课时作业9 On the Move-【红对勾讲与练·练习手册】2026年高考英语大一轮复习全新方案通用版（外研版）

课时作业9 (总分 I.阅读理解（每小题2.5分，共20分） A (2024·云南昆明质检) Rushing down the path,the traceur(跑酷者)is on the lookout for his next obstacles such as fire escapes,walls or fences.As soon as he realizes a massive brick wall stands between him and where he wants to be,he unintentionally grabs on the wall with his hands and lifts himself to stand on top of it.His next move is a jump that lands him back on solid ground.However,noticing that he is unstable,he rolls to avoid injuries. Traceurs are athletes who perform remarkable gymnastic actions in urban environments.Serious traceurs are fascinated not just by the physical challenges of Parkour,but by its philosophy.Those who learn to excel at Parkour claim to develop not just physical fitness,but self-confidence and critical thinking skills,as they train themselves to find ways around every obstacle in their paths. Because of these philosophical foundations, Parkour is often described by traceurs as more of a lifestyle or an art form than a sport.Passionate traceurs are determined to keep Parkour from becoming a competitive attempt.Competition,they argue,devalues the philosophical theory behind Parkour.People who practice Parkour should be more concerned with their relationship to the environment than with a ticking clock,a score or a cheering crowd.Furthermore, traceurs should work with each other to improve confidence,awareness and unity.Competition,they argue,only brings about feelings of conflict and disharmony. While Parkour purists suggest that the philosophy behind Parkour helps to limit injuries,they must remember that not everyone who tries to leap over a mailbox is an experienced traceur trying to get in touch with his or her environment.Adolescents attempting to carry out these acrobatic(杂技的)skills could severely injure themselves.So while newcomers to Parkour might be eager to investigate this art of movement,it would be wise for them to remember the (横线下方不可作答) 班级： 姓名： On the move :35分) physicality behind the philosophy.After all,philosophy is not much good to a broken leg. 1.Why does the author describe a traceur at the beginning? () A.To illustrate what Parkour is like. B.To teach ways of avoiding injuries. C.To explain different Parkour moves. D.To highlight the popularity of sports. 2.How can Parkour enhance a traceur's self-confidence? A.By strengthening physical fitness. B.By winning Parkour competitions. C.By building faith in conquering barriers. D.By grasping some philosophical theories. 3.What do we know about serious and pure traceurs? () A.They are aware of how to treat injuries. B.They suggest individual efforts in the sport. C.They stress the relationship to the environment. D.They are more concerned with remarkable actions. 4.What does the author advise newcomers to do? A.Face physical challenges boldly. B.Learn from experienced traceurs. C.Start from leaping over a mailbox. D.Consider the risk of severe harm. B (2025·八省联考卷) Want to learn a new language or get A's in college exams?Previous studies have shown that exercise can help stimulate the areas of the brain that convert new information into long-term memory.A new study has taken this information one step further and found the best time when exercise can help maximize learning. Building upon past research that found exercise releases biochemicals that improve mental function, scientists at Radboud University and the University of Edinburgh conducted a study to determine when exercise was most beneficial to learning. Participants-72 healthy male and female adults- were first asked to perform a computer test that 65 必修第二册 challenged their visual and spatial learning.After the test,all of the subjects watched nature documentaries, but two-thirds of them also exercised.Half of the exercisers did circuit training on an exercise bike for 35 minutes immediately after the test.The other half did the same exercise but not until four hours after they had been tested. Two days later,all of the participants returned to the lab for a recall test,and they were connected to MRI(磁共振成像)machines to assess their brain activity.The participants who exercised four hours after taking the computer test were able to recall what they had learned most accurately.Their brainwaves also showed more consistent levels of activity,indicating that their brains were less taxed to remember what they had learned. According to this research,the best time to exercise to improve learning is four hours after studying.But why?That's one question the researchers have yet to answer.Another question left unanswered is the level of exercise that might best improve learning. I've run enough marathons to prove the fact that my brain is anything but sharp during or after a tough workout.But the researchers noted that light workouts might not give the brain enough of a biochemical boost to improve learning. 5.What did the new study aim to explore? A.When exercise is best for learning. B.What biochemicals are good for health. C.How brainwaves should be measured. D.Which area of the brain is the most active. 6.What were all the participants asked to do during the experiment? A.Train on bicycles. B.Do mathematics exercises. C.Play computer games. D.Watch films about nature. 7.Why did the participants return to the lab two days later? A.To do a medical examination. B.To have their memory tested. C.To get their workouts recorded. D.To finish their previous tasks. 8.What might the author's marathon running prove? A.The findings of the study are reliable. B.Long-distance runners are often smart. 红对勾·讲与练4 C.Studies on the marathon are not enough. D.Hard exercise may not sharpen the brain. Ⅱ.语法填空（每小题1.5分，共15分）得分 (2024·山东济南模拟) Every year on March 14,students around the world put down their textbooks and pick up slices of pie to celebrate a unique and delicious holiday-Pi(T) Day. Thinking of the first3 digits(数位)ofpi(3.14), you can quickly work out 1 March 14 was chosen as the date for Pi Day.In 2019,UNESCO set the day as the International Day of Mathematics to celebrate the beauty of math and stress the essential role it plays in all aspects of our lives. Pi Day was first celebrated in the US in 1988 at San Francisco's Exploratorium,a museum of science and technology which 2(encourage visitors to be hands-on.During the first celebration, Exploratorium's employees marched around one of the circular 3 (space)of the museum because pi is the rate of a circle's circumference (to its diameter. As a celebration of the mathematical constant pi, Pi Day in China is to honor Zu Chongzhi (429-500 CE),a Chinese mathematician who calculated pi as being 4 3.1415926 and 3.1415927,a record in accuracy 5 was not surpassed for over 800 years. Pi Day is celebrated in 6 variety ways across the world.In the US,schools usually hold activities related to pie,such as pie-eating contests or 7 simple)throwing pie toward each other. "In Germany,the celebration of Pi Day takes on a cultural twist,"said a 15-year-old German girl. Schools inspire students 8 express their artistic side through pi-related art displays.These range from pi-inspired paintings to mathematical sculptures, training creativity within the field of mathematics.She even built a 3-dimensional cityscape with Lego for Pi Day,9(use)different colored blocks to represent each digit of pi. So,this year's Pi Day was no different.Pies 10 eat)up and numbers rolled as students across the globe came together yet again to honor the charm of pi and math as a whole. 66 高三英语WYcarried in the groceries;he took note of un- locked doors,offered gardening advice,and taught more than a few young boys the art of curveball..”可知，Jim不仅送信，还帮助居民 做很多事情，记住每个孩子和宠物的名字， 帮忙送杂货，关注居民安全，教孩子们打球， 这些行为都体现了他热心善良的性格特征， 故选C。 2.B词义猜测题。文章第二段提到“Though the postal service is often disparaged now,the trust in local postal service lives on. ,根据 Though可知，上下文形成转折关系，表示虽 然邮政服务现在经常受到负面评价，但人们 对当地邮局服务的信任依然存在。因此 “disparaged”的意思与criticized最接近，故 选B。 3.D推理判断题。根据文章第三段的“Atev ery stop,Jim accepted the parting good wishes of families that had become his own.There were tears and laughter,and hugs filled with warm memories..”可知，在最后的工作日，Jim 在每个停靠点都接受了居民们的道别祝福， 故选D。 4.A写作目的题。通读全文，特别是根据最 后一段的“It's been33 years since Jim left the route,but we are still reminded of the deep bond established between community and letter carrier..”可知，作者的写作目的是要纪念这 位受人尊敬的邮递员Jim,展现他与社区之 间建立的深厚情谊，故选A。 B [语篇解读]本文是一篇说明文。新研究 表明，为了解决偷猎问题而切掉黑犀牛的角会 影响黑犀牛的领地面积和它们之间的社交」 而对于这种措施是否有利于动物保护，产生了 不同的看法 5.B细节理解题。根据第一段内容可知，切 除黑犀牛的角是为了降低它们对非法猎人 的吸引力，保护它们不被非法猎杀。 6.A词句猜测题。根据画线短语前的this可 知，这里提到的invasive procedure指代作者 上文中刚提到的事物，结合上一段中的 "Indeed,a University of Bristol study pub- lished last year showed that dehorning does not negatively affect populations overal.”可知，这 里invasive procedure指的是去掉黑犀牛的角。 7.D推理判断题。根据最后一段中的“‘It's incredibly complicated,'says Lucy Chimes... their nearness to national borders and whether there is community engagement..'”可知，Lucy Chimes没有正面回应切除黑犀牛的角这个 问题，而是说偷猎减少这个现象很复杂，除 了切除黑犀牛角这个因素外，需要考虑到许 多因素，由此可推测，她对切除黑犀牛角的 态度是不确定的。 8.B推理判断题。根据最后一段中的“There are so many other factors involved...their nearness to national borders and whether there is community engagement..”可知，在谈到偷 猎减少这个问题时，除了切除黑犀牛角这个 因素外，需要考虑到围栏、巡逻、工作人员数 量以及公园周围的贫困程度、公园与国家边 界的接近度以及是否有社区参与等许多因 素，由此可推测出，多种不同的因素导致非 法偷猎减少。 Ⅱ.完形填空 1.C2.A3.B4.C5.A6.C7.A 8.A9.B10.C11.A12.B13.C 14.A15.B 课时作业7 Food for thought I.阅读理解 [语篇解读]本文是一篇说明文。文章主 要介绍了像鳗鱼和沙丁鱼这样的罐头鱼被称 为最健康的零食之一，它们富含omega-3脂肪 酸、蛋白质、钙和维生素A。 1.D推理判断题。第一段提到像鲲鱼和沙丁 焦虑的风险。D项“超加工食品对心理健康 鱼这样的罐头鱼营养丰富，是最健康的零食 的负面影响”点明了文章主旨，适合作标题 它们富含omega-3脂肪酸、蛋白质 故选D 钙和维生素A。下文提到了沙丁鱼对几乎 Ⅱ.阅读七选五 所有人都有吸引力和小鱼可以为很多食物 1.G2.A3.E4.D5.F 增味。由此可知，第一段提出问题（还有多 少其他的超级食物能做成漂亮到可以送人 课时作业8Let's celebrate! 的罐头食品呢？)主要是为了强调作者对罐 I.阅读理解 头鱼的喜爱。故选D项。 A 2.A推理判断题。根据第二段内容可知，作 [语篇解读]本文是一篇记叙文。文章主 者通过列举一些事例来说明人们对沙丁鱼 要介绍了在海拔4300米的秘鲁安第斯山脉举 的喜爱。故选A项。 行庆祝活动的节日一Qoyllur Riti。 3.C词义猜测题。画线词下文提到厨师兼 1.C细节理解题。根据第二段“As I looked 《头鱼的魔力》一书的作者Chris McDade back down the trail we had climbed,and up 说，在酱汁中加入少量鲲鱼会带来“味道的 towards where we had to go,the colorful sight 进发”，他把鲲鱼称为“厨师的秘密” ,此外 struck me a lot.”可知，作者一家在爬山的过 头鱼搭配沙拉和新鲜蔬莱也非常美味。 程中被路上美丽的景色打动了 由此可知，添加小鱼可以使食物变得美味。 2.C词义猜测题。根据画线词上文“It was 画线词应意为“可口的，美味的”，mouth clear.weaken the festival spirit..”可知，作者 watering“非常可口的”与之意思相近。故选 在很远的地方都能够听到从营地传出来的 而 鼓声和歌声，说明营地里的节日气氛可以非 4.B推理判断题。根据最后一段内容可知」 常明显地感受到，在很远的地方都很清晰。 McDade认为小鱼处于食物链的较低层。每 故画线词与C项意思接近。 个人都喜欢大鱼但我们也必须吃小鱼。这 3.B推理判断题。根据第二段“Many of them 是保持平衡的唯一方法。此外，头鱼富含 had horses..this remarkable event.”可知，很 营养且含有极少的汞，吃罐头鱼是保持体内 多人为了参加这个活动甚至走了很长时间 营养平衡的好方法。由此可知，吃小鱼是有 的路，说明他们是下定决心要来参加这个活 益的选择。故选B项。 动的 4.D推理判断题。根据第一段“I was on an [语篇解读]本文是一篇说明文。超加工 amazing..the southern Andes of Peru."和下 食品的消费在过去20年中有所增加。人们已 文中作者对于该节日的描写可知，本文讲述 知，较高的超加工食品摄入量与超重和心脏病 的是世界上不同的文化特色。由此推断，本 有关，而一项新研究发现，超加工食品对心理 文可能出自文化杂志。 健康也有负面影响，它可能会增加痴呆、抑郁 和焦虑的风险。 [语篇解读]本文是一篇说明文。文章主 5.B细节理解题。根据第一段中的“UP℉s 要介绍了世界大笑日 contain few or no whole foods,are industrially5.A推理判断题。根据第一段以及下文可 produced,are ready-to-eat or ready-to-heat. 知，文章第一段确立中心话题 一笑，从而 and include additives.The ultra-processing of 引出下文，介绍世界大笑日。 food lessens its nutritional value.”可知，超加 6.C细节理解题。根据第二段中的“World 工食品含有很少或不含天然食物，是工业生 Laughter Day is an annual...benefits of laugh- 产的，是可即食或加热即食的，而且含有添 ter.”以及第三段中的“World Laughter Day is 加剂。食品的超加工降低了其营养价值 celebrated..friendship through laughter..”可 由此可知，超加工食品是预先制成的速食食 知，庆祝世界大笑日是为了促进笑声对健康 品。故选B 的益处和世界和平 6.A 观点态度题。根据题干中的“Eic7.B词义猜测题。根据第三段中的“Accord- Hecht”可将解题信息定位至第三段。根据 ing to this hypothesis,a person's facial 该段中Eric Hecht的话“this study has great expressions can have a direct effect on their significance in clinical practice and public emotions.”可知，面部反馈假说是指面部表 health.It might help improve future develop- 情可以影响情绪的观点。 ment of dietary guidelines”可知，Eric Hecht 8.C段落大意题。根据第五段内容可知，本 认为这项研究在临床实践和公共卫生方面 段主要讲在世界大笑日举行的各种活动。 有重大意义，它可能有助于改善未来饮食指Ⅱ.完形填空 南的发展。由此可推断，Eric Hecht对这项1.D2.B3.A4.C5.B6.C7.D 研究持肯定的态度。故选A。 8.A9.A10.C11.B12.A13.C 7.B 推理判断题。根据最后一段中的14.D15.D "Researchers recommend taxes on UPFs and carrying out policies to reduce the consump- 课时作业9 On the move ion.”可知，研究人员建议对超加工食品征 【.阅读理解 税，并实施减少超加工食品消费的政策。由 此可推断，研究人员建议人们要降低膳食中 [语篇解读]本文是一篇说明文。文章主 超加工食品的比例，减少超加工食品的摄入 要介绍了社会上出现的一种体育爱好者 量。故选B。B项中的share在此作名词，意 跑酷者，并阐述了跑酷者哲学，同时针对跑酷 为“ 一份，份额”。 新手提出了一些建议。 8.D标题归纳题。综观全文，尤其是第一段 1.A推理判断题。本文第一段非常形象地塑 中的“Now,research has been extended to 造了跑酷者进行跑酷的形象，由此可知，作 examine its impact on mental health”,第二段 者开头谈到跑酷者是告诉读者跑酷到底是 中的“every 10 percent increase in daily intake 什么样的。故选A。 of UPFs was associated with a25 percent2.C细节理解题。根据第二段最后一句话 higher risk of dementia”和第三段中的“indi- "...self-confidence and critical thinking skills, viduals who consumed the most UPFs had sta- as they train themselves to find ways around tistically significant increases in the symptoms every obstacle in their paths”可知，那些学会 (症状)of mild depression,‘mentally un- 跑酷的人声称，在他们训练自己找到绕过道 healthy days',and‘anxious days'”可知，本 路上每一个障碍的方法时，不仅可以锻炼身 文主要介绍的是超加工食品对心理健康的 体素质，还可以增强自信心和批判性思维能 负面影响，它可能会增加人们痴呆、抑郁和： 力。故进C -577- 参考答案2。 3.C推理判断题。根据第三段中的“People B who practice Parkour should be more con [语篇解读]本文是一篇说明文。文章主 cerned with their relationship to the environ- 要介绍了土耳其皮影戏的起源、衰落以及人偶 ment than with a ticking clock,a score or a:师Ozek为了保留皮影戏所做的努力。 cheering crowd”和第四段中的“they must5.A细节理解题。根据第一段中的“He holds remember that not everyone who tries to leap a piece of camel leather...In front of him are a over a mailbox is an experienced traceur trying few bottles of paints that he will use to create to get in touch with his or her environment'”可 jointed puppets(皮影人偶).”可知，Ozek正 知，他们都谈到了跑酷与环境之间的关系。 在做皮影人偶。敌选A。 故选C。 6.C推理判断题。根据第一段中的“The the- 4.D细节理解题。根据最后一段中的“Ado ater is one of the last in operation in the city." lescents attempting..a broken leg.”可知，虽 然跑酷新手可能渴望研究这种运动艺术，但 和第二段中的“but only five or six of them 对他们来说，要注意考虑严重伤害的风险。 are real professionals'”可知，土耳其皮影剧院 只有一个在运营，且从事皮影戏的人中只有 故进D。 五六个人是真正的专业人士，由此可推出它 B [语篇解读]本文是一篇说明文。文章介 正在衰落。故选C 绍了一项关于运动助力学习的新研究 7.B推理判断题。根据第三段内容可知，本 5.A细节理解题。根据文章第一段的“A 段主要强调了土耳其木偶戏的起源。故 new study has taken this information one step 选B further and found the best time when exercise 8.D推理判断题。根据最后一段第一句 can help maximize learning..”可知，新研究是 "Ozek wants to open a Karagoz museum in 为了探索什么时候运动对学习最有益。故 his city in order to keep this art alive.”可知， 选A。 Ozek想要开-个Karagoz博物馆是为了保 6.D细节理解题。根据文章第三段的“After 持皮影艺术的活力，希望皮影剧院能保留下 the test,all of the subjects watched nature doc- 来。故进D umentaries'”可知，在实验中所有参与者都被Ⅱ.完形填空 要求观看自然纪录片。故选D。 1.D2.B3.C4.D5.A6.A7.D 7.B细节理解题。根据文章第四段的“Two8.C9.A10.B11.A12.B13.D days later,all of the participants returned to 14.C 15.B the lab for a recall test'”可知，参与者两天后 课时作业11 On the road 回到实验室是为了进行记忆测试。故选B。 8.D推理判断题。根据文章最后一段的 I.阅读理解 "I've run enough marathons to prove the fact..a tough workout.”可知，作者想用自己 [语篇解读]本文是一篇说明文。文章列 的马拉松经历说明剧烈运动可能不会使大 举了在全球物价普遍上涨的背景下，生活成本 脑更敏锐。故选D。 相对较低，却拥有完善便利设施的三个大城 Ⅱ.语法填空 市：葡萄牙的里斯本、加拿大的多伦多和日本 1.why 2.encourages 3.spaces 4.between 的东京，并为有意前往的旅行者提供了实用的 5.that/which 6.various 7.simply 旅行推荐。 8.to express 9.using 10.were eaten 1.C细节理解题。根据第二段的最后一句 课时作业10 Stage and screen "The Roman Theatre Museum gives a glimpse into the city's Roman past,with preserved the I.阅读理解 atre ruins.”可知，通过游览the Roman Thea- [语篇解读]本文一篇记叙文。文章主要 tre Museum,游客可以对这座城市的历史有 讲述了作者有一天晚上路过小提琴店向内张 所了解。 望的时候，思绪回到了儿时。作者小时候被父 2.A细节理解题。根据第二段的第二句 母要求着练习游泳，尽管她自己并不喜欢。后 "Mercedes Zach recommends exploring the 来，校管弦乐队的展演让作者对小提琴开始入 bohemian(波西米亚式的)Bairro Alto neigh- 迷，在征得乐队指挥和父母同意后，作者开始 bourhood to uncover street art,city views and 了自已的小提琴学艺之旅」 sunset gatherings with locals.”以及第四段第 1.D细节理解题。根据第三段末尾的“As 二句中的“public art displays at the newly de- my eyes rested on them,I felt as though I were veloped Azabudai Hills neighbourhood for looking through a window into my own past. free”和第三句中的“which offers a view of 和第四段开头的“My childhood was all about the city from 250 m above sea level for just the pursuits I had attempted”可知，在小商店 2,000yen”可知，游客在里斯本和东京两座 看到小提琴后，Tara的思绪回到了儿时。由 城市都可以既欣赏城市景观，又可以感受艺 此可见，看到小提琴让Tara想起了儿时记 术魅力。 忆。故选D。 :3.A主旨大意题。本文旨在列举目前在全球 2.C细节理解题。根据第六段中的“But the 范围内生活成本相对较低，同时拥有完善便 violin...ah,the violin.It made the sweetest 利设施的三个大城市供旅行者参考，并为旅 sound I'd ever heard!My heart was dancing 行者提供了实用的旅行推荐。 along with its flowing tune.”可知，小提琴发 出的声音吸引了Tara。故选C [语篇解读]本文是一篇夹叙夹议文。文 3.D细节理解题。根据最后一段“I began 章主要记叙了五月的一天，作者受朋友的邀 practicing..in the community orchestra..”可 请，和一些陌生人去冲浪，尽管大家相互不熟 知，Tara满怀热情地坚持练习，她的能力快悉，但是在旅行中大家合作愉快、共同进步，这 速提升，并在不久后赢得了社区管弦乐队的让作者不禁感慨，不走出舒造区，你永远不知 首席位置。故选D。 道自己能做什么。 4.B推理判断题。根据文章内容可知，Tara 4.D细节理解题。根据第一段中的“10 对游泳不感兴趣，她拼命地练习游泳，表现 women aged 30 to 45,all complete strangers, 却并不好。而小提琴是Tara的兴趣所在，因 were to meet on the coast of Portugal to try 此，她愿意坚持练习并取得了很不错的成 something new”可知，激发作者去参加冲浪 绩。由此可见，兴趣激发热情，创造奇迹。 旅行的动机是她想要去尝试一些新鲜的事 故选B 物，故远D项。 2对勾·讲与练·高三英语WY -578- 5.B细节理解题。根据第二段中的“as it al- lows you to become really good at one particu- lar thing,but it also kind of ends up leaving some skills lacking”可知，成年人专注于掌握 一个领域能让你变得真正擅长一件特定的 事情，但它最终也会让你留下一些技能的缺 失。由此可知，成年人专注于掌握一个领域 会缩小一个人的潜力，故选B项。 6.C推理判断题。根据第四段的内容和第五 段中的“Sometimes,it poured with rain,and the waves crashed around us...every slip and fl1”可知，这次旅行富有挑战性；根据第五段 中的“a new level of genuine joy and personal achievement had been unlocked”和最后一段 中的“Learning a new skill taught me the hu- mility(谦虚)..and the pride that develops when you finally manage to grasp something you've been working on...trying it out inspired me to take more risks in life”可以看出，这次 旅行让作者很有收获，即很值得。故选 C项。 7.D推理判断题。根据最后一段中的“trying it out inspired me to take more risks in life. You never know what you're capable of if you don't go out there and try”可知，尝试冲浪激 发了作者在生活中承担更多的风险。如果 你不去尝试，你永远不知道你能做什么。由 此可以推断，作者更愿意尝试新的生活体 验。故选D项。 Ⅱ.阅读七选五 1.E2.D3.A4.B5.G 课时作业12 Earth first I.阅读理解 4 [语篇解读]本文是一篇说明文。文章主 要介绍了废旧电子产品的潜在经济价值与环 保意义 1.A推理判断题。根据第一段内容可知，人 们可能没有意识到，他们抽屉里不想要的电 子产品可能价值数千英镑，这些被忽视的物 品可能是额外假日现金、一次梦想的暑假 一个周末特别款待的来源。这表明人们常 常忽视废旧物品所具有的潜在财富。故选A 项。 2.B推理判断题。根据第三段中的“they contain some of the most precious materials on the planet,like gold,aluminium and lithium" 可知，废弃电子产品含有一些地球上最珍贵 的材料，如金、铝和锂。这表明可以从电子 垃圾中提取这些珍贵材料。故选B项。 3.D段落大意题。文章最后一段主要讲述了 从使用过的电子产品中获利的步骤，包括盘 点、研究市场价值、清理、确保产品正常运 转、提供详细描述和照片、选择销售平台、确 保数据安全和交易安全。故选D项。 4.D写作目的题。作者在文章中详细讲述了 出售废旧电子产品的潜在收益和环保意义， 鼓励人们回收利用这些物品，旨在倡导一种 既经济又环保的回收方式。故选D项。 [语篇解读]本文是一篇说明文。文章主 要讲述了在未来，海洋吸收二氧化碳能力的下 降会导致全球变暖。 5.C推理判断题。根据题目中的2300可以 定位到第一段中的“researchers found that the oceans'capacity...decrease to half of its current efficiency by2300”可知，到2300年，海洋吸 收二氧化碳的效率将降低一半，再由上文中 的“The oceans play a crucial role in lightening global warming by absorbing carbon dioxide (CO,)emissions. ”可知，海洋通过吸收二氧 化碳在减缓全球变暖方面起着至关重要的 作用。由此可知，一旦海洋吸收二氧化碳的 效率降低，全球变暖问题将更严重。故选C。