托福史上最难的一道题目答案解析

2017-02-27 12:27:19来源：网络

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　　为了帮助大家高效备考托福，熟悉托福难题出题思路，新东方在线托福网为大家带来托福史上最难的一道题目答案解析一文，希望对大家托福备考有所帮助。更多精彩尽请关注新东方在线托福网!

　　下面就以托福史上最难的一道题为例，让考生见识ETS的出题谋略和自己目前所处的状态。

　　2016.11.26 The Origin and Rise of Modern Birds

　　(1)Modern birds are classified as Neornithes (“new birds”). (2)Until recently, it was widely accepted that all groups of modern birds in existence today arose during the Cenozoic era (65.5 million years ago through the present), during which they exploded in diversity and number and became geographically widespread to fill the ecological niches vacated by the extinction of the dinosaurs and pterosaurs at the K-T extinction—the mass extinction that occurred around 65 million years ago, at the end of the Cretaceous (145.5—65.5 mya). (3)The study of bird evolution has used the K-T extinction as an important dividing line between older families of birds and their modern counterparts. (4)A scarcity of Mesozoic (250—65 mya) bird fossils has made it difficult to think otherwise because so few clues have been available to directly link Mesozoic and Cenozoic bird families. (5)No one disagrees that modern birds are the descendants of Mesozoic birds, but precisely where those links were made is not yet fully known.

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