What is this text mainly about? What is the probable meaning of the word "blackouts" in the second paragraph?

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问题 What is this text mainly about?
What is the probable meaning of the word "blackouts" in the second paragraph?

选项 A、The problem of dim light caused by shortage of power.
B、Excessive use of electric power.
C、A sudden darkness caused by shortage of power supply.
D、Poor quality of electric power.

答案C

解析
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