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填空题
The idea of a maintenance technician at Burt’s Bees turned out to be helpful and energy-efficient.____

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解析:
根据题干信息“At Burr’s Bees”和“maintenance technician”可以定位到C段“an idea he had for making the firm’s manufacturing procedures more energy-efficient. His ideas proved helpful ...”。故匹配段落为C段。
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