单项选择题

Leacock can be described as all of the following EXCEPT ______.

A．a historian
B．aloof
C．humorous
D．an immigrant
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单项选择题
We can conclude from the passage that ______.
A．there is a consensus about the causes of the end-Permian mass extinction
B．man would not have existed without the end-Permian mass extinction
C．insects are more adaptable in coping with natural devastations
D．natural catastrophes must have hindered the evolution of life
单项选择题
What distinguishes the end-Permian mass extinction from other similar devastations
A．Change of ocean chemistry.
B．Survival of Miocidaris.
C．Causes.
D．Ecological reorganization.
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