How did Wignall calculate the killing power of th
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How did Wignall calculate the killing power of those older volcanic eruptions?
A.By estimating how long they lasted.
B.By counting the dinosaurs they killed.
C.By studying the chemical composition of lava.
D.By comparing the proportion of life wiped out with the volume of lava produced.
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答案:D
由文章第二段第四句话“He calculated the ‘ killing efficiency ’ for those… they are produced.”可知,Wignall通过比较火山释放的熔岩的体积与杀死生命的比例计算这些火山的杀伤力。故选D
