单项选择题

When he was ordered from above to expel two________comrades―they insisted on challenging the leadership―he found himself caught between his official duties and his oldest________.

A.dangerous ... enmities
B.obstreperous ... loyalties
C.peerless ... inhibitions
D.dire ... ambitions
E.excellent ... considerations
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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
单项选择题
The primary purpose of the passage is to________.()

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

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