托福综合写作范文真题解析

新托福TPO综合写作详细解析汇总
在新托福综合写作中，有的同学语言使用的能力还有一定局限，还要刻意追求句式的复杂化，但这样的后果就是写出来的句子个个都有错，个个都有表达不清。

其实用最好的词表达最多的内容才是最厉害的写作方式，本文小编为大家整理了一篇新托福综合写作范文，来源于TPO 1—15。

新托福综合写作范文TPO2详细解析:团队的作用
新托福综合写作范文TPO3详细解析:伦勃朗
新托福综合写作范文TPO4详细解析:恒温动物
新托福综合写作范文TPO5详细解析:查科峡谷的巨屋
新托福综合写作范文TPO6详细解析:在线百科的利弊
新托福综合写作范文TPO7详细解析:环保认证在美国无用
新托福综合写作范文TPO8详细解析:塞恩加尔骑士
新托福综合写作范文TPO9详细解析:氢燃料
新托福综合写作范文TPO10详细解析:海獭数量减少的原因
新托福综合写作范文TPO11详细解析:人们不爱读书了
新托福综合写作范文TPO12详细解析:简·奥斯汀
新托福综合写作范文TPO13详细解析:私人化石买卖的坏处
新托福综合写作范文TPO14详细解析:回收性砍伐
新托福综合写作范文TPO15详细解析:控制蔗蜍数量的方法
新托福综合写作对语言的要求是清晰表达，准确转述即可(其实独立写作的要求也类似)。

没有必要一味地追求语言的华丽，把话说清楚最重要。

瑞德托福模考系统是专业的托福模拟考试软件、托福在线模拟考试软件，提供在线托福全真模考，系统可创建真实托福模考(TOEFL iBT)环境，按照阅读、听力、口语、写作四部分进行考试。

详情了解请登陆托福模考软件
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托福TPO52综合写作题目及范文（附解析）托福TPO52综合写作题目及范文(附解析)TPO52综合写作的阅读要点内容为蔗糖可能带来许多健康风险，当作为糖的替代品。

今天给大家带来写作思路解析及范文，希望对大家有帮助。

托福TPO52综合写作题目听力文本：M: Now listen to part of a lecture on the topic you just read about:M: Many studies have found sucralose to be perfectly safe for people to consume. And it is useful for people who are trying to lose weight. The reading’s arguments against using sucralose can all be challenged.First, about sucralose affecting the thymus. If you look closely at the studies of sucralose consumption, there were no effects on the rats at all until they were eating extremely large quantities of sucralose. In order for a human to eat the equivalent amounts that affected the rats being studied, a human would have to consume about 4000 packets of sucralose per day for a month.Second, sure, some organochlorines are toxic. If they are consumed, they are digested and stored in fat tissue, and they continue to build up in the fat tissues till they reach toxic levels. But studies show sucralose is a bit different from the other organochlorines. Sucralose is not absorbed by the digestive system very well and so it does not accumulate in the body’s fat tissue. Since sucralose is not absorbed well by the digestive system and doesn’t build up to dangerous leve ls in fat tissue, it is unlikely to have the toxic effect that the otherorganochlorines do.Finally, there is the argument that many people who use artificial sweeteners in their drinks end up eating lots of real sugar in food like cake, and so they negate the benefits of using the sweetener. Well, that argument may hold true for many artificial sweeteners but sucralose has a unique property that makes it different. Most artificial sweeteners breakdown if they are heated too much, but sucralose does not break down when heated. That means that unlike other sweeteners, sucralose can be used to bake things, like cakes and cookies, for example. People craving something sweet can turn to cakes or cookies baked with sucralose, which helps them keep their diets on track.M: Summarize the points made in the lecture, being sure to explain how they challenge the specific points made in the reading passage.阅读文本：ReadingSucralose is an artificial sweetener that is used in place of natural sugar. Many people use sucralose as a substitute for sugar to control their weight. However, there may be several health risks associated with sucralose. Also, it is not clear whether sucralose actually helps people lose weight.First, researchers in Australia did studies on rats and discovered that sucralose consumption caused shrinking of the thymus in rats. The thymus is an organ that is crucial to maintaining a healthy immune system; in humans it is particularly active in childhood. If sucralose has similar effects on humans, then long-term use of sucralose could cause harm to the immune system, especially in children.Second, sucralose is created by replacing some of the atoms in natural sugar molecules with chlorine. This means sucralose belongs to a group of chemicals called organochlorines, which is another cause for concern. Organochlorines are known to be toxic to plants and animals, including humans. Some organochlorines are even used as pesticides. Sucralose is chemically similar to these toxic chemicals, so there may be a risk of poisoning if sucralose builds up in human body tissue (in fat tissue, for example).Third, substituting artificial sweeteners for real sugar in coffee, tea, and soft drinks often does not help people lose weight, since it reinforces the habit of enjoying sweet food. When people use artificial sweeteners in their drinks, their appetite for sugar remains strong, and they satisfy their sweetness cravings by eating greater portions of foods containing real sugar, such as cakes or cookies. Such eating habits can prevent them from achieving their goal of losing weight.Summarize the points made in the lecture, being sure to explain how theysupport/contradict specific points made in the reading passage.答题思路：1. 阅读要点概括：Main point: Sucralose may bring about many health risks when used as a substitute for sugar.Sub point 1: Sucralose may cause harm to the immune system.Sub point 2: There may be a risk of poisoning if sucralose builds up in human body tissue.Sub point 3: Substituting artificial sweeteners for real sugar does not help people lose weight.2. 听力要点概括：Main point: Sucralose is perfectly safe for people to consume.Sub point 1: It requires a consumption of extremely large quantities of sucralose to affect the thymus.Sub point 2: Sucralose does not accumulate in the body’s fat tissue so that it is unlikely to have the toxic effect.Sub point 3: People can use sucralose to replace sweet while keep their diets on track.范文：The sp eaker rebuts the reading’s arguments by debunking the exaggerated tested side effect on the human body, the hasty generalization that sucralose is proven toxic, and unwarranted claims that Sucralose can increase one’s sugar intake.The speaker begins by stating that Sucralose does affect the thymus, but only when the individual consumes a very large quantity of it, over 4000 packets per day. Despite the claim from the reading that sucralose might exert similar detrimental effects on a human thymus given the conclusive side effect has been witnessed in rats, the professor argues Sucralose can only pose a threat to one’s health under mass usage.Contrary to the belief in the passage that it belongs to a group of toxic chemicals called Organochlorines, Sucralose has been shown to act differently than traditional Organochlorines. The professor argues that people have a hard time fully digesting it and it does not build up in the body, therefore it is much less toxic. This directly challenges the fundamental theory in reading.Lastly, the professor casts doubt on the validity of the assumption that sucralose can encourage binge intakes of sweet food. The reading reasons that sucralose can build a growing reliance on sweetness, thus further d amaging one’s health.However, the speaker maintains that the very nature of Sucralose can endure a high heating temperature, thus serving as a perfect candidate to replace artificial sweeteners. In that sense any unfair concern over Sucralose being a gateway sugar inducer would be groundless.。

托福TPO1综合写作真题、音频及解析Reading Part:In the United States, employees typically work five days a week for eight hours each day.However, many employees want to work a four-day week and are willing to accept less pay in order to do so. A mandatory policy requiring companies to offer their employees the option of working a four-day workweek for four-fifths (80 percent) of their normal pay would benefit the economy as a whole as well as the individual companies and the employees who decided to take the option. The shortened workweek would increase company profits because employees would feel more rested and alert, and as a result, they would make fewer costly errors in their work. Hiring more staff to ensure that the same amount of work would be accomplished would not result in additional payroll costs because four-day employees would only be paid 80 percent of the normal rate. In the end, companies would have fewer overworked and error-prone employees for the same money, which would increase company profits. For the country as a whole, one of the primary benefits of offering this option to employees is that it would reduce unemployment rates.If many full-time employees started working fewer hours, some of their workload would have to be shifted to others. Thus, for every four employees who went on an 80 percent week, a new employee could be hired at the 80 percent rate. Finally, the option of a four-day workweek would be better for individual employees. Employees who could afford a lower salary in exchange for more free time could improve the quality of their lives by spending the extra time with their families, pursuing private interests, or enjoying leisure activities.中文解析：在美国，职员一般执行的一周五天，每天八小时工作制。

托福写作高分120 中的综合写作题目Marco PoloThe reading passage says that Marco Polo, a V enetian trader and explorer, had traveled to China. The lecturer states her positive opinions in three ways against the naysayers:Firstly, according to the lecturer, the fact that Marco Polo did not mention any Chinese or Mongolian place-names in his books does not necessarily mean that he did not travel to China at all. It was impossible that Marco had borrowed place-names from Persian, which was a common trade language during his period.Secondly, Marco spent most of his time in northern China while the love for tea was only common in southern China 或in the south of China during his period. So it was understandable that Marco did not mention such cultural practice in his books.Finally, there are other explanations, besides that Marco was never appointed in the Chinese court; also we could not find original records in the materials of Chinese or Mongols. It was possible that Marco was referred to different names in those records, which was common in ancient Chinese records. Or the records could be simply missing.In conclusion, the lecturer states his disagreement with the opinion that Marco Polo had never traveled to China.参考分数：24分文章的框架清晰，结构合理，能够抓住材料的主要观点并对其加以阐述，但语句的表达还是有点生疏，不够娴熟。

2024托福写作范文赏析整合在2024年的托福考试中，写作部分还是会是同样的难点。

为了让各位考生更好地备考，我们整合了以下几篇经典的范文，供大家参考学习。

1. 题目：Do you agree or disagree with the statement that self-driving cars will become the primary means of transportation in the future?范文：With the rapid development of technology, self-driving cars have become a well-talked topic around the world. Some people believe that self-driving cars will become the primary means of transportation in the future because of the advantages they bring. However, other people hold a different view. From my perspective, although self-driving cars have many advantages, they are unlikely to become the primary means of transportation in the future.First and foremost, self-driving cars still have some problems that need to be solved. For example, they cannot cope with extreme weather conditions or complex roadsituations. It is hard to imagine a self-driving car maneuvering through a flooded road or a narrow alley with alot of pedestrians and cyclists. Additionally, self-driving cars cannot replace all the functions of traditional cars.For some situations, such as off-road trips or extreme sports, traditional cars with manual control will still be theprimary choice.Moreover, the cost of self-driving cars is still high. At present, only a few people can afford to own a self-driving car, and the price of it will remain high for a long time. Therefore, self-driving cars will not become the primary means of transportation for most people, especially in developing countries.Last but not least, there are still many people who enjoy driving their cars. Driving on your own gives you a sense of control and freedom, and it is a joy that cannot be replacedby a machine. Even if self-driving cars become more prevalent in the future, there will always be people who prefer driving their own cars.In conclusion, self-driving cars have many advantages,but they are unlikely to become the primary means oftransportation in the future. They still have some problems that need to be solved, such as their inability to cope with extreme weather or complex road situations, and their high cost. Moreover, there are still many people who enjoy driving their cars. Therefore, we should not overestimate the importance of self-driving cars.2. 题目：Do you agree or disagree with the statement that advertisements are manipulative and should be banned?范文：Advertisements are an indispensable part of our daily lives. However, there is a growing concern that advertisements are manipulative and should be banned. From my perspective, I partially agree with the statement that advertisements are manipulative. However, I do not think that they should be banned completely.Firstly, advertisements are manipulative by nature. Advertisers use different techniques to present their products in the most appealing way, and they often exaggerate the benefits of their products while minimizing their drawbacks. This is understandable, as the goal ofadvertisements is to attract consumers and boost sales. However, this can also lead to unrealistic expectations and disappointment when the product does not live up to the advertisement.On the other hand, advertisements can also be informative and educational. Advertisements can provide valuable information about new products, services, or events. They can also raise awareness of social issues or health problems. For example, some public service announcements can be very effective in promoting safe driving, healthy lifestyle or environmental protection.Moreover, advertisements can also provide entertainment. Many commercials use humor, music, or other creative elements to capture our attention and evoke our emotion. They can be an enjoyable part of our daily lives and can even become a cultural phenomenon.In conclusion, advertisements are manipulative by nature, but they are not necessarily bad. They can be informative, educational, and entertaining. We should not ban advertisements completely, but we should also be aware of their manipulative nature and use critical thinking when weencounter them. As consumers, we should choose products wisely based on our own needs and preferences, instead of being swayed by advertisements.。

托福tpo 60综合写作范文一、阅读文章观点及理由。

阅读文章提出了一种观点，认为在公共图书馆放置电脑有很多弊端。

1. 干扰阅读氛围。

图书馆本应是安静阅读的地方。

电脑会发出各种声音，像按键声、提示音之类的。

人们在图书馆是想找个安静的角落沉浸在书的世界里，这些电脑的声音就像一个个小恶魔，打破了图书馆原有的宁静氛围，让那些想要好好读书的人不胜其烦。

2. 维护成本高。

电脑可不是个省心的家伙。

它需要定期更新软件，硬件要是出了毛病还得请专业人员来维修。

这可都是钱啊，图书馆的经费本来就有限，把钱花在这些电脑上，就会减少购买新书和其他资源的资金，这就像一个家庭本来打算买新衣服的钱，却拿去修那个总出故障的旧电器了。

3. 人们有其他上网途径。

现在这个时代，谁还缺个上网的地方呢？大家都有手机、平板电脑，家里也有电脑。

在公共图书馆设置电脑就有点多余了，就像在到处都是卖水的地方还非要在一个读书的地方摆个卖水的摊位一样。

二、听力文章观点及理由。

听力文章则对阅读文章的观点进行了反驳，认为在公共图书馆放置电脑是很有必要的。

1. 合理管理可避免干扰。

关于干扰阅读氛围这个事儿，其实很好解决。

图书馆可以专门划分出电脑区，就像把调皮捣蛋的孩子和认真学习的孩子分开一样。

在电脑区，大家可以自由使用电脑，而在阅读区，就还是安静的读书天堂。

而且，电脑也可以设置成静音模式，再加上现在的无线设备，很多操作都可以无声无息地进行。

这就好比把爱闹的小动物关进一个专门的小笼子，让它们在里面撒欢儿，却不影响其他动物休息。

2. 电脑带来新的资源和功能。

电脑虽然有维护成本，但是它带来的好处更多。

图书馆可以通过电脑提供电子书籍、在线数据库等资源。

这些资源可比单纯的纸质书丰富多了。

而且电脑还能提供一些特殊的功能，比如盲人可以使用电脑上的语音功能来听书。

这就像给图书馆这个知识宝库又开了几个新的大门，让更多的人可以用不同的方式获取知识，不能因为怕花钱就把这些好东西拒之门外啊。

12月20日托福写作真题答案及解析12月20日托福综合写作Integrated Writing:READNINGLISTENINGAlaska whales 和Iceberg属于两种不同的种类1两种动物的颜色不太一样1 由于海藻本身有色差，加之在不同的季节颜色不一样，所以被其覆盖的whale 看起来会darker一些；同时观察时节不一样，也影响了观察的结果。

2 生存的水域不一样2 两种动物的饮食习惯不一样：一种喜欢吃mammals, 故原地不同；另一种喜欢吃fish，故被Russia海域的鱼吸引走了。

3 年龄不一样3 用fin测年龄不靠谱。

在20岁之后，fin就停止生长了。

所以，实际年龄会比估计的年龄大一些。

12月20日托福独立写作题目Independent Writing:Out of the following three things, which one would you prefer to regulate in order to improve your health? 2012.1.13NA/2012.11.2ML1. The kind of food you eat2. The amount of exercise3. The amount of stress in your lifeModern society has turned humans into curious creatures. Our ancestors were highly active thanks to their hunter-gatherer lifestyle; they ate fairly balanced diets due to the limited availability of fats and simple carbohydrates; and they relied on stress as a survival mechanism that kept them alert during intermittent periods of danger. Now, many of us spend upwards of 8 hours a day sedentary at our jobs; we eat unbalance diets of pre-prepared foods in order to save time; and we are constantly stressed due to a never-ending bombardment of stressors coming from our contemporary lifestyle. Managing all three things--diet, exercise, and stress--would be a daunting task for anyone, so if I had to pick one thing to improve my health, it would probably be exercise.To begin with, exercise is much easier to manage than both your diet and your stress. In order to manage your diet effectively, need to reduce or eliminate certain foods you enjoy eating, as well as create a comprehensive plan that balances your intake of different nutrients like proteins, fats, and carbohydrates. This is too much for most people, which explains the prevalence of “fad diets” that involve, for example, only eating a single type of food; these diets rarely ever work, and can even be dangerous. Managing stress is similarly difficult, because there are so many potential stressors to account for (work, kids, bills, etc.) and it may not be plausible to try and manage all ofthem. Exercise, on the other hand, can be effective even when simple. Take running: This exercise requires no forethought and can be done pretty much everywhere by pretty much everyone, yet carries a laundry list of health benefits ranging from boosting the immune system to lower the risk of breast cancer.Also, exercise has the scientifically measurable benefit of improving mood. When we perform physically demanding activities such as running, the brain releases a rush of endorphins that produces feelings of euphoria. From an evolutionary perspective, this is a neurological reward that encourages us to run and be healthy--we’r e basically built to be runners. If you can incorporate running (or some similar form of exercise) into your weekly routine, you’ll notice your mood improve almost immediately. And there’s also another, indirect way exercise improves mood: When you’re fit, you feel much better about yourself. I don’t just mean in the narcissistic way, either-- knowing that you’re exercising is just a good feeling.Lastly, and perhaps most importantly, exercise can lead to both better eating habits as well as lower overall stress. Exercise is in fact an excellent way to manage stress, and is recommended by medical authorities as a way to strengthen the brain’s buffers against it. It is even recommended by doctors for treating depression. This stress reduction from exercise can in turn lead to better food choices, since stress is an major contributor to poor eating habits, and eating healthy is much easier when you’re feeling good about yourself. Anyone who’s reached for junk-food during a stressful situation can tell you that.Obviously, diet, exercise, and stress management are all important for living a healthy life. However, if you had to choose only one, I’d say that exercise wins out when it comes to getting the most bang for your buck.。

小编为托福考生们准备了托福综合写作TPO30,希望各位考生们在TPO写作真题里能够得到锻炼，祝广大托福考生能够取得理想成绩。

综合写作 Reading Part:A little over 2,200 years ago, the Roman navy attacked the Greek port cityof Syracuse. According to some ancient historians, the Greeks defendedthemselves with an ingenious weapon called a “burning mirror”: a polished coppersurface curved to focus the Sun’s rays onto Roman ships, causing them to catchfire. However, we have several reasons to suspect that the story of the burningmirror is just a myth and the Greeks of Syracuse never rally built such adevice.First, the ancient Greeks were not technologically advanced enough to makesuch a device. A mirror that would focus sunlight with sufficient intensity toset ships on fire would have to be several meters wide. Moreover, the mirrorwould have to have a very precise parabolic curvature (a curvature derived froma geometric shape known as the parabola). The technology for manufacturing alarge sheet of copper with such specifications did not exist in the ancientworld.Second, the burning mirror would have taken a long time to set the ships onfire. In an experiment conducted to determine whether a burning mirror wasfeasible, a device concentratingthe Sun’s rays on a wooden object 30 meters away took ten minutes to setthe object on fire; and during that time, the object had to be unmoving. It isunlikely that Roman ships stayed perfectly still for that much time, Such aweapon would therefore have been very impractical and ineffective.Third, a burning mirror does not seem like an improvement on a weapon thatthe Greeks already had: flaming arrows. Shooting at an enemy’s ships with flaming arrows was a common way of setting the ships on fire. The burning mirror and flaming arrows would have been effective at about the same distance. So the Greeks had no reason to build a weapon like a burning mirror.综合写作 Listening Part:The claims that the burning mirror would have been impractical and technologically impossible are unconvincing.First, the Greeks did not need to form a single sheet of copper to make a large, burning mirror. An experiment has shown that dozens of small individually flat pieces of polished copper could be arranged into aparabolic shape and form a large, burning mirror. The Greek mathematicians know the properties of the parabola and so could have directed the assembly of small mirror pieces into the parabolic shape.Second, about how long it would take to set a ship on fire with a burning mirror. The experiment the reading selection mentions assumes that the burning mirror was used to set the wood of the boat on fire, that’s what takes ten minutes. But Roman boats were not made just of wood. There were other materials involved as well. For example, to seal the spaces between wooden boards and make them waterproof, the ancient boat-builders used a sticky substance called pitch. Pitch catches fire quickly. An experiment showed that pitch could be set on fire by a burning mirror in seconds. And once the pitch was burning, the fire would spread to the wood even if the ship was moving. So a burning mirror could have worked quickly enough to be an effective weapon.。

托福雅思综合写作范文解析今天原文及范文解析，托福综合写作是写作部分的第一个题目，一般大家会阅读到一段文字，然后听到一段内容，两个内容是话题相关但是观点相反的，所以需要大家认真分析之后写作。

TASK 1 Integrated WritingGlass is a favored building material for modern architecture, yet it is also very dangerous for wild birds. Because they often cannot distinguish between glass and open air, millions of birds are harmed every year when they try to fly through glass windows. There are, however, several solutions that responsible businesses can use to prevent injuries to birds.One-Way GlassOne solution is to replace the regular, clear glass with one-way glass that is transparent in only one direction. The occupants of the building can see out, but birds and others cannot see in. If birds cannot see through a window, they will understand that the glass forms a solid barrier and will not try to fly through it.Colorful DesignsA second solution is to paint colorful lines or other designs on regular window glass. For example, a window could have a design of thin stripes painted over the glass. People would still be able to see through the openings in the design where there is no paint, while birds would see the stripes and thus avoid trying to fly through the glass. Architects can be encouraged to include colorful painted patterns on glass as part of the general design of buildings.Magnetic FieldThe third solution is to create an artificial magnetic field to guide birds away from buildings. Humans use an instrument called a magnetic compass to determine directions —either north, south, east, or west. Bird research has shown that birds have a natural ability to sense Earth’s magnetic fields; this ability works just like a compass, and it helps birds navigate in the right direction when they fly. A building in a bird flight path can be equipped with powerful electromagnets that emit magnetic signals that steer birds in a direction away from the building.Now listen to part of a lecture on the topic you’ve just read about.None of the solutions you’ve read about will effectively stop birds from getting injured. First, replacing regular glass with one-way glass. Well, the problem withone-way glass is that to the bird on the outside, a one-way glass surface reflects just like a mirror. And a surface that reflects like a mirror is just as bad as regular glass for birds because birds don’t understand mirrors. If they see a reflection of the sky in a mirror or of a tree in the mirror, they think the reflection is the sky or is the tree and they’ll fly right into them.The second solution, painting colorful patterns like stripes on regular glass, also has problems. As the reading said, these designs include openings so people inside the buildings can see out. But birds will perceive these unpainted openings as open holes. And if birds think they’re seeing holes, they will try to fly right through them. To prevent birds from doing this, the unpainted spaces in the window would have to be extremely small. But that would then make the rooms of the buildings too dark for the people inside them.The third solution, creating an artificial magnetic field, won’t work very well, either. While it’s true that birds use Earth’s magnetic field to help them navigate, they use this only when they’re traveling very long distances. For example, if a bird is migrating from a cold country to a warm one during winter, it will use its magnetic sense to figure out which way it should fly. But this ability isn’t used to go over short distances such as going from one side to the city to another. For short trips, birds use their eyes and the brightness of light to determine where to go so magnetic signals from buildings won’t have much effect.Summarize the points made in the lecture. Be sure to explain how they cast doubt on the specific solutions proposed in the reading passage.DirectionsYou have 20 minutes to plan and write your response. Your response will be judged on the basis of the quality of your writing and on how well your response presents the points in the lecture and their relationship to the reading passage. Typically, an effective response will be 150 to 225 words.Essay TopicSummarize the points made in the lecture, being sure to explain how they cast doubt on the specific solutions proposed in the reading passage.You must finish your answer in 20 minutes本文是托福tpo42综合写作原文及范文解析。

托福综合写作范文真题解析．托福综合写作范文真题解析这些如果应对托福综合写作的听力内容和阅读内容?托福综合写作应该如何写?都是考生在备考时应该掌握的，这样才能在考试中为你的托福综合写作提分。

托福这里小站教育编辑就为大家带来了托福综合写作的真题解析，希望对大家写作提分有帮助。

这里小站教育名师用TPO29的托福综合写作为例为大家详解托福综合写作的解题全过程，希望对大家备考托福写作有帮助。

阅读内容：Large numbers of dinosaur fossils have been discovered in deposits on Alaska's North Slope, a region that today experiences an extremely cold, arctic climate. One hundred million years ago, when those dinosaurs were alive, the environment of the North Slope was already inhospitable, especially during the winter when it experienced several months of total darkness. How did the dinosaurs survive the wintertime? Paleontologists have proposed that one of the most common North Slope dinosaurs, the elephant-sized Edmontosaur (Edmontosaurus), survived the winter by migrating south to more hospitable regions. Several arguments support the migration hypothesis.现今经历极寒，拥有北极气候的阿拉斯加北坡，发掘出了大量恐龙化石。