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抯 widely believed that the stone blocks were moved to the pyramid site by ______.i

　　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 搃t攊n Paragraph 7 refer to?th

　　A. Rolling the blocks with poles attached.

　　B. Rolling the blocks on wooden wheels.

　　C. Rolling poles to move the blocks.

　　D. Rolling the blocks with fat.

　　49.Why is rolling better than sliding according to West ?

　　A. Because more force is needed for sliding.

　　B. Because rolling work can be done by fewer cattle.

　　C. Because sliding on smooth road is more dangerous.

　　D. Because less preparation on path is needed for rolling.

　　50.What is the text mainly about ?

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