下面小编跟大家一起了解托福听力的入门练习分享，希望对大家的学习有所帮助、
　　方式练习，1 做听力填空题，2 做听写练习
　　听力填空练习
　　One reason oceanographers _________ on the ocean floor is to see how ______ changes in Earth's temperature have affected the_______ of the ocean. By analyzing the _____ of sea animals in old______of ocean sediment, oceanographers can determine the depth of the ocean in the past. They've analyzed hundreds of such layers, including some from the coldest periods of Earth's history --- the________.
　　What they've found is that during the ice ages, the amount of water in the oceans _______. Water levels in the ocean dropped by about four hundred feet.Water from the ocean _________ and became frozen in ________, so it didn't _______ back into the ocean.When temperatures eventually rose again, the glaciers _____, and the oceans returned to their former depths. Analysis of _________ that periods of glacial freezing and melting occurred in ________of twenty thousand, forty thousand, and one hundred thousand years.
　　Oceanographers are interested in the history of ______ ，because they hope to use this historical data in order to predict the possible _______ that global warming could have on seawater levels. If_________ are capable of heating global temperatures to the point that glaciers begin to melt, it is urgent for us to know precisely how high sea levels will rise as a result.
　　听力原文
　　One reason oceanographers analyze the sediment on the ocean floor is to see how long-terms changes in Earth's temperature have affected the depth of the ocean.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've analyzed hundreds of such layers, including some from the coldest periods of Earth'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 dropped by about four hundred feet.Water from the ocean evaporated and became frozen in continental glaciers, so it didn't drain back into the ocean.When temperatures eventually rose again, the glaciers melted, and the oceans returned to their former depths.Analysis of sedimentary data indicates that periods of glacial freezing and melting occurred in regular cycles of twenty thousand, forty thousand, and one hundred thousand years.
　　Oceanographers are interested in the history of seawater levels ，because they hope to use this historical data in order to predict the possible effect that global warming could have on seawater levels.If industrial pollutants are capable of heating global temperatures to the point that glaciers begin to melt, it is urgent for us to know precisely how high sea levels will rise as a result.