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托福阅读句子简化题：Extinction of the　Dinosaurs

2015-08-17 15:37:06来源：网络

　　【托福阅读题型：Extinction of the　Dinosaurs句子简化题】托福阅读中句子简化题是重要题型之一。根据托福阅读题型不同来进行专项练习，是短期提高托福阅读能力的有效方法。同学们需要多加练习哦!

　　查看全部：托福阅读题型分类练习之句子简化题

　　托福阅读句子简化题：Extinction of the　Dinosaurs

　　【Paragraph 4】Dissatisfaction with conventional explanations for dinosaur extinctions led to a surprising　observation that, in turn, has suggested a new hypothesis. Many plants and animals disappear abruptly from the fossil　record as one moves from layers of rock documenting the end of the Cretaceous up into rocks representing the　beginning of the Cenozoic (the era after the Mesozoi○. Between the last layer of Cretaceous rock and the first layer of　Cenozoic rock, there is often a thin layer of clay. Scientists felt that they could get an idea of how long the extinctions　took by determining how long it took to deposit this one centimeter of clay and they thought they could determine the　time it took to deposit the clay by determining the amount of the element iridium (lr) it contained.(Extinction of the　Dinosaurs)

　　Which of the sentences below best expresses the essential information in the highlighted sentence in the　passage? In correct choices change the meaning in important ways or leave out essential information.

　　○The fossil record suggests that there was an abrupt extinction of many plants and animals at the end of the　Mesozoic era.

　　○Few fossils of the Mesozoic era have survived in the rocks that mark the end of the Cretaceous.

　　○Fossils from the Cretaceous period of the Mesozoic up to the beginning of the Cenozoic era have been　removed from the layers of rock that surrounded them.

　　○Plants and animals from the Mesozoic era were unable to survive in the Cenozoic era.



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