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What caused the blackout in July 1977?

A、During a storm, lightning damaged cable.

B、Because of unemployment.

C、Heat waves had made people use too much electrical power.

D、Because the looters damaged the electricity supply.

时间：2022-01-02 18:14 关键词：

答案解析

A
34．答案为A  根据最后一段...when lightning hit and knocked out supply cables可知停电是由于闪电击中了供电电缆。