单项选择题

Some minerals are quite common, others are regionally _________, and still others are rare on the earth.

A．attributed
B．distributed
C．contributed
D．scattered
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单项选择题
It was believed that his death _________ with the robbery of the bank downtown.
A．accompanied
B．coincided
C．correlated
D．conformed
单项选择题
As one of the youngest professors in the university, Miss King is certainly on the _________ of a brilliant career.
A．end
B．edge
C．threshold
D．course
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