托福tpo23 听力问题

你说的是dolphin的那个文章吗？还是第四个？

dolphin的第一题：
原文：
Professor: We have been talking about how sea animals find their way underwater, how they navigate, and this brings up an interesting puzzle, and one I'm sure you'll all enjoy. I mean, everybody loves dolphins, right?
And dolphins, well, they actually produce two types of sounds. Uh, one being the vocalizations you are probably all familiar with, which they emit through their blowholes. But the one we are concerned with today is the rapid clicks that they use for echolocation, so they can sense what is around them. These sounds, it has been found, are produced in the air-filled nasal sacs of the dolphin.
And the puzzle is how does the click sounds get transmitted into the water? It's not as easy as it might seem....
选项：
A Parts of the dolphin anatomy that allow it to navigate
B Two different types of communication used by dolphins

这是听力最开始，这里提到了这节课的中心：an interesting puzzle， 既是 the puzzle is how does the click sounds get transmitted into the water。 首先，研究的对象是海豚navigate的方法，不是与其它海豚communicate的方法。其次，尽管教授提到了海豚有两种不同的发声办法，但是今天这节课的重点是第二种发声方法，即快速click造成的声音。而且在后来的讲课中你也发现，她解释的重点是海豚大脑的特殊构造如何工作，使得这种声音能够传输到水中。B是一个很有迷惑性的选项。

至于第三题，不是多选题，所以我不知道你要问的是哪个文章了。
（第三题的话答案原文中很明显：Well, turns out dolphins have a structure in their foreheads, just in front of their nasal sacs, called a melon. Now, the melon is kind of a large sac-like pouch, made up of fat tissue. And this fat tissue has some rather fascinating acoustical properties...）

section2 第二篇 讲海豚
第一题 教授讲了海豚有两种声音navigate方式，然后说我们今天来介绍那种可以使海豚sense location 的方式 所以并没有讨论两个 所以总的来说只介绍了一个 B错
第三题 等下~