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2016-03-29 14:45:29来源：新东方在线整理

　　It was not until the Cambrian period, beginning about 600 million yearsago, that a great proliferation of macroscopic species occurred on Earth andproduced a fossil record that allows us to track the rise and fall ofbiodiversity. Since the Cambrian period, biodiversity has generally risen, butthere have been some notable exceptions. Biodiversity collapsed dramaticallyduring at least five periods because of mass extinctions around the globe. Thefive major mass extinctions receive most of the attention, but they are onlyone end of a spectrum of extinction events. Collectively, more species wentextinct during smaller events that were less dramatic but more frequent. Thebest known of the five major extinction events, the one that saw the demise ofthe dinosaurs, is the Cretaceous-Tertiary extinction.

　　2. Paragraph 1 supports which of the following statements about life onEarth before the Cambrian period?

　　○Biodiversity levels were steady, asindicated by the fossil record.

　　○Levels of biodiversity could not betracked.

　　○The most dramatic extinction episodeoccurred.

　　○Few microscopic species existed.

　　✔解析：

　　• 题干关键词：before the Cambrian period?

　　• 文中定位点：It was not until the Cambrian period, beginning about 600 million years ago, that a great proliferation ofmacroscopic species occurred on Earth and produced a fossil record that allowsus to track the rise and fall of biodiversity.

　　• 利用反义推理：It was not until the Cambrian period……allows us to track the riseand fall of biodiversity→Levels of biodiversity could not betracked.

　　☞所以选B

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