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TGIF！好开心挖，熬了一周终于是周末了~我是AmyLee，本听力材料来自于老托partb，partc，是公认实施有效的听写材料，对于上手托福时间不长的同学非常适合。我曾经一次短时间备考听力提高了7分也归功老托。希望大家和我一样一定要坚持下来噢。相信坚持学习的同学听力上都会有很大的飞跃！
No pain, no gain.我们的安排是这样的，第一遍用听力软件精听材料（建议做单句听写，听写的时候不要偷看我给的挖空题），然后按照我给的挖空题填关键词，回复后即可看到听力原文和文章精解，我将把难点和易错点one by one 分析给大家。
回复填空答案格式如下：1____2____3____...et.al.
Look at our______map and you'll see that the middle third ofthe North American continent from the Rocky Mountains almost to the Mississippi River is pretty flat. This is the Great Plains.This kind of area is sometimes called a______, sometimes a______. That's s-t-e-p-p-e. The______features are______,______,dry climate, and an absence of trees. The Great Plains are actually the former bed of a shallow inland sea. Over millions of years,______left by______, water, and wind______out the dry sea bed. As I said, the Great Plaints are bordered on the west by the Rocky Mountains. And it's really the Rockies that are responsible for the formation of the grasslands. The mountains are so high that they block the heavy______air traveling eastward form the Pacific Ocean. Lighter, drier air passes overthe mountains. Until people______with irrigation and farms, only grass could grow on the dry,______plain. In fact, we can divide the Great Plains into three zones. In the west, where it's driest and windiest,the grass is very short. In the eastern zone, there's more rain and grass grows as high as 360 centimeters. In the middle third, there's a mix of grass species that grow to an______height.
