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  3. Ten thousand years ago, as the last ice age drew to a close, sea levels around the world were far lower than they are today. Muc

Ten thousand years ago, as the last ice age drew to a close, sea levels around the world were far lower than they are today. Muc

admin2010-01-10  19
问题     Ten thousand years ago, as the last ice age drew to a close, sea levels around the world were far lower than they are today. Much of the land under the North Sea and the English Channel was part of a huge region of forests and grassy plains. Then the climate gradually became warmer and the water trapped in glaciers and ice caps was released. This ancient land was submerged in the resulting deluge and all that remains to tell us that it was once lush and verdant— and inhabited — is the occasional stone tool, harpoon or mammoth tusk brought up from the sea bed by fishing boats.
    Now the development of advanced sonar technology, known as bathymetry, is making it possible to study this flooded landscape in extraordinary detail. While previous devices have only been able to produce two-dimensional images, bathymetry makes use of computers, satellite positioning devices and special software to create accurate and remarkably detailed maps. For the first time an ancient river bed leaps out of the three-dimensional image, complete with rocky ledges rising up from the bottom of the valley. The sites of pre-historic settlements can now be pinpointed, and it is also possible to see in stunning detail the sunken shipwrecks that litter this part of the sea bed.
    According to archaeologist Dr Linda Andrews, this technological development is of huge significance. "We now have the ability to map the sea bed as accurately as we can map dry land," she says. She is, however, scathing about the scale of government funding for such projects. "We have better images of Mars and Venus than of two-thirds of our own planet! In view of the fact that Britain is a maritime nation, and the sea has had such a massive influence on us, it’s an absolute scandal that we know so little about the area just off our shores!"
    Once bathymetric techniques have identified sites where people might have built their homes and villages, divers could be sent down to investigate further. The idea of Britain as a natural island kingdom will be challenged by these findings: Britain has been inhabited for about 500,000 years, and for much of this time it has been linked on and off to continental Europe. It remains to be seen how far this new awareness is taken on board among our "island" people.
    In fact, the use of bathymetry scanners will not be limited to the study of lost landscapes and ancient settlements. It will also be vital in finding shipwrecks. Records show that there are about 44,000 shipwrecks off the shores of Britain, but there is good reason to believe that the real figure is much higher. In addition, commercial applications are a real possibility. Aggregates for the construction industry are becoming increasingly expensive, and bathymetry scanners could be used to identify suitable sites for quarrying this material. However, mapping the sea bed will also identify places where rare plants and shellfish have their homes. Government legislation may prevent digging at such sites, either to extract material for a profit or to make the water deeper: there are plans to dredge parts of the English Channel to provide deeper waterways for massive container ships.  
The author suggests that a better understanding of the ancient settlements on the sea bed may ______.
选项 A、inspire more young people to take up archaeology
B、modify the attitudes of the British to their country’s history
C、provide confirmation about the dangers of global warming
D、alter the perception other countries have about Britain
答案B
解析 这是道细节题。解题句是第四段的“The idea of Britain as a natural island kingdom will be challenged by these findings：Britain has been inhabited for about 500，000 years，and for much of this time it has been linked on and off to continental Europe．”(关于英国是天然岛国的说法将被以下一些新发现置疑。)故选B。B的意思是修正英国人关于自己国家历史的看法。
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