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外研版（2019）选择性必修第四册Unit 5 Into the UnknownDeveloping ideas教材分析：本节课是外研版2019年选择性必修第四册Unit 5的内容，主要涉及到"Into the Unknown Developing ideas"这个主题。
教材包括单元导入部分的幻灯片和视频，主要阅读材料为一篇关于创新科技的文章，以及相关的语言点和练习。
教学目标：通过本节课的学习，学生应能够：1. 熟练运用关于创新科技的词汇；2. 掌握文章的主要内容和结构，提取关键信息；3. 训练阅读理解和提取信息的能力；4. 培养学生的创新思维和表达能力。
教学重点：重点是让学生熟练运用关于创新科技的词汇，以及理解文章的主要内容和结构。
教学难点：难点是帮助学生提高阅读理解能力，让他们能够准确提取文章中的关键信息。
学情分析：学生是高二的学生，已经具备一定的英语基础。
他们对科技和创新科技的内容比较感兴趣，但对于理解复杂的文章以及提取关键信息的能力可能还有待提高。
教学策略：为了激发学生的兴趣和参与度，可以采用互动式的教学策略，如小组讨论、问题导向等。
同时，根据学生的学习情况，可以适当调整教学内容和节奏。
教学方法：本节课可以采用多种教学方法，如听说训练、阅读训练、语法讲解等。
在阅读训练环节，可以引导学生通过快速阅读和详细阅读的方式理解文章，并利用相关练习提高他们的阅读理解和提取信息的能力。
在语法讲解环节，可以结合实际例子来进行说明和练习，以帮助学生理解课堂上的难点。
导入环节（约5分钟）：教学内容：通过图片和视频导入，激发学生对“未知世界”的好奇心。
教学活动：1. 准备一些与“未知世界”相关的图片和视频素材，如探险家、深海生物等。
2. 展示这些图片和视频，并问学生：你有没有听说过这些事物？你知道它们的故事吗？3. 引导学生自由发言，分享自己对这些事物的了解和想法，并激发他们对未知世界的兴趣。
(2019外研版)高中英语选择性必修四※※※Unit 5 Into the unknown※※※(一）Unit 5知识点一、词汇派生1.civilise v.文明化；教化→civilisation n.文明→civilised adj.文明的2.ruin n.残垣断壁，废墟→ruinous adj.毁灭性的→ruinously adv.毁灭地3.dismiss v.拒绝考虑，否定→dismissal n.摒弃；不予考虑→dismissive adj.轻蔑的4.abandon v.离弃，逃离→abandoned adj.被离弃的；被遗弃的→abandonment n.离弃；遗弃二、一词多义1.bury v.①The house was buried under ten feet of snow.（覆盖）②She's 85 and has buried three husbands.（丧失）③He had learnt to bury his feelings.（掩藏）④He walked slowly，his hands buried in his pockets.（插入）2.abandon v.①He gave the order to abandon the ship.（舍弃）②They abandoned the match because of rain.（中止）③Critics accused him of abandoning his principles.（放弃）④This is a baby ab andoned by its parents.（遗弃）三、知识要点1.correspond v.相一致；符合；类似于；相当于；通信Your account of the event does not correspond with/to hers.你对事情的陈述与她说的不相符。
The two maps of London correspond closely.这两张伦敦的地图很相似。
外研版选择性必修四Unit5 Into the unknown背诵积累学案班级：________ 姓名：___________ 外研版选择性必修四Unit1 Looking forwards背诵积累检测Ⅰ.请根据原文填空，注意词汇、语法的恰当形式。
1._____________ Maya civilisation from a very young age, 15-year-old Canadian William Gadoury thought hehad _________________ from his study of ancient star charts.2.Based on this, he believed he had _________ an unknown Maya city _______________the jungle.3.So while you may ________________ check out a strange object or to test the waters of a new situation, it canbe safer to steer clear of the unfamiliar.4.Facts such as these add to the mystery surrounding Maya civilisation, ___________________ find out why itdisappeared...5.Of course exploration doesn't have to mean _________________________________ the unknown and it'snever wrong to ________________ before taking action.Ⅱ.请根据语义补全句子。
Unit 5 Space and beyond 语法-精讲破名词性从句包括主语从句、表语从句、宾语从句和同位语从句。
一. 名词性从句的连接词（一）that【观察】That he is still alive is sheer luck John said that he was leaving for London on Wednesday.The teacher told the students（that）they should hand in their homework the next day and that the homework must be signed by their parents.The fact that he has fully recovered makes me happy.【归纳】1. that只起①作用，引导名词性从句，在从句中不作任何成分，也没有词义。
2. that在引导名词性从句时，在以下情况中，that不宜省略：（1）that引导的主语从句位于②时，that不可省略。
（2）当动词后带有多个that引导的宾语从句时，第一个that可以省略，而其他的that ③省略。
（3）当that引导的宾语从句前有it作形式宾语时，that不可省略。
（4）that引导的从句作介词的宾语时，that不能省略。
（5）引导表语从句和④语从句时，that一般不可省略。
(二) whether/if【观察】Whether there is life on the moon is an interesting question.The question is whether she should have a low opinion of the test.Everything depends on whether we have enough money.【归纳】l. if/whether引导的名词性从句是由一般疑问句或选择疑问句转化而来的，whether与if表示“⑤”，只起连接作用，引导从句，在从句中不作任何成分。
外研版（2019）选择性必修第四册Unit 5 Into the UnknownStarting out本节课的教材分析：本节课所使用的教材是外研版（2019）选择性必修第四册Unit 5 Into the Unknown Starting out。
本单元主要介绍了两位维京人的冒险，通过他们的冒险旅程，学生将了解不同文化之间的交流和互动。
教材包括了一个短文和相关的课堂讨论问题。
教学目标：1. 知识目标：通过本节课的学习，学生能够了解维京文化与其他文化的差异，并探讨不同文化之间的相互影响。
2. 能力目标：培养学生的阅读理解能力，能够通过阅读短文获取关键信息，并运用其内容展开讨论与思考。
3. 情感目标：激发学生对于探索未知的兴趣，培养学生的勇于冒险和接触不同文化的能力。
教学重点：1. 学习掌握关于维京文化的相关知识。
2. 培养学生的阅读理解能力及其运用能力。
3. 培养学生的跨文化交流与理解能力。
教学难点：1. 解读和理解短文中的文化差异。
2. 培养学生的世界观和文化差异意识。
学情分析：学生是高二学生，具备较为扎实的英语基础知识，能够通过阅读短文获取关键信息。
他们具备一定的跨文化交流能力，但对于维京文化可能了解较少。
学生对于新奇的事物具有浓厚的兴趣并且愿意接受挑战。
教学策略：1. 激发学生的兴趣：通过提出引人入胜的问题和情境，引起学生的好奇心和学习兴趣。
2. 合作学习: 设计合作学习活动来促进学生之间的交流与合作，培养学生的跨文化交流能力。
3. 实践性教学：通过学生实际操作或互动参与，让他们亲身体验不同文化之间的差异和交流。
教学方法：1. 阅读理解训练：通过阅读理解练习，训练学生的阅读理解能力，提高学生获取关键信息的能力。
2. 分组讨论：将学生分成小组，让他们就短文中的问题展开讨论，培养学生的合作与交流能力。
3. 视听教学：使用相关的视听资料，让学生更加直观地了解和感受维京文化，激发学生的学习兴趣。
导入环节（约5分钟）：教学内容：引入课题和激发学生的学习兴趣。
Unit5 Into the unknown 结构-情景破知识点1 with的复合结构It contained more than 800 characters，with some signs representing animals. （教材P50）它包含800多个符号，一些符号代表动物。
情景导学Do you know the lady with a baby in her arms？你认识那位抱婴儿的女士吗？With him taken good care of，we all felt quite relieved.他被照顾得很好，我们都感到很欣慰。
With a lot of homework to finish，I have no time to go shopping with you.由于有许多家庭作业要做，我没有时间与你一起去购物归纳拓展with的复合结构通常在句中作状语或定语，常见形式为：①with+名词/代词+形容词/副词/______词短语②with+名词/代词+______（主动、进行）③with+名词/代词+______（被动、完成）④with+名词/代词+______（动作尚未发生）链接高考单句语法填空1-1（2019课标全国I，完形填空，★★☆）Does Kilimanjaro deserve its reputation as a crowded mountain with lines of tourists ______（ruin）the atmosphere of peace? 1-2（2019北京，语法填空A，★★☆）On the first day of my first grade，I stood by the door ______ butterflies in my stomach.完成句子1-3（2017浙江，阅读理解B，★★☆）布朗大学医学院睡眠研究员Mary Carskadon 博士说：“更多的儿童开着电视睡觉，还有更多的保持清醒的机会，有更多的家庭作业、互联网和手机。
外研版（2019）选择性必修第四册：Unit5 Into the unknown单元基础知识检测-Part 1: Blanks filling:1.Some told tales of____they had helped them survive during bad weather.(限训6)2.He got up slowly, leaving the lunch_________(finish).3.Any_____who would like _______ to become an assistant in our company should send us an ________ before December.(apply)4.The man _______(dig) out some gold from the canal, but he wondered where ______(bury) it.5.The old photos _________(bury) at the bottom of the suitcase reminded me of those happy times.6.We take ______ for granted that theory must _________(apply) to practice.7.Recently he has been applying himself to _________(assist) his professor in the development of new equipment.8.At the entrance to the hospital, I was surprised to see a baby girl _________(abandon) by her parents.9.Shortly after suffering from a massive earthquake and being reduced to ________(ruin), the city took _____ a new look.10.Don’t leave her________(wait) outside in the rain.11.I have a lot of trouble ______(make) myself ________(understand).12.This newness just left me _________(want) more.13.Does Kilimanjaro deserve it reputation as a crowded mountain with lines of tourists ________(ruin) the atmosphere of peace?14.__________(bury) his face in his hands, he tried to control his weeping.15.She applied _______ the international school ______ a job as an English teacher.16.As fewer people send letters to one another, the number of people collecting stamps has been steadily _____ decline.17.A large amount of money ________(be) spent on the equipment of the new gym so far.rge amounts of my pocket money ________(spend) buying new books last year.19.You must attend the lecture on time if ________(inform) of it.20.You will find yourself upset by traffic jams if _______(live) in the center of the city, especially during the rush hour.21.Suzhou is notable ______ its beautiful gardens, _______ attract a large number of tourists.22.If more people join in the trend to ride bicycles to work then the air quality will be improved _______(notable).23.The ________(fascinate) of the game lies in trying to guess what your opponent is thinking.24.Despite the recession, the company is confident of further _________(expand).25.Yuan Longping searched for a way to increase rice harvests without __________(expand) the area of the fields.26.He stood on the sidewalk with his hands ________(bury) in the pockets of his dark overcoat.27.______ his peak, the writer was able to produce up to 10 novels a year.28.This affects their nervous systems and ability ________(produce) baby birds, and can lead ______ kidney failure and death.29.Waseda University, which is familiar ______ the Chinese people, has a long relationship with China.30.________(give) that he apologized to me, I forgave him finally.Part 2: Sentence translation:1..当她意识到发生了什么的时候，她双手掩面而泣。
Unit 5 Into the unknown词汇积累①intrigue v．（因奇特或神秘而）激起……的兴趣，引起……的好奇心②make a discovery做出发现；发现③comparison n．比较；对比；相比④correspond to相当于；相符合⑤be based on...以……为基础⑥spot n．斑点；污迹v．看见；发现⑦dismiss v．拒绝考虑，否定⑧extend v．使伸长；扩大；扩展⑨impressive adj.令人赞叹的；令人敬佩的impression n．印象impress v．使钦佩；使敬仰；给……留下深刻的好印象⑩representative adj.典型的；有代表性的n.代表；销售代表⑪extraordinary adj.意想不到的；令人惊奇的⑫apply A to B 把A应用到B⑬accurate adj.正确无误的；精确的accuracy n．准确(性)；精确(程度)⑭character n．(人、集体的)品质，性格；(地方的)特点，特性；(事物、事件或地方的)特点，特征，特色⑮syllable n．音节⑯interpret v．诠释；说明⑰primitive adj.原始的；远古的⑱abandon v．离弃，逃离⑲decline v．减少，衰弱；谢绝；婉言拒绝⑳take back退回；退还；归还；收回，撤回(所说的话或想法)○21claim v．宣称；声称；断言；要求(拥有)；索取；认领；索要○22collapse v．(突然)倒塌，坍塌；(尤指因病重而)倒下，昏倒，晕倒；(尤指工作劳累后)坐下，躺下放松○23conflict n．冲突；争执○24indicate v．表明；显示；象征○25play a part in 贡献力量；起……作用○26landscape n．(陆上，尤指乡村的)风景，景色○27unknowingly ad v.未意识到地；不知不觉地；无意中○28lead to 导致；通向○29far 修饰形容词的比较级○30be likely to do sth.可能做某事○31at different rates以不同的速度○32fall into ruin毁灭；毁坏○33meanwhile＝at the sLame time ＝in the meanwhile 与此同时1．civilise v．文明化；教化→civilisation n．文明→civilised adj.文明的2．ruin n．残垣断壁，废墟→ruinous adj.毁灭性的→ruinously ad v.毁灭地3．dismiss v．拒绝考虑，否定→dismissal n．摒弃；不予考虑→dismissive adj.轻蔑的4．abandon v．离弃，逃离→abandoned adj.被离弃的；被遗弃的→abandonment n．离弃；遗弃1．bury v．将……埋在下面，覆盖；埋葬，安葬，丧失；掩藏(感情等)；使陷入，把……插入①The house was buried under ten feet of snow. 覆盖②She's 85 and has buried three husbands. 丧失③He had learnt to bury his feelings. 掩藏④He walked slowly，his hands buried in his pockets. 插入2．abandon v．离弃，逃离；遗弃，抛弃；舍弃；中止；放弃(信念等)①He gave the order to abandon the ship. 舍弃②They abandoned the match because of rain. 中止③Critics accused him of abandoning his principles. 放弃④This is a baby abandoned by its parents. 遗弃Words and Phrases知识要点1correspond v．相一致；符合；类似于；相当于；通信[教材P50]Through comparison，he found that the locations of the 117 known Maya cities correspond to the positions of the stars.通过比较，他发现117个已知玛雅城市的位置与恒星的位置相对应。
外研版（2019）选择性必修第四册Unit 5 Into the UnknownUsing language本节课的教材分析：《外研版（2019）选择性必修第四册Unit 5 Into the Unknown Using language》是高中英语课本中的一节课，该节课主要介绍了一些科幻电影的简介和相关信息。
课文主要包括科幻电影的定义和特点以及两部不同类型的科幻电影《The Day the Earth Stood Still》和《Inception》的简介和分析。
教学目标：1. 知识与能力目标：学生能够通过学习本节课的内容，掌握科幻电影的定义、特点以及学习如何对科幻电影进行评价和分析的相关词汇和表达方式。
2. 过程与方法目标：培养学生通过阅读、听说、写作等多种方式获取和交流信息的能力。
3. 情感态度价值观目标：培养学生的科学精神和创新思维，激发学生探索未知领域的兴趣。
教学重点：1. 学习科幻电影的定义和特点。
2. 学习如何评价和分析科幻电影。
3. 学习如何使用相关词汇和表达方式来描述科幻电影。
教学难点：1. 学生对科幻电影的个人观点进行表达。
2. 学生对科幻电影的特点进行分析和评价。
3. 学生掌握科幻电影相关的词汇和表达方式。
学情分析：学生在高二阶段，已经掌握了一定的英语基础知识，并且对于科幻电影这一主题也有一定的了解。
但是对于科幻电影的特点和评价可能还不太熟悉。
学生大多数是对科幻电影比较感兴趣的年轻人，具有较强的好奇心和探索精神。
教学策略：1. 激发学生的兴趣：通过引入一些有趣的科幻电影片段或者图片，激发学生对科幻电影的兴趣。
2. 合作学习：组织学生进行小组合作学习，共同探讨科幻电影的特点和评价，并互相交流意见和观点，培养学生的合作能力和思考能力。
3. 多媒体教学：结合多媒体资源，如PPT、视频等，进行教学，提供直观的展示和音频的声音让学生更好地理解和记忆。
教学方法：1. 听说训练：通过听取和讨论科幻电影相关内容，提高学生在听和说方面的能力。
I.阅读单词认读01.pyramid n.02.canal n.03.tropical adj.04.cyclone n.05.megadrought n.06.downfall n.07.getaway n.08.subdue v.09.the unknown10.uncharted adj.11.delve v.12.shipwreck n.13.archaeological adj.14.coral n.limetre n.16.barreleye n.17.upwards adv.18.trench n. 海19.equivalent adj.20.stack v.21.furthermore adv.22.vessel n.23.vol(＝volume) n.II.重点单词识记01.__________ v. (因奇特或神秘而)激起……的兴趣, 引起……的好奇心02.__________ v. 将……埋在下面03.__________ n. 残垣断壁, 废墟04.__________ v. 拒绝考虑, 否定05.__________ v. 后退; 离开; 退避06.__________ v. 退缩, 畏缩07.__________ n. 物质III.核心词汇拓展01.__________ n. 文明(社会) →__________ v. 使文明; 使有教养→__________ adj. 文明的02.__________ n. 天文学→__________ n. 宇航员03.__________ v. 离弃, 逃离→__________ adj. 被抛弃的; 废弃的04.__________ n. 扩大; 增加→__________ v. 扩大; 增加05.__________ n. 调查→__________ v. 调查; 研究; 审查06.__________ adj. 显要的; 显著的; 值得注意的→__________ v. 注意07.__________ n. 钻探; 勘探→__________ v. 钻孔; 打眼; 操练IV.核心短语速记01.(因无人照料而)衰落, 败落02.逃跑, 逃走03.逃命04.调查, 检查05.试水, 试探06.避开……; 从……处脱身07.动身踏上(漫长的)旅途08.积极投入到……中去09.再三考虑, 慎重考虑10.避免做, 不愿做11.调查(问题)12.与……相符/一致13.把……应用于……14.on top of15.达到顶峰16.提供了解……的一扇窗17.超出……的能力之外01.policy n. 政策02.polish vt. 磨光; 修改; 润色03.portable adj. 手提的, 便携式的04.positive adj. 积极的05.possibility n. 可能, 可能性06.postpone vt. 使延期07.precious adj. 珍贵的08.prejudice n. 偏见09.presentation n. 描述, 陈述; 介绍10.pressure n. 压迫; 压力; 压强11.previous adj. 以前的; 早先的12.primary adj. 初等的; 初级的01.It contained more than 800 characters, with some signs representing animals, people and objects andothers representing syllables. (with复合结构)它包含800多个字符, 一些符号代表动物、人和物体, 另一些符号代表音节。
Unit5 Into the unknown 知识-清单破I. 核心单词（A）写作词汇一写词形1. ______ n. 文明（社会）2. ______v. 将……埋在下面3. ______n. 运河4. ______n. 残垣断壁，废墟5. ______ν. 离弃，逃离6. ______ν. 拒绝考虑，否定7. ______adv. 此外；而且；不仅如此8. ______n. 物质(B)阅读词汇一明词义1. intrigue v. _______2. pyramid n. _______3. astronomy n. _______4. tropical adj. _______5. cyclone n. _______6. megadrought n. _______7. downfall n. _______8. getaway n. _______9. retreat v. _______10. subdue v. _______11. uncharted adj. _______12. delve v. _______13. shrink v. _______14. Shipwreck n. _______15. coral n. _______16. millimetre n. _______17. barreleye n. _______18. upwards adv. _______19. trench n. _______20. equivalent adj. _______21. stack v. _______22. notable adg. _______23. vessel n. _______24. vol n. _______(C)拓展词汇—灵活用1. _______adj. 神秘的，难以解释的→_______ n. 神秘；神秘的事物→_______n. 神话；神话故事2. _______n扩大，增加→_______ v. 扩大，膨胀，发展3. _______n. 调查→_______ν. 调查4. _______adj. 考古学的；考古的→_______n. 考古学家5. _______n. 钻探；勘探→_______v. 钻孔，训练Ⅱ. 重点短语1. __________和……相一致/相符合2. be based on __________3. __________把……运用于4. __________除……之外5. so far __________6. __________多得多；更加7. __________在鼎盛时期8. __________（因无人照料而）衰落，败落9. lead to__________10. a series of__________11. __________逃跑，逃走12. __________逃命13. __________试水，试探14. __________避开…，从…处脱身15. __________不为人知的地方，人类尚未到达的地方16. __________动身踏上旅途17. __________积极投入到…中去18. __________再三考虑，慎重考虑19. __________避免，畏避20. __________调查21. set sail__________22. up to__________23. be known as__________24. in addition__________25. be equivalent to__________26. __________保持纪录27. beyond the reach of__________Ⅲ. 经典结构1. 它包含800多个符号，一些符号代表动物……It contained more than 800 characters, ______ ______ ______ ______ ______. . . . . .2. 它是一种如此复杂的书写系统，以至于到目前为止，还没有人能够完全解释它It was a writing system ______ ______ ______, so far，no one has been able to interpret it completely.3. 玛雅社会在技术上是原始的这个事实使得它的成就更加难以置信和神秘。
The fact ______ ______ ______ ______ ______ ______ makes its achievements all the more incredible and mysterious.4. 这可能导致了一系列的旱灾，每次持续数年，包括公元900年左右的“大旱灾”This is likely to have led to a series of droughts, ______ ______ ______ ______ ______ ______ ______ includin g a “megadrought” around 900 AD.5. 不管出于什么原因，玛雅文明基本上消失在了丛林深处。
______ ______ ______, Maya civilisation largely disappeared within the deep jungle.6. 它曾经辉煌的城市都毁于一旦，给后人留下了各种各样的谜团待解决。
Its once-great cities fell into ruin, ______ ______ ______ ______ ______ ______ ______ ______.7. 据估计，全球水下有300万艘沉船。
Lying under waters across the globe ______ ______ ______ ______ ______ ______.8. 他们提出理由说，更有可能的是，文明起源于北纬30度，因为那里的气候普遍温暖、潮湿。
______ ______ ______, they argue, ______ civilisations arose on the 30th parallel north because the climate there is generally warm and wet.Ⅳ. 长难句分析1. What is most extraordinary about these complex structures is how they were built without the use of wheels，metal tools or even animal power.分析：本句为主从复合句。
What is most extraordinary about these complex structures 为What引导的______从句；how they were built without the use of wheels metal tools or even animal power为how引导的______从句。
句意：这些复杂的结构最不寻常的地方在于，它们是如何在没有使用轮子、金属工具甚至动物力量的情况下建造起来的。
2. Many scientists believe that these droughts were the main reason why Maya civilisation began to collapse at different rates in different places.分析：本句为主从复合句。
that these. places为that引导的______从句，该从句中又包括_______从句why Maya civilisation began to collapse at different rates in different places，修饰先行词______。
句意：许多科学家认为，这些旱灾是玛雅文明开始在不同地区以不同速度崩溃的主要原因。
3. In these waters，more than 200 metres deep where light cannot reach. are extraordina creatures that appear as if they are straight out of science fiction.分析：本句为主从复合句。
where light cannot reach为where引导的_______从句；that appear as if they are straight out of science fiction that引导的______从句；as if they are straight out of science fiction为as if引导的______从句。
句意：在这些水深超过200米、光线无法到达的水域中，有奇特的生物，它们看起来就像是直接从科幻小说中跳出来的。
V. 必备语法Review：noun clauses复习：名词性从句1. Although his theory has been dismissed by scholars it shows ______ powerful the secrets of Ancient Maya civilisation are among people.2. But the greatest mystery of all is ______ caused the Maya to abandon most of their great cities.3. ______Maya civilisation collapsed remains a mystery.参考答案：I.(A)1. civilisation 2. bury 3. canal. 4. ruin 5. abandon 6. dismiss 7. furthermore 8. substance（B）1. 激起……的兴趣，引起……的好奇心 2. 金字塔 3. 天文学 4. 来自热带的；产于热带的 5. 气旋；旋风 6. 超级干旱7. 衰败8. 逃跑，逃走9. 后退；离开；退避10. 克制，抑制（情绪）11. 地图上没有标明的12. 探索，探究13. 退缩，畏缩14. 失事的船；沉船15. 珊瑚16. 毫米17. 管眼鱼18. 向上，朝上19. 海沟20. 等同的；等值的；相当的21. （使）整齐地堆起摞起22. 显要的；显著的；值得注意的23. 船；舰24. （书的）卷，册(C)1. mysterious; mystery; myth 2. expansion; expand 3. investigation investigate 4. archaeological archaeologist 5. drilling drillⅡ. 1 correspond to 2. 基于……,以…为基础 3. apply. to. 4 on top of 5. 到目前为止，迄今为止 6. all the more 7 at sb. ’S/sth. ’s peak 8. fall into ruin 9. 导致10. 一系列1. make a getaway 12. run for ones life 13. test the waters 14. steer clear of 15. the unknown 16. set out 17. throw oneself into 18. think twice 19. shrink from 20. look into 21. 启航22. （数量或数目）多达23. 作为……而出名24. 另外，此外25. 与…相当26. hold a record27无法达到；超出的能力之外III. 1. with some signs representing animals2. so complicated that3. that Maya society was technologically primitive4. each lasting for a couple of years5. whatever the reasons6. leaving various mysteries for later people to solve7. are an estimated three million shipwrecks8. It's more likely：thatⅣ1. 主语；表语 2. 宾语；定语；reason 3. 定语；定语；表语V. 1. how 2. what 3. Why。
