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TPO 35-L4
1. D选项正确
判断依据如下：
由上节课内容和问句引出本文主旨：Permian时期生物灭绝的原因："Ok, but, did you know there was an earlier extinction far greater than the one killed out the dinosaurs? It was what we call the Permian Extinction."故选项D正确。
• A选项说"有关恐龙灭绝的新证据“，未提及，故排除。
• B选项说"收集大灭绝证据的新方法“，未提及，故排除。
• C选项说"Permian时期两种质量浓度的关系“，未提及，故排除。
2.C选项正确
判断依据如下：
“Well, with all the evidence that it was an asteroid that led to the dinosaur extinction. We began asking ourselves, is it possible that another asteroid much earlier caused the Permian extinction? And so researchers have been looking for an impact crater. ”
文章中提到是因为后来的小行星碰撞地球引起恐龙灭绝，所以他们开始考虑之前的灭绝是不是也是小行星碰撞造成的，故选项C正确。
• A选项说“他们发现月区域上的质量浓度的不同是由小行星碰撞引起的”，符合原文，但不符合题意，故排除。
• B选项说“他们发现Wilkes Land的岩石已经2.5亿岁了”，文章中未提及Wilkes Land的岩石情况，故排除。
• D选项说“水中氧气减少的理论是错的”，文章说氧气减少仅仅只是个理论，但并未明确说出是错的，故排除。
3.A选项正确
判断依据如下：
“Evidence of what maybe a mascon. That’s just short for mass concentration. When an asteroid hits earth, when it slams into earth crust, we think that causes molten rock from deep below the surface to rise up into the impacted area, sort of like if you bump your head, you get a big lump under the skin.
Fluid makes the area swell. Anyway, the material flowing up from below the crust is more dense than the crust itself. So that’s how we get a mascon, a spot in the crust with newer material that’s more dense that the material all around it. ”
文章中在提到mason形成过程的时候，用head来举例形象说明，故选项A正确。
• B选项说“为了说明超大陆是如何分离的”，未提及，故排除。
• C选项说“为了说明小行星和恐龙灭绝的关系”，错位，故排除。
• D选项说“为了把恐龙灭绝和Permian灭绝作比较”，无关对比，故排除。
4.D选项正确
判断依据如下：
“Researchers noticed a gravity anomaly similar to those on the moon. And the spot where the gravity readings are especially high, this is right in the middle of a 500 kilometer wide circular ridge. What could be part of an old impact crater. ”文章中说，月球上的mascon是由小行星引起的，而Wilkes Land也有类似的mascon，故选项D正确。
• A选项说“含有较高浓度氧的冰”，未提及，故排除。
• B选项说“地壳上的一部分密度较正常密度偏低”，文章说mascon为密度较正常密度偏高，与原文相反，故排除。
• C选项说“冰下面的来自于外地球的岩石碎片”，“外地球的岩石”有提及，但是错位，故排除。
5.BC选项正确
判断依据如下：
“And we have rock samples from the Bedout High. Some are apparently of extra-terrestrial origin. I mean they show the effects of extreme temperatures and pressures, the level of extremes produced only by an impact. And ask for their age? Well, they do, in fact, date back to about 250 million years ago.”
文章中明确指出Bedout High的岩石的特点，分别对应BC选项，故选项BC正确。
• A选项说“它们很像Yucatan peninsula的岩石”，无关对比，故排除。
• D选项说“他们有现在已经灭绝的动物的化石”，未提及，故排除。
6. B选项正确
判断依据如下：
重听句：
Professor
But don’t forget, the textbook makes it very clear —— that’s only a theory.
还原语境：
Female Student
I thought the Permian extinction was caused by a decline in sea water oxygen levels. Isn’t that what’s in the textbook?
Professor
But don’t forget, the textbook makes it very clear —— that’s only a theory.
重听题需要根据语境来判断。学生在分析问题原因的时候，老师说这个原因仅仅是一个理论，说明这个理论并不令人信服，但是学生却把它误解成真实原因，故选项B正确。
· A选项说“学生在上课之前需要先读作业”，和本题语境无关，故排除。
· C选项说“学生没有找到充足的理论来驳斥书中的理论”，与原文相反，故排除。
· D选项说“学生提出的理论是最合理的”，与原文相反，故排除。
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