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托福阅读句子简化题：Mass Extinctions

2015-08-18 17:03:15来源：网络

　　【托福阅读题型：Mass Extinctions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：Mass Extinctions

　　【Paragraph 4】American paleontologists David Raup and John Sepkoski, who have studied extinction rates in a　　number of fossil groups, suggest that episodes of increased extinction have recurred periodically, approximately every 26　　million years since the mid-Cretaceous period. The late Cretaceous extinction of the dinosaurs and ammonoids was just　one of the more drastic in a whole series of such recurrent extinction episodes. The possibility that mass extinctions　may recur periodically has given rise to such hypotheses as that of a companion star with a long-period orbit deflecting　other bodies from their normal orbits, making some of them fall to Earth as meteors and causing widespread　devastation upon impact.(Mass Extinctions)

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

　　○Based on their studies of extinction rates of numerous fossil groups, paleontologists David Raup and John　　Sepkoski have determined that mass extinctions occur about every 26 million years.

　　○David Raup and John Sepkoski studied extinction rates of numerous fossil groups and suggest that massextinctions during the Cretaceous period continued for 26 million years.

　　○Studies that paleontologists David Raup and John Sepkoski conducted of various fossil groups have revealedthat extinction rates have increased over the past 26 million years.

　　○The studies conducted by paleontologists David Raup and John Sepkoski of the fossil remains of species　suggest that the extinction rate of species started to increase by the middle of the Cretaceous period.



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