So he tried it．

　　He and his students tied some poles to each of four sides of a 30－kilogram stone block.That action turned the block into somewhat a wheel.Then they placed the block on the ground.

　　They wrapped one end of a rope around the block and pulled.The researchers found they could easily roll the block along different kinds of paths.They calculated that rolling the block required about as much force as moving it along a slippery(滑的)path.

　　West hasn’t tested his idea on larger blocks，but he thinks rolling has clear advantages over sliding.At least，workers wouldnt have needed to carry cattle fat or water to smooth the paths.

　　【语篇导读】　本文主要讲述的是关于金字塔的建造，不同的专家有着不同的见解。这篇文章主要讲述了两种看法。

　　1．Its widely believed that the stone blocks were moved to the pyramid site by ________．

　　A．rolling them on roads

　　B．pushing them over the sand

　　C．sliding them on smooth paths

　　D．dragging them on some poles

　　答案　C　[细节理解题。根据文章第四段的

　　The most popular view is that Egyptian workers slid the blocks along smooth paths，可知选择C。]

　　2．The underlined part “lubricated the paths” in Paragraph 4 means________．

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