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
网友回答
A. died down
(答案→)B. died out
C. died from
D. died of
解析：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。