单项选择题

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．answerable
B．indefensible
C．pitiable
D．reprehensible
E．avoidable
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单项选择题
Except in times of________, we would scarcely allow public officials to declare states of emergency that replace some normal rules with those more________to extraordinary circumstances.
A．debate … diffident
B．serenity … indifferent
C．catastrophe … germane
D．obedience … ill-suited
E．disaster … hostile
单项选择题
Ancient people felt much________concerning the notion that the appearance of comets was inauspicious, but nevertheless exhibited________concerning the proper reaction to the phenomenon.
A．conviction ... apprehension
B．apathy ... ignorance
C．disparity ... discord
D．consensus ... disagreement
E．suspicion ... hesitancy
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