Older Volcanic Eruptions

50. Older Volcanic Eruptions（綜A）
1) Why did older volcanic eruptions do more damage than more recent ones?
2) How did Wignall calculate the killing power of those older volcanic eruptions?
3) When did dinosaurs become extinct?
4) What can be inferred from paragraph 3 concerning dinosaurs?
5) What is the main thesis of the article?

50. Older Volcanic Eruptions（綜A）
1)Because they killed off life more easily.
2)By comparing the proportion of life wiped out with the volume of lava produced.
3)65 million years ago.
4)The cause of their extinction has remained a controversial issue.
5) Older volcanic eruptions were more destructive.

遠(yuǎn)古火山爆發(fā)

遠(yuǎn)古火山爆發(fā)（綜A）
① 為什么遠(yuǎn)古火山爆發(fā)的破壞（程度）高于（新）火山？
② Wignall如何計(jì)算遠(yuǎn)古火山爆發(fā)的殺傷力的？
③ 恐龍什么時(shí)候滅絕的？
④ 第三段關(guān)于恐龍可以推斷出的是_____________
⑤ 這篇文章的主題是_____________。

遠(yuǎn)古火山爆發(fā)（綜A）
①因?yàn)樗麄兏菀讱缟?br/>②通過對比毀滅的生命的比例與產(chǎn)生的巖漿的量
③6500萬年前
④滅絕的原因仍然是個(gè)有爭議的問題
⑤遠(yuǎn)古火山爆發(fā)更具破壞性