Unit 3 Be Active and Healthy!（一）-2026-2027学年高中英语教材全解必修二（冀教版）

Unit 3 Be Active and Healthy! 教材全解（一） nowadays sedentary beer sufficient illustrate shock 。单元核心词汇 diabetes button engine rural transportation boxing champion escape lung oxygen ignore 。单元同步语法 动词不定式 ⑦单元文章对话 重点句型讲练 教材同步词汇全解全练 重点1 单元词汇 l.sedentary/'sedntri/adj.久坐不动的；惯于久坐的 词形变化：无常见变形，但可派生副词sedentarily 搭配：sedentary lifestyle久坐不动的生活方式；sedentary work伏案工作 辨析：与inactive近义，但sedentary强调长时间坐着；反义词active 例句：A sedentary lifestyle can lead to many health problems, 2.sufficient/ss'fnt/adj.足够的；充分的 词形变化：sufficiency(m.)足够；sufficiently(adv.）足够地 搭配：be sufficient for对…足够；sufficient sleep充足的睡眠 辨析：enough语气更强，可作定语或表语；sufficient更正式，多用于书面 例句：We need sufficient evidence to support the argument. 3.illustrate/lostrert/v.说明；阐明；给…加插图 词形变化：illustration(m.)说明；插图；illustrative(adj.)说明性的 搭配：illustrate the point说明观点；an illustrated book有插图的书 辨析：explain侧重解释原因或过程；illustrate常通过例子或图表使清晰 例句：The teacher used a diagram to illustrate how the engine works. 4.shock /fpk/v.使震惊；使震动n.震惊；冲击 词形变化：shocked(adj.）震惊的；shocking(adj.)令人震惊的 搭配：be shocked at/y对…感到震惊；electric shock电击 辨析：surprise程度较轻；shock强调强烈的意外甚至恐惧 例句：The news of his sudden death shocked everyone. 5.ignore /ig'n:(r)/v.忽视；不理会 词形变化：ignorance(n.）无知；ignorant(adj.)无知的 搭配：ignore the warning忽视警告；ignore sb..不理睬某人 辨析：neglect侧重疏忽职责；ignore有故意不理会之意 例句：You can't ignore the fact that smoking harms your lungs.. 6.reduce'dju:s/v.减少；降低；缩小 词形变化：reduction(n.)减少；reducible(adj.)可减少的 搭配：reduce costs降低成本；reduce to减少到；reduce by减少了 辨析：decrease常指数量或程度下降；reduce更强调人为主动使变小 例句：We must take action to reduce air pollution. 7.prevent /pr'vent/v.阻止；预防 词形变化：prevention(n.）预防；preventable(adj.)可预防的 搭配：prevent sb.from doing sth..阻止某人做某事；prevent disease预防疾病 辨析：stop较口语化；prevent强调事先阻止或防止发生 例句：Regular exercise can prevent many health problems. 8.aerobics/ea'reubrks/n.有氧运动 词形变化：aerobic(adj.）有氧的；anaerobic(adj.)无氧的 搭配：do aerobics做有氧操；aerobic exercise有氧运动 辨析：与anaerobic exercise（如举重)相对；泛指提高心肺功能的运动 例句：Doing aerobics regularly helps improve your lung capacity,. 9.ural/'rerl/adj.乡村的；农村的 词形变化：urally(adv.)乡村地；urality(n.)乡村特性 搭配：ural area农村地区；ural life乡村生活 辨析：countryside指具体的乡村景色；ral更强调地域性质，与urban相对 例句：More and more people are moving from rural to urban areas. l0.escape /I'skerp/n.&v.逃跑；逃脱；逃避 词形变化：escapee(n.)逃犯；escapist(m.)逃避现实者 搭配：escape from从…逃脱；escape reality逃避现实；a narrow escape九死一 生 辨析：f1ee强调匆忙逃离；escape更强调成功脱离危险或束缚 例句：He managed to escape from the burning building. 11.tissue/m:/n.（人、动植物的)组织；纸巾 词形变化：tissue paper薄纸；tissue culture组织培养 搭配：muscle tissue肌肉组织；facial tissue面巾纸 辨析：在生物学中指组织；日常生活中指纸巾，注意与napkin(餐巾)区别 例句：Smoking can damage the lung tissue. l2.slim/slm/adj.苗条的；纤细的v.变苗条 词形变化：slimmer(n.)减肥者；slimming(adj.h.）减肥的/减肥 搭配：slim chance机会渺茫；slim down变苗条；减少 辨析：hin偏瘦，可能不健康；lim含褒义，指体态匀称 例句：She is trying to slim down by doing aerobics every day. 考点通关 单元词汇 (一)单句填空（用所给词的适当形式填空） 1.A (sedentary)lifestyle increases the risk of diabetes. 2.The food is not (sufficiency)for the whole family. 3.Could you please (illustration)how this machine works? 4.The audience were (shock)by the sudden explosion. 5.Don't (ignorance)the early signs of lung disease. 6.We should take steps to (reduction)the amount of waste. 7.Washing hands can help (prevent)the spread of disease. 8 (aerobic)is a great way to improve heart and lung function 9.Many young people prefer city life to (urally）life. 10.The prisoner tried to (escape)from the prison last night. 11.The (tissue)in our body need oxygen to function properly. 12.She looks much (slim)after three months of exercise. 13.He was shocked the news of his friend's accident. 14.The government is building new roads to connect rural areas cities. 15.A healthy diet,combined with exercise,can help you keep (slim). Do you know that a 1. lifestyle is harmful?Many people today sit for long hours,which is not 2. for health.To 3. this,let me give you an example:sitting all day can 4. your body and lead to 5. and heart problems.However,you can 6. these risks by doing 7. regularly.Even simple activities like walking can help 8. the danger.Don't 9. the importance of moving around.If you live in a 10. area,you have more chances to be active outdoors.Try to 11. from the habit of sitting too long.A 12. body and healthy 13. are the rewards of an active life. 参考答案 (一)单句填空 1.sedentary;2.sufficient;3.illustrate;4.shocked;5.ignore;6.reduce;7.prevent 8.Aerobics;9.rural;10.escape;11.tissues;12.slimmer;13.at/by;14.to;15.slim (二)短文填空 1.sedentary;2.sufficient;3.illustrate;4.shock;5.diabetes;6.prevent;7.aerobics; 8.reduce;9.ignore;10.rural;11.escape;12.slim;13.tissues 教材同步语法全解全练 重点1 动词不定式 动词不定式 项目 内容 定义 动词不定式是一种非谓语动词形式，由“to+动词原形”构成（有时可省 略o)。它在句中不能单独作谓语，但可以充当多种句子成分，表示目的、 结果、原因等。 to+动词原形（否定式：not to+动词原形） 基本结构 例：to study,not to give up To learn a foreign language is important. 作主语 ★常用it作形式主语：It is important to learn a foreign language. 跟动词后：I hope to see you soon. 作宾语 常见动词：want,decide,plan,hope,wish,afford,fail,refuse等。 作表语 My dream is to become a teacher. 通常放在被修饰名词后，表示将来的动作。 I have a lot of work to do 作定语 注意：不定式与被修饰词之间是动宾关系时，若不定式中的动词是不及物 动词，需加介词。 例：a pen to write with 目的状语：Hle went there to see his friend.. 作状语 结果状语：He woke up to find everyone gone. 原因状语：I am sorry to hear that.. 动词+宾语+todo:ask/tell/want/wish/allow/expect/force/encourage sb to do sth 感官动词和使役动词(see,watch,hear,notice,make,let,have)后接不带 作宾语补足语 to的不定式（即动词原形作宾补）。 I saw him leave.(不带to) 但在被动语态中，to必须恢复：He was seen to leave.. 疑问词+不定Idon't know what to do next. 式 Can you tell me how to get there? decide to do,manage to do,pretend to do afford to do,agree to do,fail to do 常见固定搭配 would like to do,used to do,be supposed to do It's adj.for/of sb to do 考点通关 动词不定式 语法专练一：单项选择(8题) 1.I don't know to solve this problem. A.what B.how C.which D.where 2.He made me the car. A.wash B.to wash C.washing D.washed 3.It's very kind you to help me. A.for B.of C.to D.with 4.The teacher told us noise in class. A.not make B.not to make C.don't make D.to not make 5.My ambition is an astronaut. A.become B.becoming C.to become D.became 6.She failed the exam last time. A.passes B.pass C.to pass D.passing 7.We have no choice but on. A.go B.going C.to go D.went 8.I'm considering abroad for further study. A.go B.to go C.going D.gone 语法专练二：语法填空（10题) 阅读下面句子，在空白处填入适当的内容(1个单词)或括号内单词的正确形式。 1.It's necessary for us a second language. 2.The doctor advised my father up smoking. 3.We saw a little girl in the corner. 4.She pretended me when I passed by. 5.The first thing I did was my parents. 6.He is too young after himself. 7.I have a lot of homework tonight. 8.They stopped a rest because they were very tired. 9.I would appreciate it if you could teach me how this machine. 10.The man was made ten hours a day. 语法综合练习 (一)单项选择（共10题） 1.The only way success is to work hard. A.to B.of C.for D.with 2.I always tell my brother in the river;it's dangerous. A.not swim B.not to swim C.don't swim D.to not swim 3.What made you so angry? A.feel B.to feel C.feeling D.felt 4.She is old enough herself. A.dress B.dressing C.to dress D.dressed 5.We are planning a picnic this weekend. A.have B.having C.to have D.had 6.He ran all the way the early bus. A.catch B.to catch C.catching D.caught 7.I haven't decided which university A.go B.to go C.going D.goes 8.My job is children English. A.teach B.taught C.to teach D.teaching 9.The box is too heavy for me A.carry B.to carry it C.to carry D.carrying 10.She was heard an English song in the next room. A.sing B.to sing C.singing D.sang (二)语法填空（共10空) 用括号内动词的适当形式填空（可能需用不定式、动名词或原形）。 1.It is hard that he failed the exam. 2.I would like you to my birthday party. 3.He expects his students on time. 4.They have no choice but for the next train. 5.Can you show me how this machine? 6.The thief was caught the wallet. 7.Please remember the door when you leave. 8.She is easy along with. 9.Let's shopping together. 10.We consider him the best candidate. 参考答案 语法专练一：单项选择 1.B;2.A;3.B;4.B;5.C;6.C;7.C;8.C 1.to learn;2.to give;3.crying;4.not to see;5.to call;6.to 语法专练二：语法填空 look;7.to finish;8.to have;9.to use;10.to work 语法综合练习（一） 1.A;2.B;3.A;4.C;5.C;6.B;7.B;8.C;9.C;10.B 1.to believe;2.to invite;3.to arrive;4.to wait;5.to 语法综合练习（二） operate;6.stealing;7.to lock;8.to get;9.go;10.to be 教材同步文章句型精讲 重点句型 Global Public-health Problem 1.Sitting,reading,watching television,playing video games...are harmful to our health. 结构：V-ing形式+谓语动词 中文：坐、阅读、看电视、玩电子游戏…对我们的健康有害。 用法：表示一个动作或行为在句中作主语；单个动名词短语作主语时谓语用单数，多 个并列则用复数。 2.Physical inactivity is believed to cause millions of deaths a year 结构：主语+am/is/are+过去分词+(by.…) 中文：身体缺乏运动被认为每年导致数百万人死亡。 用法：表示主语是动作的承受者；It is believed that...是常见结构。 3.Physical inactivity is believed to cause millions of deaths a year-almost as many as smoking. 结构：as+adj./adv.+as 中文：身体缺乏运动被认为每年导致数百万人死亡一一几乎和吸烟一样多。 用法：as many as+可数名词复数；as far as等。 4.People are used to pressing the button to start the engine. 结构：介词+V-ing/名词 中文：人们习惯于按按钮来启动发动机。 用法：介词后接动名词；注意区分be used to doing和sed to do。. 5.Such a lifestyle is so harmful that it causes many diseases. 结构：such(+a/an+adj.)+n.+that+从句 中文：这样的生活方式如此有害以至于导致许多疾病。 用法：such...that...和so.that..的区别；that引导结果状语从句。 6.In Britain, "couch-potato"lifestyles cost the health service more than fl billion a year. 结构：倍数/数量+比较级+than 中文：在英国，“沙发土豆”生活方式每年给医疗服务造成超过10亿英镑的损失。 用法：more than+数字；twice/three times as many..as..等。 ...it doesn't matter if they are living in a rich or a poor country 结构：It doesn't matter+连接词(if/whether//wh-word)+从句 中文：…不管他们生活在富裕国家还是贫穷国家，这都无关紧要。 用法：形式主语句型，真正主语是后面的从句。 考点通关 文章句型 练习一：完成句子（用所给词的适当形式填空) 1. (sit)for too long every day can cause health problems. 2.Physical inactivity (link)to many diseases like diabetes and cancer. 3.Many teens are used to (spend)hours playing video games 4.One day,Sujata's children were on the edge of (develop)Type 2 diabetes. 5.It doesn't matter (if)they are in a rich country or a poor one. 6.In rural areas,modern transportation is (replace) walking. 7. (walk)home every day may help you avoid illnesses 8.Such simple and easy ways to keep fit seem to (ignore). 9.You do not need to become a champion in order (get) the benefits of exercise. 10.The problem is so serious that we have to take action (immediate). 练习二：翻译句子（在横线上写出完整句子） 1.久坐不动的生活方式对健康有害。 2.缺乏足够的体育锻炼被认为是导致许多疾病的原因。 3.看电视和玩电脑太多了，以至于他们没有时间运动。 4.人们不是走路去上班，而是习惯于开车。 5. 我从未想过这样的事会发生在自己孩子身上。 6.大约三分之一的青少年每天花三个多小时看电视或玩电脑。 7.这种健康问题在发达国家和发展中国家一样普遍。 8.做家务和爬楼梯是简单有效的锻炼方式。 9.在未来，我们需要做出更多努力来应对这一情况。 10.无论你住在城市还是农村，缺乏运动都是一个严重的问题。 参考答案 1.Sitting;2.is linked;3.spending;4.developing;5.whether; 练习一：完成句子 6.replacing;7.Walking;8.be ignored;9.to get;10.immediately 练习二：翻译句子 1.A sedentary lifestyle is harmful to our health.;2.Lack of enough physical activity is believed to cause many diseases. 3.They spend so much time watching TV and playing computer games that they have no time for exercise.4.Instead of walking to work,people are used to driving.;5.I never thought it would happen to my own children.;6.Nearly one third of teens spend more than three hours a day watching TV or using the computer.; 7.This health problem is as common in developed countries as in developing countries.8.Doing housework and climbing stairs are simple and effective ways to exercise.;9.In the years to come, we need to make more efforts to deal with the situation.;10.It doesn't matter whether you live in a city or in the countryside;lack of exercise is a serious problem. 教材同步单元练习 一、阅读理解 Passage A For decades,the message to office workers has been clear:sitting for prolonged periods is harmful.Now, a growing body of research is taking this a step futher,suggesting that even a daily workout may not fully counteract the negative effects of a sedentary workday.This has led scientists to coin a new term: “active sitting?”. Active sitting involves making small,frequent movements throughout the day to break up long periods of stillness.This can be as simple as shifting your weight in your chair,tapping your feet,or using an unstable surface like a balance ball or a wobble stool.The theory is that these micro-movements engage your core muscles,improve blood circulation,and maintain metabolic activity. A key study by the University of Texas found that people who performed fidgeting-like movements while sitting for six hours had better blood sugar responses after a meal compared to those who sat still.The constant muscle contractions,even if tiny,help the body process glucose more efficiently and bumn extra calories.However,scientists caution that active sitting is not a replacement for traditional exercise.It is a supplement,a way to make the hours we are forced to sit less damaging. The workplace is beginning to adapt.Some companies are introducing adjustable desks that allow for standing or perching,but many of these still lead to static postures.The real focus is now ondynamic seating"-chairs that intentionally lack stability,forcing the user to constantly readjust.These chairs can increase energy expenditure by up to 20%compared to a standard office chair. Yet,critics argue that the evidence is still limited.Most studies are small,and the long-term health benefits of active sitting are not yet fully proven.They wory that people might use it as an excuse to reduce actual physical activity.Professor Philip Bishop,a health researcher,notes,"The best posture is your next posture.We need to build a culture of movement,not just find a more comfortable way to sit still.The goal should be to sit less and move more,not to sit better." ()1.What is the main idea of the passage? A.Traditional exercise is becoming less important for health B.Small,frequent movements while sitting can improve health C.Office workers should replace sitting with standing workstations. D.Scientists have found a way to make sitting as healthy as exercise. ()2.According to the University of Texas study,active sitting can help A.build stronger muscles B.reduce the need for sleep C.manage blood sugar levels D.replace the need for a daily workout ()3.The underlined word"counteract"in paragraph 1 is closest in meaning to A.increase B.explain C.reduce the effect of D.be the same as ()4.What is Professor Philip Bishop's attitude towards "active sitting'? A.He strongly supports it as a cure for sedentary lifestyles B.He believes it is a better solution than traditional exercise. C.He is cautious and warns it should not replace real movement. D.He is confident that it will transform the workplace completely. Passage B In the small,rural villages of central India,a quiet health revolution is taking place,led not by doctors,but by a fleet of trained grandmothers.This program,designed to combat the rising tide of non-communicable diseases like diabetes and hypertension,recognizes a crucial point:healthcare advice is more likely to be followed when it comes from a trusted community member. The grandmothers,affectionately called"Arogya Didis"Health Sisters),are taught to use a simple, illustrated flip chart.One side shows a picture of a person munching on fried snacks,looking tired and lethargic.The other side depicts a person climbing a tree or walking to the market,looking energetic.The message is simple:a lack of sufficient physical activity,paired with a poor diet,leads to a sedentary lifestyle that"eats away at your energy."They use local metaphors to illustrate concepts ofhealth, comparing clogged arteries to a village inigation channel blocked by silt. The impact has been remarkable.Women like Sumitra,a 40-year-old mother of three,initially ignored the advice."I used to think,I do all the housework,I walk to get water,why do I need extra exercise?""she recalls.After a visit from an Arogya Didi,she learned the difference between "activity for survival"and "exercise for health."She now walks an extra 30 minutes a day and reports feeling much less tired. The program doesn't just focus on exercise.It also provides simple,actionable advice on reducing salt and sugar intake.The Arogya Didis use a shocking fact to get their point across:"One spoon of sugar in your tea is like inviting a silent enemy into your body."By using language that is culturally relevant and easy to understand,they are effectively reducing the ignorance surrounding basic health practices in these isolated rural areas. This community-based approach is being studied by global health organizations as a model for preventing the global public-health problem of physical inactivity.It shows that prevention does not always require high-tech solutions;sometimes,the most effective tool is a trusted neighbor with a simple story to tell. ()1.What is the main purpose of the"Arogya Didis"program? A.To train doctors to work in rural areas. B.To provide free medical treatment for the poor C.To use trusted locals to promote healthy lifestyles. D.To illustrate the dangers of fiied snacks and sugar. ()2.What was Sumitra's first reaction to the advice about extra exercise? A.She was shocked by the new information. B.She thought her daily chores were enough. C.She immediately started walking an extra hour. D.She believed she was too old to start exercising. ()3.How does the program help people understand health risks? A.By showing them shocking pictures of diseases B.By using simple stories and local comparisons. C.By explaining the medical reasons for diseases. D.By giving them scientific facts and research data. ()4.Why is this program considered a potential global model? A.It is a low-cost approach that works in communities. B.It relies on advanced medical technology C.It focuses on treating diseases after they appear. D.It is the most effective way to treat diabetes. 二、完形填空 Sujata was a busy mother who worked from home.Like many,she led a(1) lifestyle,spending most of the day glued to her computer screen.She knew she should exercise but felt she never had(2) time.One day,her young son complained of constant thirst and fatigue.A visit to the doctor(3) her:her son was on the edge of developing Type 2 diabetes. "I was (4) ,"she recalled."I never thought it would happen to my own child."The doctor explained that a lack of sufficient physical activity was a major cause.He didn't tell her to join a gym Instead,he (5) simple changes:walking home from school instead of driving,and using stairs instead of the elevator. Determined to(6) this health crisis,Sujata made these changes a family rule.At first,her children complained.They were used to (7) time on video games.Sujata didn't (8) their complaints.She turned it into a game."Let's see who can spot the most dogs on our walk,"she would say To her surprise,the family started to enjoy the walks.They talked more.They noticed the changing seasons.The "forced"activity became a welcome(9) from the boredom of sedentary work. Within months,the whole family felt more energetic.A later check-up showed her son's blood sugar levels had retumned to normal. Sujata's story (10) a simple truth:small moves can make a big difference.We don't need to be champions to get the benefits of exercise.What we need is to break the habit of a sedentary life and find joy in moving.It's a powerful lesson that can (11) a global public-health problem. 1.A.active B.sedentary C.rural D.healthy 2.A.sufficient B.extra C.wasted D.limited 3.A.treated B.ignored C.shocked D.prevented 4.A.excited B.satisfied C.shocked D.amused 5.A.ignored B.illustrated C.reduced D.suggested 6.A.cause B.accept C.escape D.prevent 7.A.spending B.saving C.killing D.wasting 8.A.escape B.reduce C.illustrate D.ignore 9.A.cause B.escape C.shock D.tissue 10.A.ignores B.illustrates C.reduces D.shocks 11.A.cause B.create C.address D.ignore 三、阅读短文回答问题 Read the passage and answer the following questions in complete sentences The term"couch potato"was first used in the 1970s to describe people who spend a lot of time sitting on a sofa watching television.Today,this term has evolved to represent a much wider global public-health problem:physical inactivity.With the rise of technology and modem transportation,people in both developed and developing countries are moving less than ever before A key factor in this trend is the nature of modern work.Many jobs that once required manual labor have been replaced by desk jobs.People are used to pressing a button to start an engine or using a remote to change the channel.This lack of movement,combined with easy access to high-calorie food,has created a perfect storm for health problems.It doesn't matter if you live in a rural area or a bustling city,the decline in physical activity is universal. However,the solution isn't necessarily to run a marathon.Short bursts of activity,like a brisk 10-minute walk after a meal,can significantly improve how your body processes sugar.Doing housework,climbing stairs,or even fidgeting can contribute to your daily energy expenditure.The key is to break up prolonged periods of sitting.By making small,conscious efforts to move more,we can escape the grips of a sedentary lifestyle and drastically reduce the risk of chronic diseases. 1.What lifestyle does the term"couch potato"refer to? 2.According to the passage,what are two major causes of the modemn trend of physical inactivity? 3.Does the problem of physical inactivity only exist in wealthy,developed countries? 4.What kind of physical activity does the passage suggest can help improve health? 5.Why is it important to "break up prolonged periods of sitting"? 四、短文填空（词汇运用) 在空白处填入1个适当的单词（用所给词的正确形式或固定搭配填空，部分词汇可能取自本单元 重点词表)。 A1. (sedentary)lifestyle is a major global health concemn.To 2. (illustration）this problem,consider that a lack of 3. (sufficient)physical activity is now linked to millions of deaths a year,almost as many as smoking.Many people 4. (ignore)the warnings,5. (shock)only when a health crisis hits their family. The good news is that we can take simple steps to 6. (prevention)these risks.For example,7. (do)housework or climbing stairs are easy ways to add movement.Some people find activities like 8. (aerobic)or brisk walking helpful.In 9. (rurally)areas,people can walk more instead of using transport. These small changes can be a welcome 10. (escape)from the boredom of a 11. (slim)workday.By moving more,we can protect our body's 12. (tissue)from damage and live a healthier life.Remember,you can 13. (reduction)your risk of disease by being active. 2. 3. 4. 6. 7. 8. 9. 10. 11. 12. 13. 五、写作 假设你是李华，你的英国笔友Jack来信说他最近感到疲惫、精力不集中，医生建议他改变久坐 不动的生活方式(sedentary lifestyle)。请给他写一封回信，内容包括： 1.对他的情况表示理解； 2.提出至少两条具体的建议（如日常小运动、改变习惯等）： 3.鼓励他坚持健康的生活方式。 要求： 1.词数100-120左右； 2.可以适当增加细节，以使行文连贯； 3.开头和结尾已给出，不计入总词数。 Dear Jack, I was sorry to hear about your health problems,but I'm glad you are taking steps to change. Yours, Li Hua 参考答案 PassageA:1.B 2.C3.C4.C 一、阅读理解 Passage B:1.C2.B3.B 4.A 二、完形填空1.B,2.A,3.C4.C,5.D,6.D;7.A,8.D;9.B,10.B,11.C 1.It refers to a lifestyle where people spend a lot of time sitting and being inactive. 2.The two major causes are the rise of technology and modern transportation. 三、阅读短文3.No,it is a universal problem that exists in both developed and developing countries. 回答问题 4.It suggests short bursts of activity,such as a brisk 10-minute walk after a meal. 5.It is important because it can help the body process sugar and reduce the risk of chronic diseases 四、短文填空1.sedentary2.illustrate3.sufficient4.ignore5.shocked6.prevent7.doing8.aerobics (词汇运用)9.1ral10.escape11.sedentary12.tissues13.reduce 五、写作 范文： Dear Jack, I was sory to hear about your health problems,but I'm glad you are taking steps to change.I completely understand how a sedentary lifestyle can affect you.It's a common problem,but the good news is that small changes can make a big difference. First,ty to break up your sitting time.For example,set a timer to stand up and walk around your room for five minutes every hour.You could also walk or cycle to school instead of taking the bus.Second, try to do some simple exercises,like a 10-minute walk after dinner.Even doing a few stretches can help you feel more energetic. Don't give up!These small actions will help you feel better and prevent future health issues.I believe you can develop healthier habits. Yours, Li Hua