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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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 of 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
Why was Leacock dubbed as a pro-American British imperialist
A．Because he was a Briton who adored American politics.
B．Because he liked to read American newspapers.
C．Because he lectured on the importance of friendship between U.S. and Britain.
D．Because he chose to live close to Americ
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