自考英语

Paul Wignall from the University of Leeds was investigating the link between volcanic eruptions and mass extinctions. Not all volcanic eruptions killed off large numbers of animals,but all the mass extinctions over the past 300 million years coincided with huge formations of volcanic rock. To his surprise,the older the massive volcanic eruptions were,the more damage they seemed to do.

The main idea of this paragraph is__________.

A.Association of Mass Extinctions with Volcanic Eruptions

B.Killing Power of Ancient Volcanic Eruptopms

C.A Mass Extinctions

D.Volcanic Eruptions That Caused No Mass Extinction

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