下面就让小编来为大家介绍一下这篇托福听力TPO7学习笔记的相关内容吧，这是小编的一些见解，以便帮助大家更加充分的理解TPO真题，希望能够给正在准备托福听力的考友们带来帮助。
一、难词注解
Glacier 冰河;冰川
Crystallized adj. 裹有糖霜的;蜜饯的v. 结晶(crystalize的过去分词)
Gravity n. 重力，地心引力;严重性;庄严
Basal 基部的;基础的
Overlying 上覆盖;上覆盖的
Friction 摩擦;摩擦力
Lubricant n. 润滑剂;润滑油adj. 润滑的
Oozing 渗出
extension and compression 伸张和压缩
crevasses 裂缝;破口
bedrock 基岩;根底
二、长难句分析
Now, there are a couple of factors that affect the amount of deformation that takes place or the speed of the glacier’s movement for example.
难词释义：
deformation n. 变形
难句类型：
That引导的定语从句， factors that+从句，先行词在从句中做主语， deformation that+定语从句。
三、考题对应考点
12.Now, even though it may be difficult to understand how a huge mass of ice can move or flow, it’s another word for it, it’s really known that no secret that the glaciers flow because of gravity. But how they flow, the way they flow, needs some explaining.开头原则中的课堂回顾式和转折原则，But后面的how they flow, and the way they flow needs some explaining是重点，教授在接下来的 lecture 中解释了这个问题。所以答案应选 A
13.Basal slip or sliding as it’s often called, basically refers to the slipping or sliding of a glacier across bedrock, actually across a thin layer of water on top of the bedrock. So, this process shouldn’t be too hard to imagine. 过程原则，教授分析basal slip 的过程，首先是冰山底部的冰受到巨大的压力熔点降低，在冰山底部形成液体层，于是冰山和岩床中间的摩擦力减小，冰山就开始滑动。所以正确的顺序是1：C 2：B 3：D 4：A
14. there are a couple of factors that affect the amount of deformation that takes place or the speed of the glacier’s movement for example. Deformation is more likely to occur the thicker the ice is, because of the gravity of the weight of the ice. And temperature also plays a part here,教授提到 there are a couple of the factors that affect，第一点： Deformation is more likely to occur the thicker the ices;第二点：temperature also plays part here。由此可以看出冰层的厚度以及温度是影响 deformation 的两大因素。也就是AD选项。
15.Now, speeds like that are pretty unusual, hundreds of times faster than the regular movement of glaciers, but you can actually see glacier move during these surges, though it is rare. 强调原则和转折原则，Now提示大家注意，but后面的内容是重点。教授的最后一句话提到，虽然很少见，但是 you can actually see glacier move during these surges。说明冰山的移动可以达到肉眼可见的地步，所以 B 选项正确。
16.Now the next type of movement we will talk about is called: deformation. You’v already known that ice is brittle, if you hit it with a hammer, it will shatter like glass. But ice is also plastic, it can change shape without breaking. If you leave, for example, a bar of ice supported only at one end, the end, the unsupported end will deform under its own weight,转折原则以及举例原则，在这段话里，教授讲的是一种 deformation 的情况，而 deformation 就是 A characteristic of ice that is related to glacial movement，所以 A 选项正确。
17.let’s touch briefly on extension and compression. You textbook includes these as type as a particular type of glacier movement, but you will see that these are … cause many textbooks that omitted as type of movement as included. And I might not include right now, if there won’t in your textbooks.教授的意思是如果学生的教科书中没有把 compression and extension 列为一种冰山运动的方式的话，他将不会有所提及，这表明教授本身并不完全赞同把compression and extension 当做一种冰山运动的方式。所以 C选项正确。
听力文本结构框架：
这个讲座主要讲的是冰川怎样浮动的。第一种冰川滑行叫基面滑移指冰川在基岩上的滑动。第二种是冰川的变形，最后提到冰川的拉张与挤压。
以上就是小编的托福听力TPO7学习笔记中关于lecture4的内容，大家在平时备考时也要注意经验和技巧的积累，更多的笔记内容小编稍后为您呈现。最后，小编祝大家在托福考试中取得好成绩！
您还可能关注：
