托福听力TPO15真题原文附带音频.docx

智课网TOEFL备考资料托福听力TPO15真题原文附带音频 摘要： 备考托福听力所使用的材料尤为重要，而TPO都是ETS之前考过的真题，对于考生模拟考试和复习具有很大的价值。小编在这里为大家分享托福听力TPO15真题原文附带音频，这是TPO听力中的一部分，在接下来的时间里小编还将与大家分享更多。 托福 听力的备考首选的资料那就要数TPO了，这是份非常值得大家备考和练习的资料，今天小编仅仅为大家带来部分内容 托福听力 TPO15真题原文附带音频，我们一起来看看吧。 TPO 15 Lecture 4 Biology Narrator: Listen to part of a lecture in a biology class. Professor: OK. Weve been talking till now about the two basic needs of a biological community an energy source to produce organic materials, you know ah, food for the organism , and the waste recycling or breakdown of materials back into inorganic molecules, and abo ut how all this requires photosynthesis when green plants or microbes convert sunlight into energy and also requires microorganisms, bacteria, to secrete chemicals that break down or r ecycle the organic material to complete the cycle So, now we are done with this chapter of the textbook, we can just review for the weekly quiz and move on to the next chapter, right? Well, not so fas t. First, I d like to talk about some discoveries that have challenged one of these fundamental assumptions about what you need in order to have a biological community. 考生们无论备考托福的哪一部分，TPO都是非常适合的材料，我们为大家提供的托福听力TPO15真题原文附带音频都是经过精编处理过的内容，考生们可以直接下载使用，同时我们也为大家提供了在线下载和移动下载两种方式，方便大家随时随地的备考。 相关推荐: 托福听力下载 托福