The multiplication tables(乘法口诀表) are an exception to the general rule that we forget rather quickly the things that we learn in school, because they are another of the things we overlearn in childhood.

　　The law of overlearning explains why cramming(突击学习)for an examination, though it may result in a passing grade, is not a satisfactory way to learn a college course. By cramming, a student may learn the subject well enough to get by on the examination, but he is likely soon to forget almost everything he learned. A little overlearning, on the other hand, is really necessary for one's future development.

　　（2017全国卷Ⅰ，D）

　　68.The author explains the law of over learning by_________.

　　A. presenting research findings

　　B. setting down general rules

　　C. making a comparison

　　D. using examples

　　【答案】68. D

　　【解析】

　　【例】The need to feed a growing population is putting much pressure on the world’s supply of water.With 97% of the world’s water too salty to be drunk or used in agriculture，the worldwide supply of water needs careful management，especially in agriculture.Although the idea of a water shortage(短缺) seems strange to someone fortunate enough to live in a high rainfall country，many of the world’s agriculture industries experience constant water shortages.Although dams can be built to store water for agricultural use in dry areas and dry seasons，the costs of water redistribution(重新分配) are very high.Not only is there the cost of the engineering itself，but there is also an environmental cost to be considered.Where valleys(山谷) are flooded to create dams，houses are lost and wildlife homes destroyed.Besides，water may flow easily through pipes to fields，but it cannot be transported from one side of the world to the other.Each country must therefore rely on the management of its own water to supply its farming requirements.

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