What can be inferred from Paragraph 3 concerning
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What can be inferred from Paragraph 3 concerning dinosaurs?
A.They were killed off by an asteroid.
B.They died of drastic climate change.
C.They were wiped off by a volcanic eruption.
D.The cause of their extinction has remained a controversial issue.
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答案：D
由文章第三段倒数第二句话“… because many scientists believe it was primarily caused by the impact of an asteroid.”可知，Wignall没有提6500万年前恐龙的灭绝是否跟火山爆发有关是因为许多科学家认为恐龙的灭绝是由一颗小行星的影响造成的。由此可推断出关于恐龙灭绝的原因在科学家之间是有分歧的。故选D。