50. What does the author imply about the centralized electric grid?
- A. It might become a thing of the past.
- B. It might turn out to be a “prosumer”.
- C. It will be easier to operate and maintain.
- D. It will have to be completely transformed.
答案：A
答案句：What happens to the centralized electric grid, which took decades and billions of dollars to build, as more and more people become “prosumers,” who produce and consume their own energy onsite?
参考译文：随着越来越多的人成为“产消者”，即现场生产和消费自己能源的人，那花了数十年和数十亿美元建造的集中式电网会怎样？
定位线索：题干“centralized electric grid”→答案句取自第7段“centralized electric grid”；文中“prosumers”对应选项A“It might become a thing of the past”（推理出电网可能被替代）。
解析：题干问作者对集中式电网的暗示，答案句以反问形式提出疑问，暗示随着“prosumers”（产消者）增多，集中式电网可能不再必要，推理出选项A“It might become a thing of the past”（可能成为过去式）。选项B“prosumer”是人的概念，电网不可能是产消者，偷换概念；选项C“easier to operate and maintain”文中未提及，无中生有；选项D“completely transformed”程度过重，文中仅暗示可能被替代，未说完全改造。