单选题：How did Wignall calculate the killing power of those older v

题目分类：卫生类
题目类型：单选题
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题目内容：

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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分类：卫生类题型：单选题

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分类：卫生类题型：单选题