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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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,
单项选择题
The study of the end-Permian mass extinction is hindered by all of the following EXCEPT ______.
A．the lack of experienced researchers
B．lack of access to southern China
C．lack of relevant rock samples
D．lack of well-preserved fossils
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