托福听力模考TPO13真题(附带答案)

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托福听力模考TPO13真题(附带答案)

摘要：如果说备考托福听力用什么材料最好，那无疑是TPO了，TPO目前一共有34套，小马资料频道为帮助大家备考，位考生提供TPO全套真题下载，包括TPO听力原文、MP3、答案解析，本次为大家分享的是托福听力模考TPO13真题(附带答案)，欢迎大家下载。

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TPO 13 Lecture 4Astronomy

Narrator:

Listen to part of a lecture in an astronomy class.

Professor:

OK, I wanna go over the different types of meteoroids, and what we've learned from them about the formation of earth, and solar system. Uh… the thing is what's especially interesting about meteoroids is that they come from interplanetary space, but they consist of the same chemical elements that are in matter originated on earth, just in different proportions. But that makes it easier to identify something as a meteoroid, as it opposed to…to just a terrestrial rock. So to talk about where meteoroids come from, we need to talk

about comets and asteroids, which basically...they’re basically made up of debris left over from the origin of the solar system 4.6 billion years ago....

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