PTE听力练习56-老托93-ocean study

PTE考生目前最大的问题之一就是练习题缺乏。除了有限的基本官方书(PLUS,Testbuilder, OG)之外就没有题了。很多英语基础不是很扎实的同学很难找到练习材料。墨尔本文波雅思PTE培训学校专门为墨尔本,悉尼PTE考生准备了PTE练习的lecture 93篇。各位PTE同学可以练习阅读,练习记笔记技巧,可以练习复述,甚至可以练习describe image。废话少说,下面开始:


One reason oceanographers analyze the sediment on the ocean floor is to see how long-term 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.
【生词摘录】
1. oceanographer: n. [C]海洋学者,海洋研究者
2. sediment: n. [C]沉淀物
3. glacier: n. [C]冰河
4. drain: v. 排出,排水
5. pollutant: n. [C]污染物质

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