单项选择题

Charles does not like customers who ______.

A．are very rude
B．keep talking to him when he is busy
C．only buy small things
D．bargain with him too much
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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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