单项选择题

Many countries are increasing their use of natural gas, wind and other forms of ______.

A．energy
B．source
C．power
D．material
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单项选择题
Although I spoke to him many times, he never took any ______ of what I said.
A．attention
B．notice
C．warning
D．observation
单项选择题
George could not ______ his foolish mistake.
A．account in
B．count on
C．count for
D．account for
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