Question

Have you found out the exact reason why the dinosaur _________ many years ago?

A．died down

B．died out

C．died from

D．died of

Answer 1

B

试题分析：句意：你有没有发现许多年前恐龙灭绝的确切原因？died down （火）渐熄，  died out 灭绝，        died from 死于（外因，指伤病，饥饿等） died of 死于（内因，指疾病、过度悲伤等) People are dying of cancer more and more often. 死于癌症的人越来越多了。故选B。
考点: 考查动词短语辨析的用法。