- 2017年06月12日14:24 来源：小站教育作者：小站托福编辑
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官方真题Official 37 L1
1. What is the lecture mainly about?
A. The differences between mineralization and weathering.
B. Processes that remove minerals from soil.
C. Factors affecting the fertility of soil.
D. Several processes involved in the creation of soil.
So, we all know soil. It's important to plant growth, right? And we know that there're different types of soil in different places and that some soils are more fertile than others. But what is soil? And how's it formed? Well, we're going to go into this in some depth, but for now let's just lay down the basics. 教授开头的这段话，尤其是But what is soil和how is it formed这两句点明了这篇讲座的主旨，就是分析土壤的成分和形成。结合后文全文我们也知道，这篇讲座的确讲了土壤的形成。选项D符合原文。其余三个选项都属于不全概括或者无关原文。选择D。