下面就让小编来为大家介绍一下这篇托福听力TPO10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
Dweller 居住者;居民
Aquatic adj. 水生的;水栖的;在水中或水面进行的n. 水上运动;水生植物或动物
Sperm n. 精子;精液;鲸蜡油
Baleen n. 鲸须
Limb n. 肢，臂;分支;枝干 vt. 切断…的手足;从…上截下树枝
Descendant n. 后裔;子孙adj. 下降的;祖传的
Hippopotamus n. [脊椎] 河马
Pelvis n. 骨盆
二、长难句分析
I mean, that a four-legged land and river dweller could be the evolutionary source of a completely aquatic creature up to 25 times its size? 我是说，一个在河里生活有四条腿的陆生生物能成为比自己大25倍的水生生物的进化源么?
难词释义：
dweller n. 居民，居住者
aquatic n. 水上运动;水生植物或动物adj. 水生的;水栖的;在水中或水面进行的
难句类型：
That+宾语从句
难句拆分：
the evolutionary source of ……的进化源，up to 25 times its size，比它的尺寸大25倍
三、考题对应考点
6.We know whales are mammals and that they evolved from land creatures. So the mystery is figuring out how they became ocean dwellers. 开头原则的直入主题式，后面都在介绍鲸鱼从陆生动物变成海洋动物的过程并很难确定这个发展历程，所以选择B.
7.教授首先告诉大家Ambulocetus 的名字的意思就是walking whale that swims，提示了Ambulocetus 和鲸鱼之间可能有告诉的相关性，接下来则提到了一些正面Ambulocetus 可能是鲸鱼和陆生哺乳动物之间的过渡的特点：It clearly had four limbs that couldn’t have been used for walking，即答案D;It also had a long thin tail, typical of mammals, something we don’t see in today’s whales，即答案C;it also had a long skeletal structure，即答案A.
8. Now these discoveries don’t completely solve the mystery. I mean, Ambulocetus is a mammal that shows a sort of bridge between walking on land and swimming. But it also is very different from the whales who know today. So really we are working just a few pieces of a big puzzle.强调原则和转折原则，由bridge可知 Ambulocetus 是鲸鱼和陆生哺乳动物之间的一个过渡，说明Ambulocetus 的发现填补了这个过渡期中的一些空白。B、C、D 在材料中都没有被提及。
9.we compared some whale DNA with DNA from some other species, we got quite a surprise. The DNA suggests that whales are descendants of the hippopotamus，强调原则，we got quite a surprise，惊喜的内容就是考点，所以答案选择B，因为鲸鱼的DNA 和hippopotamuses 的相似。
10. So we have contradictory evidence. And more research might just raise more questions and create more controversies. At any rate, we have a choice. We can believe the molecular data, the DNA, or we can believe the skeleton trail, but unfortunately, not both.转折原则，but unfortunately,否定前面的内容，理论与实际是冲突的，所以选择C.
11.for the toothless whales, like the blue whale and other baleen whales, we assumed that they be closely related. But recent DNA studies suggest that that’s not the case at all.举例原则以及转折原则，But 出现要注意喽，说明有牙齿的鲸鱼在DNA 上并不一定相近。所以答案应该选C.
听力文本结构框架：
这篇讲座主要讲的是鲸鱼由路上生物进化为海洋生物的证据。首先说到陆生鲸的化石分析可见鲸鱼是陆生生物。接着，又把路行鲸鱼和现在鲸鱼的DNA作比较，它们之间有一定的相似性。通过把DNA的比较发现鲸鱼是河马的远方亲戚。
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