While the causes of the Cretaceous-Tertiary extinction have received the most attention, Alvarez’’s paper points out work on the other major mass extinctions that may also be________for the tragedy.

A．explain and resolve a controversy among meteorologists
B．present and describe a recently discovered phenomenon
C．suggest and prove a theory on the cause of a phenomenon
D．describe and confirm research findings under question
E．discuss and evaluate the soundness of certain experimental observations

A．an outgrowth … pervicacious
B．a visitation … rotten
C．a rejection … vitriolic
D．a permutation … heedless
E．a divagation … rapturous