托福TPO 9 听力Lecture第2篇第3题_What is one reason for the increase in shrub growth in Arctic Alaska?

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题目

What is one reason for the increase in shrub growth in Arctic Alaska?

Decreases in grass and most growth have altered the balance of nutrients in the soil.

Increases in ground temperature have led to increased microbial activity.

Increases in average winter temperatures have permafrost permeable to water.

Increases in snowfall have provided more water for shrubs.

题目解析

题目对应教授所说：And we've already mentioned the insulating effect of snow. So that extra warmth means even more microbial activity, which means even more food for the shrubs, which means even more shrubs ... 即教授认为大雪对地面有保温效果，所以额外的热度增加了微生物活性，灌木能获取的营养增加了，所以数量越来越多。由此可知 B 选项正确：地面温度上升导致微生物活性上升是灌木加速生长的一个原因。

答案: B

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