Unit 5 A delicate World 单词学案＋课文学案-2025-2026学年高中英语外研版选择性必修第二册

该高中英语学案聚焦重点词汇、短语及课文语法结构，通过单词语境例句与环保主题课文结合，梳理词汇变形、短语搭配等前备知识，搭建“词汇-语境-主题”学习支架，连接新旧知识脉络。 该资料特色在于词汇解析多维，涵盖释义、例句及变形，语法点结合课文语境分析，助力学生提升语言能力。环保主题渗透文化意识，习题设计注重应用，培养思维品质与学习能力，高效巩固知识。

选择性必修二 Unit5 Developing ideas 【重点单词】 1. halfway a./ad. (在)中间的；中途的，半途的 英语释义：(1) at an equal distance between two points; (2) in the middle of a period of time 例句:①Establish the right relationship at work and you’re halfway there. ②When we reached the halfway point of the project, things began to get more difficult. ③The saleswomen left urgently halfway through the meeting. 2. dramatically ad. 显著地(sudden, great and often surprising);戏剧地 单词变形： a. n. 短语表达：a dramatic increase/fall/change 例句：①The announcement had a dramatic effect on house prices. ②He stretched his arms in a dramatic gesture. ③A fifth year of drought is expected to have dramatic effects on the California economy. ④At speeds above 50 mph, serious injuries dramatically increase. 3. habitat n. （动植物的）生活环境；栖息地 例句：①The panda’s natural habitat is the bamboo forest. ②Habitat assessment and prediction is the base for protection of endangered species. ③Wildlife photographer aim to photograph animals in their natural habitat. 4. appetite n. 胃口，食欲(physical desire for food)；欲望(desire) 短语表达：①develop/have an appetite for ②没胃口 例句：①He suffered from headaches and loss of appetite. ②Our appetite for new products also contributes to the problem. ③The patient in the ward has an appetite for food today. 5. multiply v. (使)大量增加，(使)倍增；乘 加减乘除： 短语表达：①multiply the risk of… ②to suffer multiple injuries 例句：①The children are already learning to multiply and divide. ②2 multiplied by 4 is/equals/makes 8. ③Cigarette smoking combines with other factors to multiply the risks of cancer. ④It is possible to multiply these bacteria in the laboratory. ⑤These creatures can multiply rapidly. ⑥He died of multiple injuries. 6. chaos n. 大混乱；紊乱 短语表达：①in chaos ②economic/political/traffic chaos 例句：①The battlefield near the boundary was in chaos after the battle. ②A serious road accident caused traffic chaos yesterday. ③The city was in chaos after the earthquake. 7. conservation n. 保护; 节约 单词变形： v. 同义词： 短语表达：①wildlife/energy conservation ②the conservation of fuel/old buildings 例句：①Conservation of water is of vital importance. ②There is a need for the conservation of trees, or there will soon be no forests. ③Ecotourism is a type of tourism that conserves the environment. ④The factories have closed for the weekend to conserve energy. 8. virus n. 病毒 细菌： 短语表达：①the flu virus ②a virus infection 例句:①There are diverse virus, ranging from the flu virus to the SARS. ②An unknown virus has just attacked my computer. 9. decrease v.（使）减少，（使）变少；n. 减少；减少量 同根词： 同义词： 短语表达：①decrease to/by/in ②price/tax/wage decreases ③in the decrease 例句：①The average rainfall has decreased by around 30 percent. ②This species of bird is decreasing in numbers every year. ③People planted trees on the waste hills to decrease water and soil loss. ④There has been some decrease in military spending this year. ⑤There has been a steady decrease of/in temperature. ⑥As a result of habitat improvement, the penguin’s population has been on the increase significantly. 10. trap n. 陷阱，夹子；圈套；困境v. 使陷入困境；夹住 过去式、分词/现在分词： 短语表达：①set/lay/place a trap for mice ②fall into/get out of a trap ③be trapped in=be / in 被困在…… ④the unemployment trap 例句：①Solar panels trap energy from the sun. ②They were trapped in the burning building. ③The escaped prisoners were eventually trapped in an underground garage and recaptured. ④Because of the greenhouse effect the Earth is warmed by gases trapped in the atmosphere. 11. departure n. 离开；启程；出发 单词变形： v. 反义词： 短语表达：the departure time/gate 例句：①The time for my departure from Japan was drawing nearer. ②His sudden departure threw the office into chaos. ③The bad weather delayed the (depart) of the ship. 12. explode v. 爆炸; 突然增加 单词变形： n. a. 短语表达：①explode a bomb ②explode with anger/laughter 例句:①There was a huge bang as if someone had exploded a rocket outside. ②The explosion was caused by a burst gas pipe. ③When he heated it, the container exploded, leaving Wilson blind. 13. collapse vi./n. ①倒塌(to fall down or fall in suddenly) ② fall down and being unconscious, because you are very sick ③ break down; to fail suddenly or completely 短语表达：①collapse suddenly ②collapse with a heart attack ③economic collapse 例句：①The roof of the cafeteria collapsed under the weight of snow. ②In November 2016, Huang collapsed and was rushed to hospital, where he was diagnosed with cancer. ③When I get home I like to collapse on the sofa and listen to music. ④She arrived home exhausted and barely capable of showering before collapsing on her bed. ⑤Lots of people lost their jobs when property market collapsed. ⑥Why Maya civilization collapsed remains a mystery. ⑦The walls were strengthened to protect them from collapse. 14. incident n. 事件(something unusual or unpleasant that happens) 近义词： 短语表达：①a serious/violent incident ②the July 7th Incident of 1937 例句：①There was a shooting incident near here last night. ②Not long ago, an incident that happened at the park touched me greatly. ③There was a serious incident involving a group of youths. 15. owe vt. 欠(债); 应该做，应给予，欠(情)；应该把……归功于 英语释义：(2)to feel that you ought to do sth for sb or give them sth, because they have done sth for you (3)to exist or be successful because of the help or influence of sb/sth 短语表达：①owe sb. sth.=owe sth. to sb. ②欠某人一个解释/道歉 ③owe it to sb. to do sth. ④owe one’s success to… ⑤owing to=due to 例句：①She still owes her father $3,000. = ②They have denied they owe money to the company. ③My teacher is such a great soul, to whom I owe many thanks. ④I owe it to him to explain what happened. ⑤I always suspected she owed her first job to her friendship with Tom. ⑥He owes his good health to his regular life. ⑦Owing to bad weather, the flight was delayed for a couple of hours. 16. nutrient n. 养分，营养物 变形: nutrition n.营养(学) nutritional 营养的 nutritious 有营养的 短语表达：①poor nutrition ②nutritional value 例句：A balanced diet provides nutrition for your body. 17. comparison n. 比较 单词变形： vt. 近义词： 短语表达：①by/in comparison (with) ②把A和B相比较 ③compare A to B 例句：①It is difficult to make a comparison with her previous book—they are distinct. ②The amount of carbon dioxide released by human activities such as burning coal and oil is small in comparison. ③He was a loud friendly man. By/In comparison, his brother was shy. ④ (compare) with the cold outside, a warm house is a better choice for me. 18. visual a. 视觉的，视力的 同根词： 短语表达：①visual pollution/effects ②the visual field(the field of vision) 例句：I have a very good visual memory. 19. session n. 一段时间；开庭期，会期；学年 英语释义：(1)a period of time that is spent doing a particular activity (2)a formal meeting or series of meetings of a court 短语表达：a photo/recording/training session 例句：①After two late night sessions, the Security Council has failed to reach agreement. ②The Arab League is meeting in emergency session today. 20. mysterious a. 神秘的 单词变形： n. 短语表达：①a mysterious incident/the ~ disappearance ②remain a mystery 例句：By opening a novel, I can leave behind my burdens and enter into a wonderful and mysterious world where I am a new character. 21. status n. 身份，地位 短语表达：社会地位 例句：①The party was denied legal status. ②She achieved celebrity status overnight. ③Nurses are undervalued, and they never enjoy the same status as doctors. 22. criterion n. 标准，准则，原则 同义词： 复数： 例句：①What criteria are used for assessing a student’s ability? ②They award a green label to products that meet environmental criteria. ③The most important criterion for entry is that applicants must design and make their own work. 23. rare a. 稀有的，罕见的 单词变形： ad. 反义词： 短语表达：a rare species/disease/occurrence 例句：The FDA has approved a new treatment for a rare blood disorder. 24. apparently a. 显然(obviously) 例句：①He paused, apparently lost in thought. ②The child nodded, apparently content with the promise. ③It was apparent from her face that she was really upset. ④For no apparent reason, the train suddenly stopped. 选择性必修二 Unit5单词 2 学科网（北京）股份有限公司 25. vast a. 巨大的；辽阔的 同义词： 短语表达：a vast amount of information 例句：①In the vast majority of cases, this should not be a problem. ②She once ruled over a vast empire. ③He stared out at the vast emptiness that was the sea. 26. variation n. 变化; 差别(a change or slight difference in amount or level) 单词变形： v. n. a. a. 短语表达：regional/seasonal variation 例句：①A variation of a gene can influence people’s social behavior. ②The survey found a wide variation in the prices charged for canteen food. ③There is considerable variation in tastes across the country. 27. endangered a. 濒危的，濒临灭绝的 短语表达：①an endangered species ②保护濒危物种免于灭绝 例句：①The debate could endanger the proposed Mideast peace talks. ②You can catch their arrival in the Hong Kong Wetland Park, with (endanger) species making appearances. 28. secure a. 安全的，可靠的；稳固的；安心的；vt. 使安全；获得 单词变形： n. insecure a. 不安全的 短语表达：①a secure job/income ②to secure a contract ①Information must be stored so that it is secure from accidental damage. ②They are working to ensure that their market share remains secure against competition. ③She finished the match, secure in the knowledge that she was through to the next round. ④The team managed to secure a place in the finals. 29. greeting n. 问候；祝词 短语表达：Christmas/birthday greetings 例句：They exchanged greetings and sat down to lunch. 【识记单词】 1. heritage n. 遗产；传统 *2. inhabitant n. 栖居的动物 3. penguin n. 企鹅 *4. rat n. 大老鼠 5. subsequently ad. 后来，随后 subsequent a. previous/prior/former (反) *6. vegetation n. 植物；草木 *7. erosion n. 侵蚀 *8. parakeet n. 长尾小鹦鹉 *9. immunity n. 免疫力 10. substantial a. 大量的；重大的（considerable） 短语：a substantial change/breakfast 例句：①Substantial numbers of people support the reforms. ②The research provided substantial evidence. 11. intervention n. 干涉，介入 短语：military intervention *12. postscript n. 附言 *13. pest n. 害虫 14. ecology n. 生态 ecosystem n. eco-friendly a. ecotourism n. *15. dissolve v. (使)溶解 *16. herbal a. 用香（药）草制成的 herb n. 药草，香草 *17. prosper v. 兴旺，发达 18. biological a. 生物的，与生物有关的 19. *altitude n. 海拔（高度） 20. *thrive v. 茁壮成长 21. fossil n. 化石 living fossils/fossil fuel *22. floral a. 花的 *23. vertebrate n. 脊椎动物 *24. beehive n. 蜂房，蜂箱 25. elsewhere ad. 在别处；到别处 例句：The answer to the problem must be sought elsewhere. *26. invasion n. 涌入 *27. coexist v. 共存，共处 【短语】 on behalf of sb. =on sb.’ behalf代表 英语释义：as the representative of sb or instead of them 例句：①On behalf of the department I would like to thank you all. ②She made an emotional public appeal on her son’s behalf. 【Para.1】 1. The green grass and bare rock of its landscape contrast dramatically, giving it a wild and natural beauty. bare: not covered with or protected by anything 短语：the bare branches of winter trees bare shelves barely: just possible but only with difficulty; almost does not happen or exist 例句：①We barely had time to catch the train. ②Anastasia could barely remember the ride to the hospital. ③ It was 90 degrees and the air conditioning barely cooled the room. 2. Nor would they fail to imagine how its native inhabitants, including royal penguins, king penguins, and elephant seals, existed in perfect harmony with their natural habitat for thousands of years. 句子结构：（主干） 否定词位于句首的部分倒装：(1)否定副词：never、seldom、hardly、rarely、little、barely等 (2)否定短语：at no time、in no way、by no means、on no account、under no circumstances等 例句：①Never have I seen such a beautiful sunset. ②Hardly did he sleep last night because of the noise. ③At no time should you give up your dreams. ④Under no circumstances will I approve that plan. ⑤Not only did he study hard, but also he was very generous to others. 【Para.2】 tragedy n. 1. It’s a tragic story that began in 1810 when humans arrived on the island. 句子结构：（主干） 2.These small animals quickly took over the island, eating the birds’ eggs and attacking baby birds. 句子结构：（主干） take常见短语：①Reporters took down every word of his speech. ②The plane took off an hour late. ③He took off my wet boots and made me sit by the fire. ④No other organization was able or willing to take on the job. ⑤She decided that I was the ideal person to take over the job. ⑥Fish take in oxygen through their gills. ⑦He takes up his duties next week. ⑧I took up my position by the door. 【Para.3】 Loose on the island, they did what rabbits do best—they multiplied rapidly and began eating the native vegetation and digging holes, which caused soil erosion. 句子结构：（主干） loose: not firmly held or fixed in place; not tied together; free to move around without control 例句：①Check that the plug has not come loose. ②She usually wears her hair loose. ③The potatoes were sold loose, not in bags. ④The sheep had got out and were loose on the road. 【Para.4】 n. Experts felt it necessary to come up with a plan to remove all the rabbits from the island. 句子结构：（主干） 【Para.5】 1. It turned out that they developed an immunity to the virus, and their numbers exploded once again. 句子结构：（主干） turn out (to be): to be discovered to be; to prove to be 例句：①It turned out that she was a friend of my sister. ②The job turned out to be harder than we thought. ③The house they had offered us turned out to be a tiny apartment. ④Cosgrave’s forecast turned out to be completely wrong. ⑤His lack of experience may prove to be his failure. 2. This incident made it clear that the rat, mouse and rabbit problem needed solving once and for all. 句子结构：（主干） 【Para.6】 They have been trained to find every last one, without harming the native animals. (1)every last=every single 短语：every last word/detail 例句：①I sat in the front, took notes and even recorded every single word he said in class, but in vain. ②Like all great events, kindness begins slowly, with every single act. (2)without在语法填空中的考查： 例题：①There is this unconscious way that many people engage humor thinking about it. ②(2023新高考I卷)The best Xiao long bao have a fine skin, allowing them to be lifted of the steamer basket tearing or spilling any their contents. 选择性必修二 Unit5 Understanding ideas 学科网（北京）股份有限公司 【Para.1】 变形： 1. It is my great pleasure to give a lecture here on behalf of the Be at One with Nature Association. associate: ①I always associate the smell of baking with my childhood. ②These symptoms are particularly associated with migraine headaches. 【Para.2】 1. Is it its forests that stretch on and on like green seas?(that made it onto the UNESCO World Heritage…) stretch: ①The exercises are designed to stretch your leg muscles. ②The town’s history stretches back to before 1500. ③The beach stretches for over four miles. 2. Is it the legendary father of Chinese herbal medicine, Shennong, after whom the park is named? (1)介词前置（介词＋关系代词）引导的定从：①This is the factory in my father works. ②The man to you spoke just now is our manager. (2)以……命名：This model, named Xun Zi, one of the most celebrated philosophers in China… 3. Or is it the mysterious creature called “Yeren”(wild man) that has captured the imagination of the the world? capture(catch): ①The army shot down one aeroplane and captured the pilot. ②The images were captured by TV crews filming outside the base. ③The animals are captured in nets and sold to local zoos. ④The attack was captured on film by security cameras. ⑤The great names of the past usually capture the historian’s attention. 【Para.3】 It is also one of the rare locations in the world where scientists can observe in real time the ecological and biological processes that occur as the plants and animals develop and evolve. n. 句子结构：（主干） real time: To make the training more realistic, the machine operates in real time. 【Para.4】 The vast range in altitude results in a great variation in climate conditions. result: ①These policies resulted in many elderly people suffering hardship. ②Job losses results from innovation in production. 【Para.5】 account for This represents more than ten per cent of China’s total floral richness. represent: ①This contract represents 20% of the company’s annual income. ②This decision represents a significant departure from previous policy. 【Para.6】 过去式/过去分词： 1. In winter, scientists brave heavy snow and freezing temperatures to supply food to the Golden Snub-nosed Monkey. brave: to deal with sth difficult to achieve sth ①He did not want to brave the journalists at the airport. ②Over a thousand people braved the elements (= went outside in spite of the bad weather) to attend the march. 2. Thanks to their efforts, the monkey’s population has doubled since the 1980s. double: ①Membership almost doubled in two years. (vi.) ②Double all the quantities in the recipe to make enough for eight people. (vt.) 【Para.7】 1. What is special about the honey is that it is produced by the earliest species of Chinese bee. 句子结构：（主干） 2. Although endangered elsewhere in China due to the invasion of foreign species, the bees of Shennongjia have coexisted with the local people for centuries. 句子结构：（主干） 3. By providing the bees with a secure home, the villagers collect their honey in return. (1)in return: Can I buy you lunch in return for your help? (a way of thanking or paying sb for sth they have done) I asked her opinion, but she just asked me a question in return. (a response or reaction to sth) The children called out their names in turn. (2)in turn: Increased production will, in turn, lead to increased profits. (as a result of sth in a series of events) The children called out their names in turn. (one after the other in a particular order) 【Para.8】 All of this explains why Shennongjia earned—and deserves—its place on the UNSECO World Heritage List, as well as highlighting how understanding, awareness and hard work have contributed towards protecting a unique and wonderful part of our natural world. 句子结构：（主干） $