(Para. 7) 3 How did the writer’s family solve the problem of electricity? And how about water?
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(Para. 8) 4 What, in the writer’s view, was one of the greatest benefits of living off the grid?
(Para. 10) 5 What other changes were they trying to make in addition to becoming more economical with power and water usage?
下列不属于保存 PS操作过程的文件类型是？
A. .PDD
B. .PSD
C. .GIF
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