单项选择题

The author was probably ______.

A．a historian
B．a reporter
C．Leacock's colleague
D．a Navy officer
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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.
单项选择题
Which of the following is TRUE
A．Environmental changes must have caused the end-Permian mass extinction.
B．Massive volcanic eruptions might have caused the end-Permian mass extinction.
C．The disappearance o dinosaurs was a consequence of the end-Permian mass extinction.
D．Marine animals appeared as a result of the end-Permian mass extinction,
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