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 are common elsewhere，Antarctica makes possible scientific measurements that are often sharper and easier to interpret than those made in other parts of the world.
Therefore，growing numbers of scientists see Antarctica as a distant-early-warning 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 whole world 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 （高原） covered by an ice sheet nearly two miles thick."West" of the mountain，the half of the continent south of the Americas is also covered by an ice sheet，but there the ice rests on rock that is mostly well below sea level.If the West Antarctic Ice Sheet disappeared，the western part of the continent would be reduced to a few and far gathering of island.
While ice and snow are obviously central to many environmental experiments，others focus on the mysterious "dry valley" of Antarctica.The valleys contain little ice or snow even in the depths of winter.Through the mountains of southern Victoria Land，these valleys once held enormous glaciers that extended 9.000 feet downside to the Ross Sea.Now the glaciers are gone，perhaps due to the global warming trend during the 10，000 years since the ice age.Even the snow that falls in the dry valleys is blown away by strong winds that roars down from the polar plateau to the sea.
Despite the mysterious aspect of the dry valleys.jye.ai scientists believe they may carry the hope of the environment.Some scientists believe that in some cases the dry valleys may absorb pollutants faster than pollutants enter them.
（1）What is the best title for this passage？ AA
A．Antarctica and environmental Problems.
B．Antarctica：a high plateau.
C．Antarctica：a Unique Observation Post.
D．Antarctica：a Mysterious Place.
（2）What would the result be if the West Antarctic Ice Sheet disappeared？ DD
A．The western part of the continent would be disappeared.
B．The western part of the continent would be reduced.
C．The western part of the continent would become a fragmentary island.
D．The western part of the continent would be reduced to a gathering of island.
（3）Why are the Dry Valleys left bare？ CC
A．Strong wind blows the snow away.
B．It rarely snows.
C．Because of the global warming trend and fierce wind.
D．Ice sheets.
（4）Which of the following is true？ CC
A．The "Dry Valleys" have nothing left inside.
B．The"Dry Valleys" never held glaciers.
C．The"Dry Valleys" may carry a message of hope.
D．The "Dry Valleys" are useless to scientists.
【答案】A；D；C；C
【解答】
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發(fā)布：2024/5/27 14:0:0組卷：2引用：1難度：0.5
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D．It suggests that the local people are well educated.發(fā)布：2025/1/6 16:30:6組卷：0引用：1難度：0.5