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托福老托精听第四天~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.
One reason_______analyze the_______on the ocean floor is to seehow long-term changes in Earth's temperature have affected the depth of theocean. By analyzing the remains of sea animals in old layers of ocean sediment,oceanographers can determine the depth of the ocean in the past. They'veanalyzed hundreds of such layers, including some from the coldest periods ofEarth's history—the ice ages. What they've found is that during the ice ages,the amount of water in the oceans decreased. Water levels in the ocean droppedby about four hundred feet. Water from the ocean________and became______ in_______,_______,so it didn't______back into the ocean. When temperatures eventually rose again, the glaciersmelted, and the oceans returned to their former depths. Analysis of sedimentarydata indicates that periods of glacial freezing and melting occurred in regularcycles of twenty thousand, forty thousand, and one hundred thousand years.Oceanographers are interested in the history of seawater levels because theyhope to use this historical data in order to predict the possible effect thatglobal warming could have on seawater levels. If industrial_______are capable of heating global temperatures to the point that glaciers begin tomelt, it is urgent for us to know precisely how high sea levels will rise as aresult.
