Unit 5 Period Ⅰ Starting out & Understanding ideas-【高中必刷题】2024-2025学年新教材高中英语选择性必修第一册同步课件（外研版2019）

英语 选择性必修 第一册 WY 1 选择性必修第一册 Unit 5 Revealing nature 2 01 Period Ⅰ Starting out & Understanding ideas Part Ⅰ Vocabulary & Grammar 3 在空白处填入1个适当的单词或括号内单词的正确形式。 1.We naturally associate the name of Darwin with the theory of _________ （evolve）. evolution 解析 句意为：我们很自然地将达尔文的名字与进化论联系在一起。设空处作介词of的宾语，此处指“进化论”，应用名词。故填evolution。 2.Fifty workers will be included in a 12-month trial （试验）, who will use a smartphone app to record the _____________ （distant） they travel each day. distance 解析 句意为：共50名工作人员将参与这次为期12个月的试验，他们将使用智能手机应用程序记录自己每天行进的距离。设空处作动词record的宾语，其前有定冠词the，故填distance。 刷单句填空 4 3.Grain Buds, the 8th solar term of a year, means that the ______ （seed） from the grain are becoming full but are not ripe. seeds 解析 句意为：小满是一年中的第八个节气，意味着谷粒正变得饱满但尚未成熟。that引导宾语从句，设空处作该从句的主语，根据从句谓语are becoming可知，此处应用名词复数形式。故填seeds。 4.Shops were crowded _____ customers looking over the colourful displays. with 解析 句意为：商店里挤满了顾客，他们看着这些五颜六色的陈列品。be crowded with… 为固定搭配，意为“挤满……；充满……”。故填with。 5.I’m only worried about his attitude to the job. His ability is not ___ question. in 解析 句意为：我只是担心他对这份工作的态度。他的能力是毋庸置疑的。in question为固定短语，表示“有疑问；不确定；讨论中的”。故填in。 刷单句填空 5 6.Nowadays, cycling is regarded ___ one of the best all-round forms of exercise. as 解析 句意为：如今，骑自行车运动被认为是最好的全能运动形式之一。regard… as… 为固定搭配，意为“认为……是……”。故填as。 7.The caves date back ___ early Viking times in about 800 CE. to 解析 句意为：这些洞穴可以追溯到大约在公元800年的维京时代早期。date back to为固定搭配，意为“追溯到”。故填to。 8.Police arrested over 13,000 people suspected ___ illegally collecting, stealing and purchasing personal data. of 解析 句意为：警方逮捕了13,000多名涉嫌非法收集、窃取和购买个人数据的人。suspect sb of （doing） sth意为“怀疑某人（做）某事”，为固定搭配。 刷单句填空 6 9.We spent an hour or two in class learning how ___________ （generate） the codes, and in the end everything got easier. to generate 解析 句意为：我们在课堂上花了一两个小时学习如何生成代码，最后一切都变得更容易了。此处是“疑问词+不定式”结构作动词learning的宾语。故填to generate。 10.He made a speech ___ wonderfully that everyone present at the conference admired him. so 解析 句意为：他作了如此精彩的演讲，以至于出席会议的每个人都很钦佩他。设空处修饰副词wonderfully，根据句中的that可知，设空处应填so，构成so… that句型，意为“如此……以至于”。 刷单句填空 7 【易混辨析】so… that与such… that的区别 （1）so… that 引导结果状语从句的结构为： so+形容词/副词+that从句 so+形容词+a/an+可数名词单数+that从句 so+many/few+可数名词复数+that从句 so+much/little（少）+不可数名词+that从句 如：He had so little experience that it was not easy for him to solve the problem.他经验太少，对他来说解决这个问题不那么容易。 （2）such… that引导结果状语从句的结构为： such+ a/an+形容词+可数名词单数+that从句 such+形容词+可数名词复数/不可数名词+that从句 such+a lot of/lots of+可数名词复数/不可数名词+that从句 如：This is such an interesting book that we all enjoy reading it.=The book is so interesting that we all enjoy reading it.这本书非常有趣，我们都喜欢看。 刷单句填空 8 根据提示补全句子。 1.做所有事情的第一步都是要把身体调节到最佳状态。 （the first… to do； adjust） _____ _____ _____ ___ ____ __________ ___ ______ _____ ______ ___ the peak state. The first step to do everything is adjust your body to 2.这家超市商品种类繁多，能满足不同消费者的需求。（variety） The supermarket has ___ __________ _______ ___ ______, which can meet the needs of different consumers. a large/wide variety of goods 3.宣纸，被称为文房四宝之一，最早出现于唐朝时期的宣州。（exist） Xuan paper, known as one of the Four Treasures of the Study, first ______ ___ _____ in Xuanzhou prefecture in the Tang Dynasty. came to exist 刷单句表达 9 4.他给了我发挥我的才能的机会，这使我更有信心。（chance） ____ _____ ____ ______ _______ ___ ____ ____ ___________, which made me feel more confident. He gave me the/a chance to use my talent（s） 5.在同学们的欢呼声中，他第一个到达终点。（with复合结构； cheer for） ______ _______ __________ _________ ____ _____, he became the first to get to the finishing line. With his/the classmates cheering for him 解析 此处为“with+宾语+宾补”复合结构，his classmates与cheer for之间为逻辑上的主动关系，应用现在分词作宾补。 刷单句表达 10 阅读下面短文，在空白处填入1个适当的单词或括号内单词的正确形式。 There was a good chance for a young man 1. . （call） Charles Darwin. He was promised to profit from the visit to distant countries yet little known. He 2. . （attract） by rocks, plants and animals. So he started 3. . journey on the ship, the Beagle, to study various living things in their natural environments. A question came to his mind: how did different species come to exist? He found some species of animals were similar to each other. Maybe they evolved as they adapted 4. . the changing environments. This idea inspired him 5. . （search） for more evidence. called was attracted a to to search 刷课文改编填空 11 When the ship arrived on the Galápagos Islands in 1835, Darwin noticed a 6. . （different） between the finches on each island. It seemed their beaks 7. . （evolve） according to what food could be found on that particular island. Over time, they had slowly evolved into many new species. So he believed that new species of plants and animals evolved from earlier ancestors.8. . （final）, Darwin explained this theory in his book On the Origin of Species, 9. . was not published until 1859.This book immediately caused a storm. People were shocked, but Darwin’s scientific studies were so convincing that more and more people believed his theory. Nowadays, the book has become one of the 10. . （important） works ever written, which has changed ideas about life on Earth forever. difference had evolved Finally which most important 刷课文改编填空 12 1.______ called 解析 call与a young man之间为逻辑上的被动关系，故设空处应用过去分词作后置定语。 2._____________ was attracted 解析 此处讲述的是过去的事情，应用一般过去时；attract与He之间为被动关系，应用被动语态。 3.___ a 解析 journey在文中第一次出现，泛指“一次旅行”，journey的发音以辅音音素开头，其前应用不定冠词a修饰。 4.___ to 解析 adapt to意为“适应”。 5._________ to search 解析 inspire sb to do sth意为“激励某人做某事”，为固定搭配。 刷课文改编填空 13 6.__________ difference 解析 设空处作noticed的宾语，其前有不定冠词a修饰，应用名词单数形式。 7.____________ had evolved 解析 此处表示“过去的过去”发生的事情，应用过去完成时。 8._______ Finally 解析 设空处在句中作状语，修饰整个句子，应用副词形式。 9._______ which 解析 设空处引导非限制性定语从句，先行词指物，关系词在从句中作主语，应用which引导该从句。 10.______________ most important 解析 “one of+the+形容词最高级+可数名词复数”意为“最……的……之一”。 刷课文改编填空 14 [安徽县中联盟2024高二联考] 阅读下面短文，在空白处填入1个适当的单词或括号内单词的正确形式。 The Giant Panda National Park, which lies in the western region of China spanning Sichuan, Gansu, and Shaanxi provinces, has been developed 1. . includes 67 existing panda reserves. The giant panda is 2. . symbol of China and one of the most adorable creatures across the globe. This national park 3. . （feature） a population of 1,864 giant pandas, accounting for 80% of the Chinese giant panda population. Apart from the small number of pandas located in zoos around the world, all other giant pandas can 4. . （find） within China. Connecting the 67 existing reserves and 5. . （establish） protected areas allow the pandas to travel between the different regions. This is a focused effort 6. . （help） increase the panda population. The combination of these over 60 panda reserves is a commitment by the Chinese government to protect the species. What makes people 7. . and a features be found establishing to help amazed 刷语法填空 15 （amaze） is that the population is growing. The International Union for Conservation of Nature has downgraded the species 8. . endangered to vulnerable. Although this improvement is 9. . （incredible） positive, there is much the world needs to do to help secure the 10. . （survive） of the species. from incredibly survival 刷语法填空 【语篇导读】本文是一篇说明文。文章主要介绍了大熊猫国家公园的相关信息及其为增加大熊猫数量而作出的努力。 1._____ and 解析 句意为：大熊猫国家公园位于中国西部地区，横跨四川、甘肃和陕西三省，目前已经建成，现有67个大熊猫保护区。分析句子结构可知，本句主语为The Giant Panda National Park,谓语has been developed和includes之间为顺承关系，应用并列连词and连接。故填and。 2.___ a 解析 句意为：大熊猫是中国的象征，是全球最讨人喜欢的动物之一。symbol意为“象征；标志”，是可数名词，此处指“大熊猫是中国的一个象征”，表泛指，且symbol的读音以辅音音素开头，应用不定冠词a修饰。故填a。 刷语法填空 17 3.________ features 解析 句意为：这个国家公园拥有1,864只大熊猫，占中国大熊猫总数的80%。设空处在句中作谓语，此处叙述的是一般性事实，应用一般现在时，主语是This national park，谓语动词应用第三人称单数形式。故填features。 4._________ be found 解析 句意为：除了世界各地动物园中的少量大熊猫外，其他所有大熊猫都在中国境内。设空处位于情态动词can后，应用动词原形；主语为all other giant pandas，与find之间是被动关系，要用被动语态，be found somewhere表示“存在于某地”。故填be found。 刷语法填空 18 5.___________ establishing 解析 句意为：连接这67个现有的保护区并建立保护区可以使大熊猫在这些不同地区间移动。本句谓语动词为allow，and连接两个动名词短语作主语，设空处应用动名词形式。故填establishing。 6.________ to help 解析 句意为：这是一项旨在帮助增加熊猫数量的重点工作。effort意为“尽力；艰难的尝试”，为抽象名词，其后常用不定式作后置定语，an effort to do sth意为“为做某事所作的努力”。故填to help。 刷语法填空 19 【知识拓展】不定式作后置定语 （1）在一些抽象名词attempt、plan、ability、opportunity/chance、effort、right、desire、hope、wish、move、excuse、way等后，常用不定式作后置定语。如：They now have an opportunity to go abroad to study further.他们现在有机会出国深造。 （2）当中心词为序数词、形容词最高级、the last、the only等或中心词被这类词所修饰时，多用不定式作后置定语。如：He was the first guest to arrive.他是第一个到达的客人。 （3）不定式与其所修饰的词之间往往有动宾关系，如果该不定式是不及物动词，其后应有必要的介词。如：Give me some pieces of paper to write on.给我几张纸写字。 刷语法填空 20 7.________ amazed 解析 句意为：让人感到惊奇的是，（大熊猫的）数量还在增长。此处是“make+宾语+宾补”结构，指人们的心理状态，应用形容词amazed作宾补。故填amazed。 8.______ from 解析 句意为：世界自然保护联盟已将该物种从濒危降级到易危。from… to… 为固定搭配，意为“从……到……”。故填from。 9.__________ incredibly 解析 句意为：尽管有了极大的改善，但世界仍需要做很多事情来帮助确保该物种的生存。设空处修饰形容词positive，作状语，应用副词。故填incredibly。 10.________ survival 解析 句意见上一题解析。设空处作动词secure的宾语，根据空前的定冠词the及空后的of the species可知，应用名词，意为“生存”，故填survival。 刷语法填空 21 01 Period Ⅰ Starting out & Understanding ideas Part Ⅱ 拓展阅读训练 22 A [福建厦门一中2024高二期中] “It’s a windy day in Laguna San Ignacio, and the waves seem to come from all directions,” said Sara Clemence in Bloomberg Businessweek.My children and I are riding on an 18-foot boat—small enough that we can reach down into the water if a gray whale swims up alongside. And then we see what we’ve come for: a heart-shaped shower of water and a dark mass rushing below it. As instructed, we splash （往……上泼） the water strongly to signal the huge whale, which turns out to be a mother with her weeks-old baby. The baby soon swims beneath our boat, emerges to blow mist in my face, then “lies onto its side like a 2-ton puppy”.Leaning down, I touch its skin gently.“It feels electric. Also, a bit like petting a hard-boiled egg.” 刷阅读理解 23 San Ignacio is one of the very few places where a person can pet a whale. The whales come each year to the coast of Baja California to give birth and to mate. If you’re lucky, you can “shake hands with a leathery fin （鳍）” or even “plant a kiss on a cold, salty cheek”.I usually worry about such interactions, because wild creatures can become deeply stressed by human contact. But boat numbers are strictly limited in these protected waters. And any whale that approaches a boat does so on its own terms. Like that baby whale: “We see him a few times, and he seems to like being petted and splashed.” So we are two species, connecting through touch, but also through eye contact: “More than once, after nosing around our boat, a young gray whale turns on its side so one dark, baseball-size eye is looking up at us.” Whalers used to call gray whales “devil fish” because these magnificent creatures turn violent when threatened—“or, say, when their babies are harmed.” That makes it feel even more of a blessing when, on our third day there, a large mama whale approaches the boat. “I’m splashing when I feel her nose press up into my hand.” Though she’s “wiser and apparently more alert” than her child, “she still decides to trust us.” 刷阅读理解 24 【语篇导读】本文是一篇记叙文。圣伊格纳西奥湖是少数几个人们可以抚摸鲸鱼的地方之一，文章讲述了作者和孩子在圣伊格纳西奥湖的一段和鲸鱼互动的海上之旅，展现了人与自然界的和谐共处。 1.What can we learn from the text?( ) A A.The writer was on a whale-touching trip. B.The writer’s boat went down with a huge wave. C.The baby whale splashed water all over the writer. D.The mother whale’s skin felt as hard as a boiled egg. 解析 细节理解题。根据第一段中的My children and I are riding on an 18-foot boat—small enough that we can reach down into the water if a gray whale swims up alongside.和第二段中的San Ignacio is one of the very few places where a person can pet a whale.可知，作者和孩子正在圣伊格纳西奥湖进行一次接触鲸鱼的旅行。故选A项。 刷阅读理解 25 2.What do the underlined words in Paragraph 2 refer to about whales in San Ignacio?( ) B A.Mad with too many visitors. B.Ready for hands-on attention. C.Restricted in swimming routes. D.Enclosed in their safety zones. 解析 词义猜测题。根据第二段中的I usually worry about such interactions可知，作者对与鲸鱼互动感到担忧，后文But表转折，在这些受保护的水域，船只的数量是有严格限制的，再根据后文的Like that baby whale: “We… he seems to like being petted and splashed.”可知，这头小鲸鱼似乎喜欢被抚摸和泼水，故此处表示任何一头鲸鱼接近船只都是出于自己的意愿，即“准备好接受这种允许触摸的关注”。故选B项。 刷阅读理解 26 3.What did gray whales get the name of “devil fish” from?( ) D A.Their strange appearance. B.Their inborn violence. C.Their surprisingly enormous size. D.Their fierceness in danger. 解析 细节理解题。根据第三段中的Whalers used to call gray whales “devil fish” because these magnificent creatures turn violent when threatened可知，捕鲸者过去称灰鲸为“魔鬼鱼”，因为这种巨大的生物在受到威胁时会变得暴力。故选D项。 刷阅读理解 27 4.What’s the writer’s implied purpose in writing the passage?( ) D A.To popularise the knowledge of whales. B.To show admiration for whales’ motherhood. C.To share an experience of a sea voyage. D.To advocate harmony between man and nature. 解析 推理判断题。根据第一段中的I touch its skin gently和第二段中的he seems to like being petted and splashed及最后一段中的she still decides to trust us并结合全文内容可知，文章通过描述作者和孩子的一段与鲸鱼互动的海上之旅，想要展现人与自然和谐共处的场景，所以文章隐含的目的是提倡人与自然和谐相处。故选D项。 刷阅读理解 28 B [山东烟台2023高二期中] Honeybees rely heavily on flower patterns not just colours when searching for food, new research shows. A team led by the University of Exeter tested bee behaviour and built bee’s-eye-view simulations （模拟） to work out how they see flowers. Honeybees have low-resolution vision, so they can only see a flower’s pattern clearly when they are within few centimetres. However, the new study shows bees can very effectively distinguish between different flowers by using a combination of colours and patterns. In a series of tests, bees rarely ignored patterns, suggesting colour alone does not lead them to flowers. This may help to explain why some colours that are visible to bees are rarely produced by flowers in nature. 刷阅读理解 29 “We studied a large amount of data on plants and bee behaviour,” said Professor Natalie Hempel, from Exeter’s Centre for Research in Animal Behaviour.“By training and testing bees using man-made patterns of shape and colour, we found they relied flexibly on their ability to see both of these elements. Showing how insects see colour and learn colour patterns is important to understand how pollinators （传粉者） may, or may not, create evolutionary ‘pressure’ on the colours and patterns that flowers have evolved. Our findings suggest that flowers don’t need to evolve too many different flower colours, because they can use patterns to vary their displays so bees can tell them apart from other flowers.” One typical feature identified in the study is that the outside edges of flowers usually contrast strongly with the plant’s leaves while the centre of the flower does not have such a strong contrast with the leaf colour. This could help bees quickly identify colour differences and find their way to flowers. While flowers may be beautiful to humans, Professor Hempel stressed that understanding more about bees and the threats they face meant we need to see the world “through the eyes of a bee and the mind of a bee”. 刷阅读理解 30 【语篇导读】本文是一篇说明文。文章介绍了一项最新的研究发现：蜜蜂在寻找食物时，不单是靠花朵的颜色，而且高度依赖花朵的式样。 1.What does the new research focus on?( ) B A.The source of bees’ food supply. B.The way of bees finding flowers. C.The effect of bees’ poor eyesight. D.The evolution of bees’ behaviour. 解析 细节理解题。根据第二段内容可知，新的研究专注于蜜蜂的行为，并建立了模拟蜜蜂视角的装置，以研究蜜蜂是如何找到花的。故选B项。 刷阅读理解 31 2.What aspect of research into bees did Hempel highlight?( ) A A.Research data. B.Research methods. C.Research objects. D.Research frequency. 解析 细节理解题。根据第五段中亨普尔的话We studied a large amount of data on plants and bee behaviour可知，对于蜜蜂的研究，亨普尔注重研究关于植物和蜜蜂行为的数据。故选A项。 刷阅读理解 32 3.What does Hempel think of flowers trying to evolve more colours?( ) A A.It’s not a must. B.It’s a pressing need. C.It’s beyond belief. D.It’s a temporary solution. 解析 细节理解题。根据第五段中亨普尔的话Our findings suggest that flowers don’t need to evolve too many different flower colours, because they can use patterns to vary their displays so bees can tell them apart from other flowers.可知，亨普尔认为花朵并不需要进化出更多颜色。故选A项。 刷阅读理解 33 4.What’s Paragraph 6 mainly about?( ) D A.An explanation of the research intention. B.Dramatic changes in the research strategy. C.Conflict between different research outcomes. D.Supporting evidence for the research findings. 解析 主旨大意题。根据第五段中的Our findings suggest that flowers don’t need to evolve too many different flower colours, because they can use patterns to vary their displays so bees can tell them apart from other flowers.可知，研究发现蜜蜂通过式样来找到花朵；再根据第六段内容可知，花朵外缘与叶子形成强烈对比，以便蜜蜂识别并找到它们，所以第六段是支持研究结论的证据。故选D项。 刷阅读理解 34 结构分析：本句是一个主从复合句，While引导让步状语从句，主句为主谓宾结构，宾语是that引导的从句，在该从句中，又包含一个主谓宾结构，宾语部分为省略引导词的宾语从句。 句意：虽然花朵对人类来说可能很漂亮，但亨普尔教授强调，多了解蜜蜂以及它们所面临的威胁意味着我们需要“通过蜜蜂的眼睛并以蜜蜂的思维”来看待这个世界。 长难句分析 刷阅读理解 35 核心词汇 1.rely on 依靠；信赖 2.distinguish v.区分；辨别 3.ignore vt.忽视；不予理睬 4.element n.要素；基本部分 5.tell… apart区分；辨别 刷阅读理解 36 [全国乙2023] Indoor plants might look as if they just sit around not doing much, but in many ways they are the unsung heroes of the home.1. ., but studies have shown that they can promote people’s wellbeing by improving their mood（心情）, reducing stress and helping their memory. What’s more, indoor plants are easy to look after and are not very expensive. What are indoor plants? Indoor plants, also known as houseplants or pot plants, are plants that like to grow indoors. Many of these species（物种）are not ideally suited to growing outside in the UK, especially in the winter. 2. .. Why are indoor plants good for you? Will Spoelstra, who works at the Royal Botanic Gardens, says, “3. .. I find during the winter months, plants around the house can really lift your mood.” Several studies have backed this up and found that indoor plants can improve creativity, focus and memory. There is also research showing that pot plants can clean the air around them by removing harmful gases, such as carbon dioxide. They also remove some harmful chemicals from paints or cooking.4. .. B D C E 刷7选5 37 Which plants can you grow? Aloe vera, peace lilies and spider plants are some of the species that are easy to grow indoors. You can buy plants from supermarkets, garden centres or online. Younger plants are often cheaper than fully grown ones, and you get to care for them as they mature—which is part of the joy of owning plants. “5. .,” Spoelstra says. “It can bring a new interest and focus into people’s lives and help to make the link between home and nature.” A.All plants are different B.Not only do they look beautiful C.There are many benefits to growing plants indoors D.Instead they grow better inside, where it is warmer E.Plants like peace lilies and devil’s ivy are among the best F.Changing the pot of your plant from time to time will also help G.Learning about the requirements of each plant can be very rewarding G 刷7选5 38 【语篇导读】研究表明，室内植物可以通过改善情绪、减轻压力和帮助提升记忆力来促进人们的健康。本文主要介绍了种植室内植物的必要性和如何选择有益的室内植物。 1.___ B 解析 根据下文的but studies have shown that they can promote people’s wellbeing by improving their mood, reducing stress and helping their memory以及What’s more, indoor plants are easy to look after and are not very expensive.可知，此处应指出室内植物的优点。结合选项并根据空后的but可知，B项（它们不仅看起来漂亮）衔接上下文，符合语境。故选B项。 刷7选5 39 2.___ D 解析 结合本段小标题可知，本段应介绍室内植物的定义。根据上文的Many of these species are not ideally suited to growing outside in the UK, especially in the winter.可知，许多室内植物不适合在室外生长，此处应承接上文，说明这些植物在室内生长会怎样。D项（相反，它们在温暖的室内生长得更好）符合语境。D项中的they代指前文的Many of these species，且D项中的they grow better inside与前文的not ideally suited to growing outside呼应，where it is warmer与前文的especially in the winter呼应。故选D项。 刷7选5 40 3.___ C 解析 根据本段小标题可知，本段主要介绍室内植物为什么对人有好处。根据下文的plants around the house can really lift your mood和indoor plants can improve creativity, focus and memory以及pot plants can clean the air around them by removing harmful gases可知，本段列举了在室内种植植物的很多具体好处，所以设空处应总起，指出种植室内植物有很多好处。C项（在室内种植植物有很多好处）引出下文列举的在室内种植植物的具体好处，衔接连贯，符合语境。故选C项。 刷7选5 41 4.___ E 解析 上文提到盆栽植物可以通过去除二氧化碳等有害气体来净化周围的空气，它们还能去除绘画颜料或烹饪过程中的一些有害化学物质。设空处位于段尾，应承接上文继续介绍室内植物与空气净化的关系。E项（像白鹤芋和绿萝这样的植物就属于最佳植物）衔接上文，符合语境。故选E项。 刷7选5 42 【易错警示】本题易错选F项，考生会因为上文There is also research showing that pot plants… 中提到pot plants,而将其对应F项中的 the pot of your plant。若不仔细审读上下文，会根据词汇复现而错选F项。本段主要介绍室内植物为什么对人有好处，没有提到如何照顾室内植物，所以F项（不时地更换你的植物的花盆也会有所帮助）不符合本段主旨。 刷7选5 5.___ G 解析 根据本段小标题和下文的“It can bring a new interest and focus into people’s lives and help to make the link between home and nature.”可知，设空处应与植物选择有关，还应提及下文It指代的具体内容。再结合下文的“它可以为人们的生活带来新的兴趣和焦点，并有助于建立家与自然之间的联系”可知，G项（了解每种植物的需求是非常有益的）衔接上下文，符合语境。故选G项。 刷7选5 44 核心词汇 1.mature vi.长成；成熟 adj.成熟的 2.rewarding adj.值得做的；有益的 熟词生义 back 熟义：n.背部 adj.背后的；后面的 生义：vt.支持；帮助 back up支持；证实（某人所言） 构词法 un- prefix 不；未；非；反 unsung adj.被埋没的；未被颂扬的 刷7选5 45 $$