选修八 Module 1 Deep South
Antarctica has actually become a kind of space station—a unique observation post for detecting important changes in the world's environment. Remote from major sources of pollution and the complex geological and ecological systems that prevail elsewhere, Antarctica makes possible scientific measurements that are often sharper and easier to interpret than those made in other parts of the world.
Growing numbers of scientists therefore see Antarctica as a distantearlywarning sensor, where potentially dangerous global trends may be spotted before they show up to the north. One promising field of investigation is glaciology. Scholars from the United States, Switzerland, and France are pursuing seven separate but related projects that reflect their concern for the health of the West Antarctic Ice Sheet—a concern they believe the world at large should share.
The Transantarctic Mountain, some of them more than 14, 000 feet high, divide the continent into two very different regions. The part of the continent to the east of the mountains is a high plateau covered by an ice sheet nearly two miles thick. West of the mountain, the half of the continent south of America is also covered by an ice sheet, but there the ice rests on rock that is mostly well below sea level.
1.教材原句:
Not_until the late 18th century did the British explorer James Cook...
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