7月20日托福閱讀考試真題解析(更新版)
【正文】 s include some territory of Mexico in the plains, but many stop at the Rio Grande. The region is known for supporting extensive ranching and agriculture.GeologyThe Great Plains are the westernmost portion of the vast North American Interior Plains, which extend east to the Appalachian Plateau. The United States Geological Survey divides the Great Plains in the United States into ten physiographic subdivisions:During the Cretaceous Period (14565 million years ago), the Great Plains was covered by a shallow inland sea called the Western Interior Seaway. However, during the Late Cretaceous to the Paleocene (6555 million years ago), the seaway had begun to recede, leaving behind thick marine deposits and a relatively flat terrain where the seaway had once occupied.Paleontological finds in the area have yielded bones of woolly mammoths, saber toothed tigers and other ancient animals, as well as dozens of other megafauna (large animals over 100 lb (45kg)) such as giant sloths, horses, mastodons, and American lion that dominated the area of the ancient Great Planis for million of years. The vast majority of these animals went extinct in North America around 13,000 years ago during the end of the Pleistocene. 第二篇：動物的遷徙 主要講動物如何遷徙，原因不同。先舉了蝴蝶與鯨魚的例子，表明動物靠環(huán)境信號。最開始金星和地球性質(zhì)相似，后來因?yàn)榈厍蜉^太陽更近，溫度高，逐漸蒸發(fā)，造成不同。話題與TPO中Planets in our Solar System 一篇較為對應(yīng)，可作為參考。最后還有一些動物靠磁場導(dǎo)航?！ 〗馕觯罕疚膶儆诘刭|(zhì)學(xué)和農(nóng)業(yè)話題組合，但都是托福閱讀?？荚掝}。本文與TPO中Orientation and Navigation一篇較為對應(yīng)，可作
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