- [材料题]
请阅读 Passage l ,完成第 21 ~ 25小题。 .
Passage1
No one is sure how the ancient Egyptians built the pyramids near Cairo. But a new study suggests they used a little rock'n'roll. Long-ago builders could have attached wooden poles to the stones and rolled them across the sand,the scientists say. "Technically,l think what they're proposing is possible," physicist Daniel Bonn said. People have long puzzled over how the Egyptians moved such huge rocks. And there's no obvious answer. On average,each of the two million big stones weighed about as much as a large pickup truck.
The Egyptians somehow moved the stone blocks to the pyramid site from about one kilometer away.'rhe most popular view is that Egyptian workers slid the blocks along smooth paths. Many scientists suspect workers first would have put the blocks on sleds. Then they would have dragged them along paths. To make the work easier,workers may have lubricated the paths either with wet clay or with the fat from cattle. Bonn has now tested this idea by building small sleds and dragging heavy objects over sand.
Evidence from the sand supports this idea. Researchers found small amounts of fat,as well as a large amount of stone and the remains of paths.However,physicist Joseph West think there might have been a simpler way,led the new study.West said,"I was inspired while watching a television program showing how sleds might have helped with pyramid. construction. l thought,' Why don't they just try rolling the things?' " A square could be turned into a rough sort of wheel by attaching wooden poles to its sides,he realized. That,he notes, should make a block of stone"a lot easier to roll than a square".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 path.
West hasn't tested his idea on larger blocks,but he thinks rolling has clear advantages over slid-ing. At least,workers wouldn't have needed to carry cattle fat or waLer to smooth the paths.
- 多项选择题1.lt'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
- C
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- 多项选择题2.The underlined part "Iubricated 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
- D
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- 多项选择题3.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.
C、 Rolling poles to move the blocks.
D、 Rolling the blocks with fat.
- A
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- 多项选择题4.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.
- D
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- 多项选择题5.What is che text mainly about?
A、 An experiment on ways of moving blocks to the pyramid site.
B、 An application of the method of moving blocks to the pyramid site.
C、 An argument about different methods of moving blocks to the pyramid site.
D、 An introduction to a possible new way of moving blocks to the pyramid site.
- D
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