TPO64综合口语Task4听力原文+MP3+范文下载

TPO64综合口语Task4听力原文+MP3+范文下载

TPO64综合口语Task4听力原文：

Listen to part of a talk in an environmental science class.

There's one more method of forest conservation I wanna talk about before we end today. And that's forest fires. It may come as a surprise to many of you, but fire is a key element of many ecosystems. For example, It's a natural normal process that helps maintain a healthy forest For decades， we believed fire should be suppressed at all costs, so they were put out as quickly as possible to preserve the environment. But in the last 20 years or so, we've come to realize the advantages of regular controlled fires to an ecosystem. In fact，a lot of plant species depend on fire for survival. In a forest full of pine trees, for example, fire is necessary for reproduction. Pine trees in particular, need fire in order to spread their seeds. Pine trees of course have pine cones, which contain their seeds. So what happens is that the heat from a fire melts the...此处省略一半听力原文！

TPO64综合口语Task4题目：

Using the examples from the lecture, explain why forest fires are beneficial to the forest ecosystem.

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