8.【2015·四川】E
No one is sure how the ancient Egyptians built the pyramids near Cairo. But a new study suggests they used a little rock憂抮oll. Long-ago builders could have attached wooden pole s to the stones and rolled then across the sand, the scientists say.er
揟echnically, I think what they抮e proposing is possible,?physicist Daniel Bonn said.tud
People have long puzzled over how the Egyptians moved such huge rocks. And there抯 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 blocsks to the pyramid site from about one kilometer away.
The 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(滑板). 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 thinks there might have been a simpler way , who led the new study . West said , 揑 was inspired while watching a television program showing how sleds might have helped with pyramid construction . I thought , s‘Why don抰 they just try rolling the things?e’ “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?h
【五年高考(2011-2015)英语试题分项精解:专题23 阅读理解之科普知识类(解析版)】相关文章:
★ 山东省济宁市2016年高考英语复习:条件状语从句(含解析)
★ 2017高考四川省广安市英语阅读理解一轮系列训练:29(含解析)
★ 2017年高考英语二轮复习精品资料:专题16 书面表达(教学案)(教师版)
★ 2017高考四川省广安市英语阅读理解一轮系列训练:19(含解析)
★ 2017高考四川省广安市英语阅读理解一轮系列训练:16(含解析)
★ 2017高考四川省广安市英语阅读理解一轮系列训练:30(含解析)
★ 2017高考四川省广安市英语阅读理解一轮系列训练:28(含解析)
★ 2017届高考英语二轮复习大题冲关秘籍语法填空:考纲解读(含解析)
★ 2017届高考英语二轮复习大题冲关秘籍阅读理解七选五:名校模拟(含解析)
★ 2017高考四川省广安市英语阅读理解一轮系列训练:13(含解析)
最新
2017-04-24
2017-04-24
2017-04-24
2017-04-24
2017-04-21
2017-04-21