在英语竞赛中，有道题是这样的:There are five books ,T,U,V,W and X,stacked on top of one another on a shelf .Book U is two books below W and immediately on tpo of X.V is three books above U. Which book is on the top of the pile and which is at the bottom?
參考答案:画个图就知道了吗。U在W下2本，而且刚好在X上面。V在U上面3本。所以顺序是VW——UX。所以最上的是V最下的是X
