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TPO 9 听力Lecture第2篇 第4题
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题目
Why are nutrients in the soil NOT carried away by spring runoff?
The roots of shrubs prevent nutrient-filled soil from being washed away.
Most nutrients are not in the area of the soil most affected by runoff.
Most nutrients remain frozen in the permafrost when spring runoff is at its peak.
Most nutrients have been absorbed by vegetation before the runoff period begins.
题目解析
根据教授所说：Well, much of the soil is usually still frozen during peak run-off. And the nutrients are deep down in the active layer anyway, not high up near the surface, which is the part of the active layer most affected by run-off. 据此可知，在径流高峰期，大部分土壤还处于结冻期，况且营养物质还处于活土层底部，不是最容易被径流冲刷的活土层表面。也就是说营养物质不在最易被冲刷的区域，对应 B 选项。
答案: B
答案: B
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