六级练习2015.05.27
[audio]http://sound.yywz123.com/tingbbs/cet6/cet620150527.mp3[/audio]Man's first real inventionand one of the most important inventions in history, was the wheel All transportation and (1)__________________. The wheel is the simplest yet perhaps the most remarkable of all invention. Because there are no wheels in nature--no living things was ever created with wheel How,then,did man come to invent the wheel? Perhaps some early hunters found that they could (2)______________more easily than they could carry it. However,the logs themselves weighed a lost. It must have taken a great prehistoric thinker to imagine two thin slices on log connected at their centers by a strong stick. This would roll along just as the logs did yet be much lighter and easier to handle. Thus the (3)____________________.
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