gmat 逻辑至尊难题6

Energy

The reason much refrigerated food spoils is that it ends up out of sight at the back of the shelf. So why not have round shelves that rotate? Because such rotating shelves would have just the same sort of drawback, since things would fall off the shelves’ edges into the rear corners.
Which of the following is presupposed in the argument against introducing rotating shelves?
(A) Refrigerators would not be made so that their interior space is cylindrical.
(B) Refrigerators would not be made to have a window in front for easy viewing of their contents without opening the door.
(C) The problem of spoilage of refrigerated food is not amenable to any solution based on design changes.
(D) Refrigerators are so well designed that there are bound to be drawbacks to any design change.
(E) Rotating shelves would be designed to rotate only while the refrigerator door was open.
THE KEY IS A,WHAT IS THE LINE OF REASONING?

番茄炒蛋

因为中间的盘子have round shelves that rotate
如果冰箱是方的，那么自然会有空隙咯
那么为什么things would fall off the shelves’ edges into the rear corners.
当然是因为冰箱里面是方的咯
如果是园的又怎么会有孔隙呢？
这就是原文假设的一个前提

dabendan12

本题是说Food spoil 是因为food在后面看不见. 又自问为什么不用转盘呢?又自答是因为转盘的东西回fail down.
试想如果Frig内部是圆的同转盘正合适,就不应该fail down. 所以这个assumption就是frig的内部不是圆的.