单选题：HowdidWignallcalculatethekillingpowerofthoseoldervolcaniceru

题目分类：卫生类
题目类型：单选题
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题目内容：

HowdidWignallcalculatethekillingpowerofthoseoldervolcaniceruptions? A．Byestimatinghowlongtheylasted.
B．Bycountingthedinosaurstheykilled.
C．Bystudyingthechemicalcompositionoflava.
D．Bycomparingtheproportionoflifewipedoutwiththevolumeoflavaproduced.

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