托福词汇怎么背？从题目中理解是最好的方式之一。本托福词汇节选自TOEFL词汇题精选440题，希望对考生们的备考有所帮助。
　　There seem to have been several periods within the last tens of thousands of years when water accumulated in these basins. The rise and fall of the lakes were undoubtedly linked to the advances and retreats of the great ice sheets that covered much of the northern part of the North American continent during those times.
　　The word "accumulated" is closest in meaning to which of following?
　　(A) dried
　　(B) flooded
　　(C) collected
　　(D) evaporated

　　正确答案：C
　　托福词汇：accumulate
　　vt.& vi.堆积，积累
　　vi.(数量)逐渐增加，(质量)渐渐提高
　　第三人称单数:accumulates;过去分词:accumulated;现在分词:accumul...
　　[例句]But you have to speculate to accumulate.但是你不得不通过推测来积累。