Question 3 is based on the conversation you have just heard.

M: Tonight, we have a very special guest. (1) [Mrs. Anna Sanchez is a three-time Olympic champion and author of the new book To the Edge.] Mrs. Sanchez, thank you for joining us.

W: Thank you for having me.

M: Let’s start with your book. What does the title “To the Edge” mean? What are you referring to?

W: (2) [The book is about how science and technology has helped push humans to the edge of their physical abilities.] I argue that in the past 20 years, we’ve had the best athletes the world has ever seen.

M: But is this a fair comparison? How do you know how, say, a football player from 50 years ago would compare to one today?

W: Well, you are right. That comparison would be perhaps impossible to make. But the point is more about our knowledge today of human biochemistry, nutrition, and mechanics. (3)[ I believe that while our bodies have not changed in thousands of years, what has changed is the scientific knowledge. ]This has allowed athletes to push the limits of what was previously thought possible.

M: That’s interesting. Please tell us more about these perceived limits.

W: The world is seeing sports records being broken that could only be broken with the aid of technology, whether this be the speed of a tennis serve or the fastest time in a hundred-meter dash or 200-meter swimming race.

M: (4)[ Is there any concern that technology is giving some athletes an unfair advantage over others? ]

W: That is an interesting question and one that has to be considered very carefully. Skis, for example, went from being made of wood to a metal alloy, which allows for better control and faster speed. There’s no stopping technological progress. But, as I said, each situation should be considered carefully on a case-by-case basis.

3. What has changed in the past thousands of years?（在过去的几千年里什么发生了变化？）

解析：B。在录音中间部分，女士提到，她认为在过去的几千年里我们的身体没有改变，改变的是科学知识，B项的science knowledge属于原词复现，因此选B。本题需要注意录音中说到的改变和未改变的各是什么，以及题干具体问的是什么。

错项排除：A项中的physical structure对应录音中的our bodies，但这是属于没有改变的，而题干问的是改变的东西，故排除。C项和D项利用录音中的biochemistry和nutrition进行干扰，但录音中女士说的是，我们对人类生物化学和营养学方面的了解很重要，并不是“生化过程”或“营养观念”发生了变化，故C、D两项错误。