A study conducted by an Australian science agency has discovered signs that

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问题    A study conducted by an Australian science agency has discovered signs that the country’s ancient Aborigines may have been the world’s first astronomers,【C1】______Stonehenge(巨石阵)in Britain by more than a thousand years.
Professor Ray Norris, of the Commonwealth Scientific and Industrial Research Organization  (CSIRO), said【C2】______knowledge of the stars through songs and stories had been passed down through generations by the Aboriginal people, whose history dates back tens of thousands of years.
"We know there are many stories about the sky: songs, legends, myths to mark out the seasons, so they are very【C3】______Norris said. "People【C4】______changed settlement, so when Pleiades(the Seven Sisters star【C5】______)was up they would move to where the nuts and berries are. Another sign and it would be time to move to the rivers to fish for barramundi, and so on."
Norris, who has studied Aboriginal culture【C6】______and has made several journeys to Arnhem Land in Australia’s Outback, said the research also【C7】______more detailed astronomical thought. "Clearly some thinker in the past has been sitting down in the bush, watching the【C8】______and trying to figure out how it works," he said. "Those thoughts are then encoded in the songs and ceremonies." Norris is now looking for【C9】______that might date the earliest signs of Aboriginal astronomy, such as a stone carving of a meteor strike or comet.    Norris is confident that the Aborigines pre-dated European astronomers, including Stonehenge and Egypt’s great pyramid Giza, both of which are【C10】______at around 3100 BC. "We’ve established there is all this astronomy, what I don’t know is how far back this goes. If it goes back 10,000 or 20,000 years, that makes Aborigines the world’s first astronomers," he said.
A)detailed B)boosted C)eclipse D)vigorous
E)practical F)evidence G)revealed H)estimated
I)regularly J)routine K)cluster L)preceding
M)extensively N)rectifying O)respectively [br] 【C10】

选项

答案 H

解析 around 3100 BC提示空格所在从句补充说明巨石阵和吉萨金字塔的年代，但对于它们的建造年代并没有确切的记录，只能推测，estimated符合句意，与系动词are构成被动语态。

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