Step1: 听段落 找关键词 完成题目
每段话只听一遍，用最精简的方式，记下所有关键词及关键词引导的内容，体会关键词引导的内容的重要性
第一段：
3.According to the professor, what is a major weakness of the classification system that is based on animals’ physical characteristics?
A. It can show the relationships only among a small number of animal species.
B. It requires technology that is not widely available.
C. It cannot account for characteristics that first appeared in the recent geologic past.
D. It cannot determine whether similar characteristics developed in similar ways.
第二段：
5.According to the professor, why do some biologists doubt that magnetite helps birds navigate?
A. Its magnetic properties are quite weak.
B. It is found in young birds that cannot fly yet.
C. It is found in all albatross species.
D. It is in birds that do not migrate.
第三段：
2.According to the professor, what is the main argument against the theory that the stone blocks of the Great Pyramid were lifted into place with cranes?
A. Wood Cranes would have been too weak to lift the blocks.
B. There is no evidence of ancient Egyptians ever using cranes.
C. The use of cranes would have resulted in imprecise dimensions.
D. There would not have been enough room for a platform for the cranes.
第四段：
5.What is a skeuomorph?
A. An object with a similar function as another, but with a different design
B. A copy of an object, but made from a different material
C. An exact copy of an object made hundreds of years earlier
D. An object designed to have multiple functions
第五段：
2.What leads scientists to believe that Saturn’s rings are much younger than the planet itself?
A. Most of the rings are bright and shiny.
B. Most of the rings are composed of complex materials.
C. The rings are much thinner than scientists realized.
D. There are small moons in between Saturn’s rings.
Step2: 看视频讲解 找自己问题
看总共有多少关键词，记下来没听出来的关键词，以及理解和记忆有差距的部分
第一段视频讲解：
第二段视频讲解：
第三段视频讲解：
第四段视频讲解：
第五段视频讲解：
Step3: 重新听句子
重点听第一次没听出来的关键词；分析句子中出现的没听出来或者听错的语言现象。没听出来的关键词要反复听，直到对这个关键词有非常强的反应
第一段：
Traditionally, to understanding evolutionary relationships, we looked at various easily observed physical characteristics of animals, their skeleton, the size of their brain, and… and then classify them based on similarities and differences. The problem with this method is that characteristics that appear similar may actually have developed in quite different ways. For example, some venoms are chemical-based, and others are bacteria-based, so they clearly had to have developed along different routes and may not be as closely related as we thought.
第二段：
We have found in birds a mineral called magnetite, which we think might be somehow related to this, because magnetite is a natural magnet. But the problem is that we’ve also found magnetite in non-migratory birds, which suggests that it may in fact serve a completely different function, not related to navigation at all.
第三段：
Of course, there’ve been a lot of theories over the centuries.
The oldest recorded one is by the Greek historian Herodotus. He visited Egypt around 450 B.C.E., when the pyramid was already 2000 years old. His theory was that cranes were used, much like we use cranes today to construct tall buildings. And Herodotus may have seen Egyptians using cranes made of wood.
But the problem with this theory has to do with simple mechanics. A crane needs a wide and sturdy base to stand on or it will fall over. Well, as you get toward the top of the pyramid, there’s really no place for a crane to stand. The stone blocks are too narrow to provide a base. Well, so much for that theory.
第四段：
The form of a pot can give us some ideas about its function of…the suitability of the pottery to serve a specific function. However, we have to be careful when it comes to skeuomorphs. These objects are copies of the designs of other objects, but in another material. And this can be problematic, because sometimes the new or different material is not well suited to the design.
第五段：
As you know, it’s believed that Saturn and all the planets in our solar system, coalesced from a swirling cloud of gas some 4.8 billion years ago. However, if the rings are made of leftovers from that process, then they’d also be about 4.8 billion years old. The problem is that anything gathering space dust for that long would certainly have darkened by now. But Saturn’s rings, most of them anyway, are pristine, so bright and shiny that they make Saturn “the jewel of the solar system”. So the hypothesis that the rings are just made of material left over from the time of planetary formation, that hypothesis must be wrong. Saturn’s rings are much younger than the planet itself. They may have formed only a few hundred million years ago, around the time the earliest dinosaurs lived on earth.
Step4: 总结
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