first. [单选题] *A．a; theB．a; a(正确答案)C．the; aD．the; the11、32．Mr. Black is ______ now, so he wants to go to a movie with his son. [单选题] * A．busyB．free(正确答案)C．healthyD．right12、_____he was seriously ill, I wouldn’t have told him the truth. [单选题] *A.If I knewB.Had I known(正确答案)C.Did I knowD.Were I known13、I don’t like snakes, so I ______ read anything about snakes.（）[单选题] *A. alwaysB. usuallyC. oftenD. never(正确答案)14、—Do you know ______ box it is? —It is ______.（）[单选题] *A. who; myB. whose; meC. who; herD. whose; hers(正确答案)15、Be careful with the knife. You may hurt _______. [单选题] *A. himselfB. ourselvesC. myselfD. yourself(正确答案)16、52．I'm happy to ________ a birthday card from an old friend. [单选题] *A．buyB．makeC．loseD．receive(正确答案)17、Customers see location as the first factor when_____a decision about buying a house. [单选题] *A.makeB.to makeC.making(正确答案)D.made18、Helen is new here, so we know _______ about her. [单选题] *A. somethingB. anythingC. everythingD. nothing(正确答案)19、The Internet is an important means of（）[单选题] *A. conversationB. communication(正确答案)C. speechD. language20、Bill Gates is often thought to be the richest man in the world. _____, his personal life seems not luxury. [单选题] *A. MoreoverB. ThereforeC. However(正确答案)D. Besides21、67．—What can I do for you?—I'm looking at that dress.It looks nice.May I ________？[单选题] *A．hold it onB．try it on(正确答案)C．take it offD．get it off22、The museum is _______ in the northeast of Changsha. [单选题] *A. sitB. located(正确答案)C. liesD. stand23、48．—________ is your new skirt, Lingling?—Black. [单选题] *A．HowB．What colour(正确答案)C．WhichD．Why24、During the Mid-Autumn Festival, family members often gather together _________ ameal, admire the moon and enjoy moon cakes. [单选题] *A. shareB. to share(正确答案)C. having sharedD. shared25、( )He killed the enemy guard and made away _________the villagers. [单选题] *A. with the helpB. with helpC. with help ofD. with the help of(正确答案)26、Tom is very _______. He never cleans his room. [单选题] *A. lazy(正确答案)B. activeC. shyD. healthy27、What’s your _______ for the coming new year? [单选题] *A. playB. plantC. plan(正确答案)D. plans28、She returns home every year to _______ the Spring Festival. [单选题] *A. celebrate(正确答案)B. shareC. watchD. congratulate29、Be _______ when you are driving. [单选题] *A. afraidB. careful(正确答案)C. clearD. clean30、What do you think of the idea that _____ honest man who married and brought up a large family did more service than he who continued single and only talked of _____ population. [单选题] *A. a, /B. an, /C. a, theD. an, the(正确答案)。
八上英语全品听读本小册子人教版
八上英语全品听读本小册子人教版一、总览八上英语全品听读本小册子人教版是我国人民教育出版社出版的一套辅助学习用书。
该系列书籍旨在帮助学生全面提高英语听力和阅读能力，通过各种真实情景的对话和文章，使学生更好地了解英语国家的生活和文化，提高综合语言能力。
二、探究主题1. 关于听力训练在英语学习过程中，听力的重要性不言而喻。
而八上英语全品听读本小册子人教版中，通过丰富多样的听力材料，学生可以接触到各种语速、口音和语调，从而更好地适应真实的英语听力环境。
2. 阅读能力的提升阅读是学习语言的重要途径之一，而八上英语全品听读本小册子人教版涵盖了丰富的阅读材料，既有故事，也有介绍文化和风俗的文章，有助于学生拓展视野，了解世界各地的风情。
3. 文化交流的意义通过小册子中的文章，学生不仅可以了解到英语国家的风土人情，还可以学习到一些地道的英语表达方式，为今后的交流和应用打下坚实的语言基础。
三、价值与意义八上英语全品听读本小册子人教版在帮助学生提高英语综合能力的也培养了学生对世界的认知和理解能力，激发了学生学习英语的兴趣，为日后的学习打下了良好的基础。
这也符合当下教育引导学生全面发展、注重实际运用的趋势。
四、结语八上英语全品听读本小册子人教版不仅仅是一套辅助学习用书，更是学习英语、了解世界的工具。
它的出现，使得学习英语不再枯燥乏味，而是充满乐趣和意义。
希望同学们在使用这套书籍的过程中，能够充分感受到其中的乐趣和收获，努力提高自身的英语能力，为将来的发展打下坚实基础。
（此为文章的梗概，实际撰写的稿件更加详细和深入，字数超过3000字）五、教学理念八上英语全品听读本小册子人教版所秉承的教学理念是以学生为中心，注重激发学生的学习兴趣和主动性，培养学生全面发展的能力。
该系列书籍采用了大量的真实情景和生活化的语言材料，使学生在学习的过程中能够更加贴近实际生活，更容易产生共鸣和理解。
书中的听力和阅读训练，既注重了语言的基础训练，也充分考虑了学生的兴趣和情感因素，让学生在学习英语的同时享受学习的乐趣。
英语全品学练考第二单元卷子作文
英语全品学练考第二单元卷子作文Title: English Practice Exam for Second UnitPart 1: Reading Comprehension1. Read the text and answer the questions below.The Benefits of ReadingReading is an essential skill that can benefit us in many ways. It not only helps to improve our language skills but also broadens our knowledge and worldview. Reading can also be a great source of entertainment and relaxation. Whether you enjoy fiction, non-fiction, or poetry, there is something out there for everyone. So pick up a book and start reading today!Questions:a) What are some benefits of reading?b) How can reading help improve language skills?c) Why is reading considered a source of entertainment and relaxation?d) What types of reading materials are mentioned in the text?2. Read the text and answer the questions below.The Importance of EducationEducation is the key to success in life. By acquiring knowledge and skills through education, individuals can open doors to better opportunities and a brighter future. Education not only helps us to develop intellectually but also prepares us for the challenges of the real world. Therefore, it is important for everyone to value and prioritize their education.Questions:a) Why is education considered the key to success in life?b) How can education open doors to better opportunities?c) In what ways does education help individuals prepare for the challenges of the real world?d) Why is it important for everyone to value and prioritize their education?Part 2: Writing3. Write an essay on the topic "The Impact of Technology on Education" in 300-400 words.4. Write a letter to a pen pal in another country describing your favorite book and explaining why you enjoy reading it.Part 3: Listening Comprehension5. Listen to the audio clips and answer the questions below.Clip 1: A news report on the importance of reading in children's development.Questions:a) Why is reading important in children's development?b) What are some benefits of reading for children?Clip 2: An interview with a teacher about the challenges of online learning.Questions:a) What are some challenges of online learning mentioned in the interview?b) How can students overcome these challenges?Part 4: Speaking6. Choose a topic from the list below and prepare a 2-minute presentation.Topics:a) The benefits of readingb) The importance of educationc) The impact of technology on societyd) My favorite book and why I enjoy reading it Good luck with your exam!。
英语全品学练考第二单元卷子作文
英语全品学练考第二单元卷子作文Class Name: English Complete Learning and PracticeUnit 2 Exam PaperPart A: Reading ComprehensionSection 1: Multiple Choice1. What is the main topic of the passage?A. The benefits of learning a second languageB. The history of the English languageC. The importance of reading for childrenD. The impact of technology on language learning2. According to the passage, why is it important for children to start learning a second language at a young age?A. It helps them improve their memory skillsB. It allows them to communicate with people from different culturesC. It increases their chances of getting a job in the futureD. It makes them more confident and independent3. Which of the following statements is true according to the passage?A. Learning a second language has no impact on a child's academic performanceB. Children who are bilingual tend to have betterproblem-solving skillsC. Parents should not encourage their children to learn a second languageD. Technology has made it easier for children to learn a second language4. What does the author suggest parents do to help their children learn a second language?A. Enroll them in language courses as early as possibleB. Hire a private tutor to teach them at homeC. Use technology to supplement their learningD. Let them learn on their own without any helpSection 2: True or False1. Learning a second language can help children improve their problem-solving skills. (True/False)2. Technology has made it more difficult for children to learna second language. (True/False)3. Parents should wait until their children are teenagers to start teaching them a second language. (True/False)4. Children who are bilingual tend to perform worse in school compared to monolingual children. (True/False)Part B: WritingWrite an essay of at least 300 words on the following topic: "The Benefits of Learning a Second Language"In today's globalized world, learning a second language has become more important than ever. There are countless benefits to being bilingual or multilingual, both for children and adults.First and foremost, learning a second language can open up a world of opportunities. It allows individuals to communicate with people from different cultures and backgrounds, making it easier to form connections and build relationships. In a professional setting, being bilingual can give someone a competitive edge and increase their chances of landing a job or advancing in their career.Furthermore, learning a second language has been shown to have cognitive benefits. Studies have found that bilingualindividuals tend to have better problem-solving and critical thinking skills. They are also better at multitasking and have improved memory retention. These cognitive benefits not only help in academic and professional settings but also in everyday life.Another advantage of learning a second language is the cultural enrichment it provides. Language is closely tied to culture, and by learning a new language, individuals also gain a deeper understanding and appreciation for the customs, traditions, and values of the people who speak that language. This can lead to greater empathy and tolerance for different perspectives and ways of life.In conclusion, the benefits of learning a second language are numerous and far-reaching. Whether it's for personal, professional, or academic reasons, being bilingual or multilingual can enhance one's life in countless ways. Therefore, it is never too late to start learning a new language and reap the rewards that come with it.Overall Score: _______Comments:- Good job on the reading comprehension section, you demonstrated a strong grasp of the main ideas and details in the passage.- Your essay was well-written and addressed the topic effectively. Make sure to provide specific examples or evidence to support your points next time.- Keep up the good work and continue practicing your English skills!。
八上英语全品基础读写听写本
八上英语全品基础读写听写本
复习要点：1.单元测试卷期末（A）P：56有关‘环境污染与保护“的话题，P86.P88：关于“环境，动物保护”
的话题。
2.练习期P：104：教材P101有关“，安全上网，互联网优缺点”的话题。
3.教材：P32“3”，P33“2”关于清假单的书写。
P18：“3”P50：1bP51：“10”关于健康的话题。
H62、78关于爱好，兴趣的话题。
P91：2c”How to protect yourself in a fire？关于“安全遵险”的话题。
Pl07关于“英语学习的话题”。
1.（A）.环境保护，低碳生活：目前，全世界的志愿者掀起了“低炭环保，从我做起”的活动热潮。
请你写一篇以
“How to Protect the cnvironment？（保护环境）”为主题的英语短文。
提示：
少开车，骑自行车；
（2）低碳生活1ow-carbon life；
（3）使用节能灯，离开房间关灯，减少淋浴时间，节约用水；
（4）循环利用苦、纸，将用过的课本留给下届学生；
（5）购物时自己带袋、不用塑料袋吗，少用纸巾。
（6）利用should，must，need，can 等。
参考词汇：energy-saving lamp n.节能灯；used adj.用过的；lower grades n.下居；plastic bags n.塑料袋（1）词数：80-100词左右；开头结尾已给出不计入总词数。
英语全品学练考第二单元卷子作文
英语全品学练考第二单元卷子作文全文共3篇示例，供读者参考篇1English Comprehensive Examination Unit 2Part I: Reading Comprehension1. Read the following passage and answer the questions below:One of the most famous landmarks in the world is the Eiffel Tower in Paris, France. The tower was built in 1889 for the Exposition Universelle, a World's Fair celebrating the 100th anniversary of the French Revolution. The Eiffel Tower was designed by Gustave Eiffel, a famous French engineer. At first, many people did not like the tower because they thought it was too modern and not beautiful. However, over time, the Eiffel Tower became a symbol of Paris and France and is now one of the most visited tourist attractions in the world.Questions:a. When was the Eiffel Tower built?b. Who designed the Eiffel Tower?c. Why did some people not like the Eiffel Tower at first?d. What is the Eiffel Tower now considered as?2. Read the following passage and fill in the blanks with the correct words:The Great Wall of China is one of the most (1)_______ landmarks in the world. It was built over (2)_______ years ago to protect China from invaders. The wall is (3)_______ kilometers long and stretches across the northern part of China. It is made of (4)_______ and stones. Many tourists visit the Great Wall to walk along its (5)_______ and admire the beautiful views.Part II: WritingWrite an essay on the following topic:"Importance of Learning a Second Language"In today's globalized world, learning a second language is becoming increasingly important. There are several benefits to learning a second language, including improved communication skills, increased job opportunities, and enhanced cognitive abilities.Firstly, learning a second language improves communication skills. Being able to speak more than one language allowsindividuals to communicate with a wider range of people and understand different cultures. This can help in personal and professional relationships, as well as when traveling to different countries. Additionally, learning a second language can open up new opportunities for job seekers. Many companies are looking for bilingual or multilingual employees who can communicate with international clients and partners. Knowing a second language can give individuals a competitive edge in the job market.Furthermore, learning a second language has been shown to enhance cognitive abilities. Studies have found that bilingual individuals have better problem-solving skills, improved memory, and enhanced multitasking abilities. Learning a second language requires individuals to think in different ways, which can help strengthen the brain and improve overall cognitive function.In conclusion, learning a second language is a valuable skill that can benefit individuals in many aspects of their lives. From improving communication skills to enhancing cognitive abilities, knowing a second language can open up a world of opportunities. It is important for individuals to recognize the importance of learning a second language and make an effort to develop this skill.篇2English Full-Scale Learning and Practice Unit 2 Questionnaire EssayUnit 2 of the English full-scale learning and practice test will focus on various aspects of the English language such as vocabulary, grammar, reading comprehension, writing, and speaking. This unit aims to test the students' proficiency in English and help them enhance their skills in all areas of the language.The questionnaire for Unit 2 consists of multiple-choice questions, fill-in-the-blanks, reading comprehension passages, and writing prompts. Students are required to answer each question to the best of their ability and demonstrate their understanding of the topics covered in the unit.One of the key focuses of Unit 2 is vocabulary building. Students will be tested on their knowledge of synonyms, antonyms, homophones, and idioms. They will also be required to use the correct word in a given sentence and match words with their meanings.Grammar will also be a significant component of the test. Students will need to identify the correct tense, use the correctform of the verb, and choose the appropriate prepositions in sentences. They will also be tested on their understanding of parts of speech and sentence structure.Reading comprehension passages will test students' ability to understand and interpret written texts. They will need to answer questions based on the passages, demonstrate their ability to infer information, summarize key points, and make connections between ideas.In the writing section, students will be given prompts to write essays, paragraphs, or sentences on specific topics. They will need to focus on coherence, organization, grammar, and vocabulary while expressing their ideas effectively.Finally, the speaking component of the test will require students to engage in conversations, express opinions, describe pictures, or narrate stories. This section aims to assess the students' oral communication skills and ability to articulate their thoughts in English.Overall, Unit 2 of the English full-scale learning and practice test is designed to assess students' proficiency in all areas of the English language. By completing this unit, students will be able to enhance their English skills and prepare for real-life communication situations.篇3English Full Range of Learning Practice Second Unit Test PaperName: ________ Class: ________ Date: ________Part One: Listening1. Listen to the conversation and choose the correct answer:a) A: What's your favorite food?B: Sushi.b) A: How do you go to school?B: By bus.c) A: Where is the library?B: It's next to the post office.2. Listen to the dialogue and fill in the blanks:A: What time is it?B: It's __________.A: Thank you.3. Listen to the passage and answer the questions:a) What did Mike think of the movie?b) What did Sarah do last weekend?c) Where is the school trip going to be held? Part Two: Reading1. Read the passage and answer the questions:a) Why did Tom miss the bus?b) Where does Tom want to go?c) How does Tom plan to get there?2. Read the conversation and fill in the blanks: A: What's ____ your backpack?B: Some books, a pencil case, and a water bottle.3. Read the text and choose True or False:a) There are four seasons in a year.b) Summer is the coldest season.c) Winter is from December to February.Part Three: WritingWrite a short paragraph about your last vacation. Include where you went, what you did, and who you went with.Part Four: SpeakingHave a conversation with your partner about your favorite hobbies. Discuss why you enjoy them and how often you do them.Thank you for taking the English Full Range of Learning Practice Second Unit Test Paper. Good luck!。
英语全品学练考八年级上册答案
英语全品学练考八年级上册答案 Unit 11. A. She’s from Canada.2. B. He’s twelve.3. C. She’s tall and thin.4. A. He’s a student.5. C. He likes playing basketball.6. B. She’s a nurse.7. A. He’s friendly.8. C. She’s from the USA.9. B. He’s an engineer.10. A. He’s thirty-five.Unit 21. B. He’s go ing to the movies.2. A. She’s going to the library.3. C. He’s going to the park.4. B. She’s going to the bookstore.5. A. He’s going to the museum.6. C. She’s going to the zoo.7. B. He’s going to the supermarket.8. A. She’s going to the bank.9. C. He’s going to the post office.10. B. She’s going to the hospital.Unit 31. B. She’s going to take a bus.2. A. He’s going to take a taxi.3. C. She’s going to take a train.4. B. He’s going to take a plane.5. A. She’s going to take a boat.6. C. He’s going to take a bike.7. B. She’s going to take a subway.8. A. He’s going to take a car.9. C. She’s going to take a bus.10. B. He’s going to take a train. Unit 41. B. She’s going to the beach.2. A. He’s going to the mountains.3. C. She’s going to the forest.4. B. He’s going to t he desert.5. A. She’s going to the lake.6. C. He’s going to the river.7. B. She’s going to the valley.8. A. He’s going to the island.9. C. She’s going to the waterfal l.10. B. He’s going to the park.。
全品英语八年级山西unit8综合测试卷
全品英语八年级山西unit8综合测试卷一、听力(听力)(共20小题;共20分)听力理解(共20小题;每小题1分，满分20分)第一部分，听到对话提问问题。
(听到两遍计10分后，每小题1分后)本部分共有10道小题，每小题你将听到一段对话，每段对话听两遍。
在听每段对话前，你有5秒钟的时间阅读题目;听完每段对话后，你将有5秒钟的时间选出你认为最合适的答案。
1. Which country has Jim been to?A. B. C.2. What does Andy think of living a green life?A. B. C.3. What kind of book is Kate reading?A. B. C.4. What does the sign mean?A. B. C.5. Who was the girl sending the card to?A. To her friend.B. To someone else.C. To nobody.6. How long has Mary had the car?A. Seven years.B. Six years.C. Six days.7. What's David doing now?A. He's playing with Millie and Kitty.B. He's recommending a new chairperson.C. He is thanking Millie and Kitty for recommending him.8. What time is it now?A. It's 8:00.B. It's 8:15.C. It's 8:30.9. What is Daniel?A. A policeman.B. A teacher.C. A doctor.10. What does the woman mean?A. Buying some beautiful clothes will make baby smile.B. Dressing babies up like dolls will stop them crying.C. Showing lovely dolls may make babies stop crying.第二部分，听到对话和短文提问问题。
八年级英语全品听读本
八年级英语全品听读本
八年级是英语学习的重要转折点，这一时期的英语课程，更加注重实际应用能力和自主学习能力的培养。
而《八年级英语全品听读本》正是为满足这一阶段学生的学习需求而设计的。
本书以提高学生听力和阅读水平为核心目标，通过丰富的听力材料和多样的阅读篇章，帮助学生全面提升英语听说读写能力。
听力部分涵盖了日常生活、文化交流、科普知识等多个领域，旨在拓宽学生视野，增强跨文化交流意识。
阅读部分则精选了各类文章，既有经典文学作品，也有反映时代特色的时文，旨在培养学生的阅读兴趣和批判性思维。
本书注重自主学习能力的培养。
每个单元都配有丰富的互动练习，如听力填空、阅读理解、词汇运用等，旨在引导学生主动参与学习过程，培养独立解决问题的能力。
此外，书中还提供了丰富的拓展资源，如背景知识、词汇解释、听力原文等，方便学生自主学习和深入研究。
总体而言，《八年级英语全品听读本》是一本内容丰富、设计精良的英语学习教材。
它不仅有助于提高学生的英语实际应用能力，还注重培养学生的自主学习和跨文化交流能力。
八上全品作业本英语长春版随堂小测
八上全品作业本英语长春版随堂小测
【原创实用版】
目录
1.介绍八上全品作业本英语长春版随堂小测
2.详细说明随堂小测的内容和形式
3.分析随堂小测对学生学习的作用和意义
4.结论
正文
一、介绍八上全品作业本英语长春版随堂小测
八上全品作业本英语长春版随堂小测是一种针对中学生英语学习的
辅导材料。
它旨在帮助学生在课堂上更好地掌握英语知识，提高英语能力，同时帮助教师检测学生的学习效果，为教学提供参考。
二、详细说明随堂小测的内容和形式
1.内容：随堂小测的内容紧密结合课堂教学，涵盖了语音、语法、词汇、句型、阅读理解、写作等多个方面，全方位地检验学生的英语综合运用能力。
2.形式：随堂小测采用选择题、填空题、阅读理解题、写作题等多种题型，既有客观题，也有主观题，旨在全面考查学生的英语水平。
三、分析随堂小测对学生学习的作用和意义
1.帮助学生巩固课堂知识：随堂小测能让学生在课堂上及时复习、巩固所学知识，提高学习效果。
2.激发学生的学习兴趣：随堂小测的题目设计新颖、有趣，能够激发学生的学习兴趣，提高学生的学习积极性。
3.培养学生的自主学习能力：随堂小测鼓励学生自主完成，培养学生
的自主学习能力。
4.帮助教师了解学生学习情况：随堂小测可以帮助教师了解学生的学习情况，及时发现问题，调整教学方法，提高教学质量。
四、结论
八上全品作业本英语长春版随堂小测是一种对学生英语学习具有重
要意义的辅导材料。
它能够帮助学生更好地掌握英语知识，提高英语能力，同时也有助于教师了解学生的学习情况，提高教学质量。
八年级上册安徽2022英语全品答案人教版
八年级上册数学书电子版青岛版
随着科技的高速发展，数学书也发生了翻天覆地的变化，越来越多
的学校已经开始使用电子版书籍，特别是青岛版的八年级上册的数学书，它在校园中的普及率越来越高。
一、八年级上册数学书电子版青岛版的优点
1．首先，八年级上册数学书电子版青岛版的优点在于其高的实用性。
就目前的情况而言，这款电子书的实用性比传统的纸质书更强。
它可
以节省大量的学习时间，极大地提高了效率；
2．其次，它还拥有数学书特有的功能，比如解题、课堂趣味游戏、历
届考题、自评诊断等，这些功能都能帮助学生更好地学习数学；
3．再次，电子书可以随时随地被更新，可以随时跟上中考的最新动态，为考生提供更多最新和最全面的考题。
二、获取八年级上册数学书电子版青岛版的方法
1．首先，学生可以到学校的电脑上去下载，一般情况下，学校都会提
供相关的电子书下载链接，学生只需要点击相应的链接就可以快速下载；
2．其次，学生可以去各大网站上下载，比如淘宝、京东等网站都有提
供电子书下载链接，学生也可以直接到上面去下载，而且付费也很方便；
3．最后，学生可以通过搜索引擎去搜索八年级上册数学书电子版青岛
版的下载链接，一般情况下都可以找到各种免费的下载链接。
从上面可以看出，八年级上册数学书电子版青岛版无疑是可以改进学习方式，提高教学质量的最佳选择，有利于促进数学学科的发展。
2022八上全品作业本英语电子版
2022八上全品作业本英语电子版本试卷共四大题，12页，满分110分。
考试时间120分钟。
注意事项：1.答卷前，考生务必在答题卡上用黑色字迹的钢笔或签字笔填写自己的考生号、姓名、考点考场号、座位号，再用2B铅笔把对应这两个号码的标号涂黑。
2.选择题每小题选出答案后，用2B铅笔把答题卡上对应题目的答案标号涂黑。
如需要改动，用橡皮擦干净后，再选涂其他答案。
不能答在试卷上。
3.非选择题必须用黑色字迹的钢笔或签字笔作答，答案必须写在答题卡各题目指定区域的相应位置上；如需要改动，先划掉原来的答案，然后再写上新的答案，改动的答案也不能超出指定的区域；不准使用铅笔、圆珠笔和涂改液。
不按以上要求作答的答案无效。
4.考生必须保持答题卡的整洁，考试结束，将本试卷和答题卡一并交回。
一、语法选择（共15小题；每小题1分，满分15分）阅读下面短文，按照句子结构的语法性和上下文连贯的要求，从1~15各题所给的A、B、C和D项中选出最佳选项，并在答题卡上将该项涂黑。
Xian Xinghai was a very famous musician in China. He wrote one of the greatest pieces ofmusick of the 20century. In his short life he wrote-1 300 songs and an opera.Xian was vom in panyum, Guangdong, China in 1905. Because his father died before he was born, Xian moved from place to place with-2 mother. He began learning to play_3 violinwhena he was 20 years old. In the beginning, his violin wascheapp and badly made thathem_5 not play it well. His friends laughed at him. Xian did not stop6and soon showedhish talent. In 1934, he was one of the first Chinese students_7 studied in a special musicschooly in Paris. Before he8, Xian became the schools best student9 won severalprizesh for his talents.In 1935, he returned to China and helped fight against the Japanese army. Later, he came tofan’an10music at a college.11there were no pianos in Yan’an at that time Xian stillwrotem12of his most important music there, including The Yellow River, his most famousworks.In May 1940, Xian 13to the Soviet Union by the Chinese Communist Party to writemusick for movies. In the Soviet Union, life was very14. Xian got sick and later died of a lungillnessh15October 30, 1945, aged only 40. Xian’s music, however, lives on in the people’hearts.1. A.near B. nearly C. nearby D.nearer2. A.he B. him C. his D. he’s3. A.a B. an C. the D. this4. A.so B. such C. very D. much5. A.need B. may C.should D. could6. A.practice B.practicing C.to practice D.practised7. A. what B. which C.whom D. who8. A.leave B. leaves C. left D. was leaving9. A.and B. but C. as D. or10. A.teach B.taught C.teaching D. to teach11. A.If B. Although C. When D. Because12. A.any B. little C. fwd. some13. A.sent B. was sent C. has sent D. was sending14. A.hard B. harder C. hardest D. the hardest15. A.at B. in C. on D. by二、完形填空（共10小题；每小题1.5分，满分15分）阅读下面短文，掌握其大意，然后从16~25各题所给的A、B、C和D项中选出最佳选项，并在答题卡上将该项涂黑。
八年级上册英语全品学练考译林版
八年级上册英语全品学练考译林版一、指导思想以“英语课程标准”为宗旨，适应新课程改革的需要，面向全体学生，提高学生的人文素养，增强实践能力和创新精神。
正确把握英语学科特点，积极倡导合作探究的学习方式。
培养学生积极地情感态度和正确的人生价值观，提高学生综合素质为学生全面发展和终身发展奠定基础。
二、学情分析八年级我所带的2个班，共有学生人数91人，其中男生43人，女生47人。
通过七年级的英语学习，大多数学生已能听懂有关熟悉话题的语段和简短的故事。
能与教师或同学就熟悉的话题交换信息。
能读懂短篇故事，能写便条和简单的书信。
但由于各种因素的影响，学生发展参差不齐。
有少数学生因为基础不够好，学习很吃力而，有的因此扰乱课堂次序，这给教学带来不少困难。
三、教学目标学生应有较明确的英语学习动机和积极主动的学习态度。
能听懂教师对有关熟悉话题的陈述并能参与讨论。
能读供七至八年级学生阅读的简单读物和报纸杂志，克服生词障碍，理解大意。
能根据阅读目的运用适当的阅读策略。
能与他人合作，解决问题并报告结果，共同完成学习任务。
能在学习中互相帮助，克服困难。
能合理计划和安排学习任务，积极探索适合自己的学习方法。
在学习和日常交际中能注意到中外文化的差异。
四、教材分析人教版新目标八年级英语上册教材紧紧围绕《英语课程标准》(20)的要求与目标设计和编排教学内容。
section a部分：就是每单元基本的语言内容，著重学生的听闻能力。
1a：著重学生对短语的累积，即为看见图片能写出适当的短语或M18x至更多，相似“brain storming”。
section b部分：是知识的扩展和综合的语言运用。
1a：非常注重学生的个人表达能力和判断力，尊重学生的个人想法，然后在1b中以pairwork形式落实，与同学交流想法。
self—check部分。
单词的实际运用，每单元5个关键单词挑选填空题，再使学生演示造句。
编写者根据教学内容有机地扩散了学习策略、情感态度以及文化意识的培育。
八年级上册全品学练考答案
八年级上册全品学期末达标练考卷答案一、选择题(本大题共12道小题，每小题3分，满分36分)1．2020年太原正式步入“地铁时代”，太原轨道交通近期建设的1、2、3号线在全国是第338条线路．下面是中国四个城市的地铁图标，其中是中心对称图形的是()2．若a＋b＝3，则a2＋6b－b2的值为()A．3 B．6 C．9 D．123．把多项式3(x－y)2＋2(y－x)3分解因式，结果正确的是()A．(x－y)2(3－2x－2y) B．(x－y)2(3－2x＋2y)C．(x－y)2(3＋2x－2y) D．(y－x)2(3＋2x＋2y)4．若分式|x|－2（x－2）（x＋1）的值为0，则x的值为()A．±2 B．2 C．－2 D．－15．一个多边形的内角和与外角和相加之后的结果是2 520°，则这个多边形的边数为()A．12 B．13 C．14 D．156．方程23x＝1x＋2的解为()A．x＝－2 B．x＝4C．x＝0 D．x＝67．某班50人一周内在线学习数学的时间如图所示，则以下叙述正确的是()A．全班同学在线学习数学的平均时间为2.5 hB．全班同学在线学习数学时间的中位数为2 hC．全班同学在线学习数学时间的众数为20 hD．全班超过半数同学每周在线学习数学的时间超过3 h8．若分式方程6（x＋1）（x－1）－mx－1＝6有增根，则它的增根是()A．0 B．1 C．－1 D．1或－19．如图，△ABC沿BC所在的直线平移到△DEF的位置，且C点是线段BE的中点，若AB＝5，BC＝2，AC＝4，则AD的长是()A．5 B．4 C．3 D．210．如图，将线段AB平移到线段CD的位置，则a＋b的值为() A．4 B．0 C．3 D．－511．如图，在▱ABCD中，对角线AC，BD相交于点O，点E是BC的中点，若AB＝16，则OE的长为()A．8 B．6 C．4 D．312．如图，E，F分别是平行四边形ABCD的边AD，BC上的点，且BE ∥DF，AC分别交BE，DF于点G，H.下列结论：①四边形BFDE是平行四边形；②△AGE≌△CHF；③BG＝DH；④S△AGE︰S△CDH＝GE︰DH.其中正确的个数是()A．1 B．2 C．3 D．4二、填空题(本大题共6道小题，每小题3分，满分18分)13．如果a2－2a＝0，则2a2 020－4a2 019＋2 020的值为________．14．使代数式x＋3x－3÷x2－9x＋4有意义的x的取值范围是________．15．一组数据3，2，x，2，6，3的唯一众数是2，则这组数据的方差为________．16．如图，在▱ABCD中，对角线AC与BD相交于点O，且AB⊥AC，∠DAC＝45°，如果AC＝2，那么BD的长是________．17．如图，在平面直角坐标系中，点A(3，0)，点B(0，2)，连接AB，将线段AB绕点A顺时针旋转90°得到线段AC，连接OC，则线段OC的长度为________．18．如图，在▱ABCD中，AB＝6，∠BAD的平分线与BC的延长线交于点E，与DC交于点F，且点F为边CD的中点，DG⊥AE，垂足为G，若DG＝5，则AE的长为________．三、解答题(本大题共7道小题，满分66分)19．(9分)分解因式：(1)x3－x；(2)2a2－4a＋2；(3)m4－2m2＋1.20．(7分)先化简，再求值：1x÷⎝⎛⎭⎪⎫x2＋1x2－x－2x－1＋1x＋1，其中x的值为方程2x＝5x－1的解．21．(8分)某校八年级开展英语拼写大赛，爱国班和求知班根据初赛成绩，各选出5名选手参加复赛，两个班各选出的5名选手的复赛成绩如图所示．(1)根据统计图直接写出上表中a，b，c的值；(2)已知爱国班复赛成绩的方差是70，请求出求知班复赛成绩的方差，并说明哪个班成绩比较稳定．22．(10分)如图所示，已知射线CB∥OA，∠C＝∠OAB＝120°，E，F在CB上，且∠1＝∠2，∠3＝∠4.(1)求∠EOB的度数；(2)若平行移动AB，那么∠OBC：∠OFC是否随之变化？若变化，找出规律或求出其变化范围；若不变，求出这个比．答案一、1.C 2.C 3.B 4.C 5.C 6.B 7．B8．B【点拨】分式方程的最简公分母为(x＋1)(x－1)，去分母得6－m(x＋1)＝6(x＋1)(x－1)．由分式方程有增根，得到(x＋1)(x－1)＝0，即x＝1或x＝－1，把x＝－1代入整式方程得6＝0，无解，则它的增根是1.故选B.9．B【点拨】由平移的性质可知，AD＝BE，∵BC＝CE，BC＝2，∴BE ＝4，∴AD＝4.故选B.10．A【点拨】由题意知，线段AB向左平移3个单位长度，再向上平移4个单位长度得到线段CD，∴a＝5－3＝2，b＝－2＋4＝2，∴a＋b＝4.故选A.11．A【点拨】∵在▱ABCD中，对角线AC，BD相交于点O，∴点O是AC的中点．又∵点E是BC的中点，∴EO是△ABC的中位线，∴EO＝12AB＝8.故选A.12．D【点拨】∵四边形ABCD是平行四边形，∴AD∥BC，AB∥CD，AD＝BC，∵BE∥DF，∴四边形BFDE是平行四边形，故①正确；∵四边形BFDE是平行四边形，∴BF＝DE，DF＝BE，∴AE＝FC，∵AD∥BC，BE∥DF，∴∠DAC＝∠ACB，∠ADF＝∠DFC，∠AEB＝∠ADF，∴∠AEB＝∠DFC，∴△AGE≌△CHF(ASA)，故②正确；∵△AGE≌△CHF，∴GE＝FH，∵BE＝DF，∴BG＝DH，故③正确；∵△AGE≌△CHF，∴S△AGE＝S△CHF，∵S△CHF︰S△CDH＝FH︰DH，∴S△AGE︰S△CDH＝GE︰DH，故④正确．故选D.二、13.2 02014．x≠±3且x≠－415．2【点拨】∵数据3，2，x，2，6，3的唯一众数是2，∴x＝2.∴3，2，2，2，6，3的平均数为16×(3＋2＋2＋2＋6＋3)＝3，则这组数据的方差为16×[(2－3)2×3＋(3－3)2×2＋(6－3)2]＝2.16．25【点拨】∵四边形ABCD是平行四边形，∴AD∥BC，OB＝OD，OA＝12AC＝1，∴∠ACB＝45°.∵AB⊥AC，∴△ABC是等腰直角三角形，∴AB＝AC＝2.在Rt△AOB中，根据勾股定理，得OB＝5，∴BD＝2BO＝2 5.17.34【点拨】如图，作CH⊥x轴于H.∵A(3，0)，B(0，2)，∴OA＝3，OB＝2，∵∠AOB＝∠BAC＝∠AHC＝90°，∴∠BAO＋∠HAC＝90°，∠HAC＋∠ACH＝90°，∴∠BAO＝∠ACH.∵AB＝AC，∴△ABO≌△CAH(AAS)，∴AH＝OB＝2，CH＝OA＝3，∴OH＝OA＋AH＝3＋2＝5，∴OC＝OH2＋CH2＝52＋32＝34.18．8【点拨】∵AE为∠DAB的平分线，∴∠DAE＝∠BAE.∵四边形ABCD 为平行四边形， ∴AD ∥BC ，DC ∥AB ，DC ＝AB . ∵DC ∥AB ，∴∠BAE ＝∠DF A ，∴∠DAE ＝∠DF A ， ∴AD ＝FD . 又∵DG ⊥AE ，∴AG ＝FG ，即AF ＝2AG . ∵F 为DC 的中点，∴DF ＝CF ， ∴AD ＝DF ＝12DC ＝12AB ＝3.在Rt △ADG 中，根据勾股定理得AG ＝2，则AF ＝2AG ＝4. ∵AD ∥BC ，∴∠DAF ＝∠E ，∠ADF ＝∠ECF . 在△ADF 和△ECF 中，⎩⎨⎧∠DAF ＝∠E ，∠ADF ＝∠ECF ，DF ＝CF ，∴△ADF ≌△ECF (AAS)， ∴AF ＝EF ，则AE ＝2AF ＝8.三、19.解：(1)x 3－x ＝x (x 2－1)＝x (x ＋1)(x －1)； (2)2a 2－4a ＋2＝2(a 2－2a ＋1)＝2(a －1)2； (3)m 4－2m 2＋1＝(m 2－1)2＝(m ＋1)2(m －1)2. 20．解：1x ÷⎝ ⎛⎭⎪⎫x 2＋1x 2－x －2x －1＋1x ＋1 ＝1x ÷x 2＋1－2x x （x －1）＋1x ＋1＝1x ·x （x －1）（x －1）2＋1x ＋1＝1x －1＋1x ＋1 ＝2x（x ＋1）（x －1）.解方程2x＝5x－1，得x＝1 3.当x＝13时，原式＝－34.21．解：(1)a＝85；b＝80；c＝85.(2)求知班成绩的方差为15×[(70－85)2＋(75－85)2＋(80－85)2＋2×(100－85)2]＝160.∵70＜160，∴爱国班的成绩比较稳定．22．解：(1)∵CB∥OA，∴∠C＋∠COA＝180°.∵∠C＝120°，∴∠COA＝180°－∠C＝180°－120°＝60°.∵∠1＝∠2，∠3＝∠4，∴∠COA＝2∠1＋2∠4＝2(∠1＋∠4)＝2∠EOB.∴∠EOB＝12∠COA＝12×60°＝30°.(2)不变化．∵CB∥OA，∴∠OBC＝∠2，∠OFC＝∠FOA.又∵∠1＝∠2，∴∠OBC＝∠1，∴∠OFC＝2∠1，∴∠OBC∠OFC＝∠12∠1＝1 2.。