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概括大意與完成句子

Volcanoes were more destructive in ancient history. Not because they were bigger, but because the carbon dioxide they released wiped out life with greater ease. 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.

Older eruptions were more devastating _____________.

 A、than more recent ones

 B、the killing efficiency for older eruptions

 C、has been known to us all

 D、Wignalls calculations as acceptable

【正確答案】 A

【答案解析】 僅從語(yǔ)法的角度講就可以判斷選擇A。more devastating用了比較級(jí)，通常比較級(jí)是有比較對(duì)象的，而比較對(duì)象由than連接，另外A選項(xiàng)填入空后與本段文字的第一句話(huà)表達(dá)相同的意思，因此選擇A。

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