单项选择题

Lightning is a ______ of electrical current from a el6ud to the ground or from one cloud to another.

A．rush
B．rainbow
C．race
D．rubber
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单项选择题
The traditional approach ______ with complex problems is to break them down into smaller, more easily managed problems.
A．to dealing
B．in dealing
C．dealing
D．to deal
单项选择题
Writing is a slow process, requiting ______ thought, time, and effort.
A．significant
B．considerable
C．enormous
D．numerous
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