官方真题Official35托福听力Lecture4对话原文免费分享(原TPO)

1、资料来源：来自本人网络整理！祝您工作顺利！官方真题official35托福听力lecture4对话原文免费分享(原tpo) 官方真题official模考软件始终是考生不行或缺的一个备考工具，许多托福考生都在用这个。为了让大家更好的用法这个官方真题official资料，这里小站训练编辑为大家整理了完好的官方真题official真题文本、题目及答案解析，盼望对大家托福备考有关心。 官方真题official35托福听力lecture 4对话原文免费共享(原tpo) 官方真题official 35-l4 narrator: listen to part of a lecture in an earth

2、 science class. professor: lets review something from last week. we talked about an event that happened 65 million years ago. anyone? student: an asteroid hit earth. um.well, we think an asteroid hit earth, near the yucatan peninsula, in mexico, and that wiped out all the dinosaurs. professor: right

3、. i wouldnt say that weve got 100% proof, but theres very strong evidence that this is why that mass extinction occurred. okay. but did you know there was an earlier extinction far greater than the one that killed off the dinosaurs? it was what we call the permian extinction. now, way back about 290

4、 million years ago, at the beginning of the permian period, there was just one big continent, a super continent. and as the climate warmed up, plant and animal species began to diversify profusely. so life during the permian period was abundant and diverse. but about 250 million years ago, the permi

5、an period ended with a rapid mass extinction, something happened that wiped out 75% of the land animals and over 95% of ocean life. so what was it? what could have caused this? well, with the all the evidence that it was an asteroid that led to the dinosaur extinction, we began asking ourselves: is

6、it possible that another asteroid much earlier caused the permian extinction? and so researchers have been looking for an impact crater. well, with the all the evidence that it was an asteroid that led to the dinosaur extinction, we began asking ourselves: is it possible that another asteroid much e

7、arlier caused the permian extinction? and so researchers have been looking for an impact crater. student: i thought the permian extinction was caused by a decline in sea water oxygen levels. isnt that whats in the textbook? professor: but dont forget the textbook makes it very clear thats only a the

8、ory. student: and it mentions something about volcanic eruptions too. professor: it does, but now this new theory has led to a search for evidence of an asteroid impact. and one place of interest is a region called wilkes land in eastern antarctica. a few years ago, a researcher reported a strange a

9、nomaly beneath the ice in wilkes land. evidence of what may be a mascon. thats just short for mass concentration. when an asteroid hits earth, when it slams into earths crust, we think that causes molten rock from deep below the surface to rise up into the impact area. sort of like if you bump your

10、head, you get a big lump under the skin. fluid makes the area swell. anyway, the material flowing up from below the crust is more dense than the crust itself. so thats how we get a mascon, a spot in the crust with newer crust material thats more dense than the material all around it. therere lots of

11、 mascons on the moon too, where a mascons density causes a small increase in the local gravity that can be measured and mapped by orbiting spacecraft. and where do these mascons tend to be found? in the centers of impact craters on the moons surface. but back to wilkes land. were not certain that th

12、e mascon there.what might be a mascon .was actually caused by the impact of an asteroid, but there does seem to be evidence. researchers notice a gravity anomaly similar to those on the moon. and the spot where the gravity readings are especially high.this is right in the middle of a 500-kilometer w

13、ide, circular ridge, what could be part of an old impact crater. and if there was an asteroid impact there in wilkes land, the next question is: did it happen 250 million years ago? because that would put it when in geologic history? student: at the end of the permian period? right when those animal

14、s went extinct. professor: exactly. student: but cant researchers figure that out by studying the rocks there in wilkes land.where this impact supposedly took place? professor: well, to get to anything from that long ago, we would have to drill down to about a mile, about 1.6 kilometers of solid ice

15、 that covers the area today. and thats not likely to happen. but speaking of rocks, i should mention that wilkes land is not the only place of interest here. theres another called the bedout high off the coast of australia. and we have rock samples from the bedout high. some apparently have extrater

16、restrial origin. i mean, they show the effects of extreme temperatures and pressures, the level of extremes produced only by an impact. and as for their age, well, they do in fact, date back to about 250 million years ago. 怎样用单词推断托福听力对话 场景方法可行的缘由仍在于ets的出题原那么，大家确定已经特别熟识托福听力考试中的同学生活原那么，它是ets坚决不移的出题原那么

17、，这一原那么使托福听力从内容上永久离不了同学生活这一中心。同学生活的圈子是很小的，学校的校内也就那么大一点儿，而托福听力已经考了几十年了，所以学校里的每一寸上都不知被考过多少遍了。过去考的是这些东西，将来考的仍是这些东西。考生在考前只要把学校里的主要场所(如图书馆、食堂等)中常发生的重要而又典型的同学生活场景加以熟识，寥寥几个词便可以知道整个段子或对话的根本内容，而答案也就唾手可得。 这一方法所需的预备工作相当简洁，较次要的场所和少见的场景考生甚至可以置之不理。但它的作用又相当大，在此列出三点，略作说明:作用一，做过一些托福听力题的人都会有种感觉:即托福听力，尤其是小对话题中有相当数量的题目仅

18、靠听清字面意思尚做不出答案，还必需生动形象地想象出对话发生的详细环境和生活场景。在这里场景的方法是一个必需，考生的英语程度再高，语言力量再强都无助于这些题目的得分。 场景方法可为考生供应更加有效的技巧，而且这些技巧的有效程度也更加令人惊讶。 同学生活原那么打算了托福听力中涉及的常见生活场景的有限性和它们的高重复率。它们必定是同学的日常学习生活中最为普遍、最易发生的场景。这些场景中所牵扯到的内容和人们常说的话又是固定的，这种固定性是由客观的生活现实打算的。而ets出题人肯定不会歪曲现实，这是由他们所谓出题原那么打算的。所以只要考生抓住了这些固定的内容和相关的固定词汇、句型，就抓住了众多绝妙的技巧

19、。 例如托福听力有许多谈及音乐会的对话，而一旦谈到音乐会，话题永久都是固定死了的。全是好话，一句坏话没有，全部的题目都在说:昨天晚上的音乐会可真好啊!我们过的可真是个wonderfu1 time啊!票可真难买啊!人可真多啊!别说坐着啦，能站着就不错啦!过道上全是人!所以也不需要听力程度太好，只要粗略地听明白:嗅!这又是谈音乐会的啊!再看选项有一个写着:the concert is excellent.选它就是了! 各位已经知道，同学生活是托福听力考试的核心，同学最关怀的事也是最简单考到的，因此谈到课程、考试的对话和段子可谓层出不穷。假设在一个对话题中听到第一个人在问:某门课程难不难?(is t

20、he course hard or not?)，那么无须听其次人的答复即可知答案确定是难。又如在一个对话题中只要听到两人是在议论某位教师要求严不严，其余的话别听了，答案确定是严! 又如托福听力中有大量谈及食物这个场景的。在这个场景中只要谈到apple pie，答案确定是好吃，考生照好吃去选确定没错;而谈到pizza答案确定是难吃，考生照难吃去选也确定没错。 这些托福听力技巧在托福听力备考过程中根本上得到验证，大家可以依据自己的阅历总结出更多技巧。 托福听力材料应当怎样用法 托福听力的文本是肯定要在听完之后认真的进展分析的，每一句里的词汇首先都要弄清晰。其次，每个句子的核心愿思你要可以听得出来。再者，整个段落的中心愿思也需要你多听多练进展把握。还有要在听完每篇文章后反复分析其中涉及到的考点。比方说为什么在这个地方出题了，考点是什么。这样就可以便利之后遇到类似的状况还是答不出来的状况 有些专业性很强的文章也要研读吗 当然需要了，不过你需要研读的更多的是文章里的考点。那么这些考点不只在这篇文章里可以用法，也可以在另外一篇不同话题的文