下面就让小编来为大家介绍一下这篇托福听力TPO9学习笔记的相关内容吧，这是小编的一些见解，以便帮助大家更加充分的理解TPO真题，希望能够给正在准备托福听力的考友们带来帮助。
一、难词注解
Precipitation n. [化学] 沉淀，[化学] 沉淀物;冰雹;坠落;鲁莽
Thaw vi. 融解;变暖和vt. 使融解;使变得不拘束n. 解冻;融雪
Impermeable adj. 不渗透性的;(对水等)不能渗透的
Permafrost n. 永久冻土，永久冻地;永久冻结带;永久冰冻
Nutrient n. 营养物;滋养物adj. 营养的;滋养的
insulating effect 绝缘效果
Microbe n. 细菌，微生物
Penetrate vi. 渗透;刺入;看透 vt. 渗透;穿透;洞察
二、长难句分析
Well, it may be biological processes that occur in the soil in the winter,.......These microbes enable the soil to have more nitrogen, which plants need to live and they remain quite active during the winter
难词释义：
Microbe n. 细菌，微生物
难句类型：
强调句+which引导的定语从句
难句拆分：
which+定语从句， 解释前面的 nitrogen
三、考题对应考点
12.So since we're on the topic of global climate change and its effects, in Alaska, ……, and scientists have noticed that there’s been a change in surface vegetation during this time. Shrubs are increasing in the "tundra".开头原则的背景引入式，后续大篇幅在讨论 shrub 的增长，所以答案选择A.
13.one of the reasons that shrubs survive in the Arctic. Shrubs are little bushes. They're not tall and being low in the ground protect them from the cold and wind. And their roots don't grow very deep,因果原则，one of the reasonsone 后面的内容解释原因，是考查的重点，所以选择D。of the reasons So how can increase temperatures in the winter and spring result in increased shrub growth in the summer? Well, it may be biological processes that occur in the soil in the winter,.......These microbes enable the soil to have more nitrogen, which plants need to live and they remain quite active during the winter(C)因果原则，前面提出疑问，后面解答，注意答案是重点，也就是C选项。
14.how can increase temperatures in the winter and spring result in increased shrub growth in the summer? Well, it may be biological processes that occur in the soil in the winter, that cause increased shrub growth in the summer.因果原则，how 后面的问句大家要注意，因为温度升高导致微生物活动性增强，进而植物生长，所以选择B.
15.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.营养物质在土壤深处，不会被风吹走，会被水冲刷走。所以选择B.
16.Well, shrub expansion has occurred in other environments, like semiarid grassland, and tall grass prairies. And shrub expansion in these environments does seem to persist, almost to the point of causing a shift. Once is established, shrub land thrives,女生说 shrubland 会变回 tundra.教授解释说不会，shrub land will thrive once environment established.所以选择A.
17.Professor: Ok, so what's the puzzle? Warmer temperatures should lead to increased vegetation growth, right? 强调原则，提出疑问，那问题在哪儿呢?本来温度高应该使产量上升对吧?教授这么反问就是说实际情况不是这样的，比看起来要更加复杂。所以选择C.
听力文本结构框架：
这个讲座讲的是阿拉斯加灌木丛增长的原因。首先讲的是，由于阿拉斯加温度的不断升高，灌木丛越来越多，越来越大。接着说到营养物质多的地方灌木丛长得越多。最后说到灌木有自己的生长周期，几年间灌木丛会长得很茂密，之后又回到苔原的状态。
以上就是小编的托福听力TPO9学习笔记中关于lecture2的内容，大家在平时备考时也要注意经验和技巧的积累，更多的笔记内容小编稍后为您呈现。最后，小编预祝大家在托福考试中取得好成绩。
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