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 wouldn’t have needed to carry cattle fat or water to smooth the paths.

　　46.It’s 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

　　47.The underlined part “lubricated the paths” in Paragraph 4 means____.

　　A. made the path wet

　　B. made the path hard

　　C. made the path wide

　　D. made the path slippery

　　48.What does the underlined word “it”in Paragraph 7 refer to?

　　A. Rolling the blocks with poles attached.

　　B. Rolling the blocks on wooden wheels.

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