首页
登录
职称英语
Antarctica has actually become a kind of space station—a unique observation
Antarctica has actually become a kind of space station—a unique observation
游客
2023-08-01
17
管理
问题
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 distant-early-warning sensor, where potentially dangerous global trends may be spotted before they show up to the north. One premising 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 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 lee Sheet disappeared, the western part of the continent would be reduced to a sparse cluster of island.
While ice and snow are obviously central to many environmental experiments, others focus on the mysterious "dry valley" of Antarctica, valleys that contain little ice or snow even in the depths of winter. Slashed through the mountains of southern Victoria land, these valleys once held enormous glaciers that descend 9,000 feet from the polar plateau to the Ross Sea. Now the glaciers are gone, perhaps a casualty of the global warming trend during the 10,000 years since the ice age. Even the snow that falls in the dry valleys is blasted out by vicious winds that roar down from the polar plateau to the sea. Left bare are spectacular gorges, rippled fields of sand dunes, clusters of boulders(大圆石) sculptured into fantastic shapes by 100-mile-an-hour winds, and an aura of extraterrestrial desolation.
Despite the unearthly aspect of the dry valleys, some scientists believe that they may carry a message of hope for the verdant(草木繁茂的)parts of the earth. Some scientists believe that in some cases the dry valleys may soak up pollutants faster than pollutants enter them.
选项
A、it is a space station
B、it is an ideal place for the investigation of glaciology
C、there is the mysterious dry valley
D、it can help people detect global environmental changes
答案
D
解析
细节题。见文章中第一句“…a unique observation post for detecting important changes in the world’s environment”。从此句可知南极洲是唯一一个观测全球环境发生重大变化的一个点。因而选项D是正确的。
转载请注明原文地址:https://tihaiku.com/zcyy/2888711.html
相关试题推荐
[originaltext]Longbeforetheycanactuallyspeak,babiespayspecialatten
[originaltext]Longbeforetheycanactuallyspeak,babiespayspecialatten
Theuniquehumanhabitoftakinginandemployinganimals—evencompetitorsl
Theuniquehumanhabitoftakinginandemployinganimals—evencompetitorsl
Antarctica’svast,frozen,barrenlandscapehasbeckonedscholarsand【C1】___
Antarctica’svast,frozen,barrenlandscapehasbeckonedscholarsand【C1】___
Antarctica’svast,frozen,barrenlandscapehasbeckonedscholarsand【C1】___
Antarctica’svast,frozen,barrenlandscapehasbeckonedscholarsand【C1】___
Antarctica’svast,frozen,barrenlandscapehasbeckonedscholarsand【C1】___
[originaltext]It’sbecomepartoftherestauranttablesetting:knife,fork
随机试题
Chinahasoutlinedanewapproachtoforeigninvestment,withplannerssayin
Ⅰ型变态反应中,特异性IgE抗体吸附在A.浆细胞嗜碱细胞 B.浆细胞嗜酸细胞
以下是影响食用油酸败程度的因素,除了A.油脂中水分的多少 B.是否密封保存
降低高土壤电阻率地区接地电阻的措施有( )。A.加降阻剂 B.增加接地极的数
水液可使指甲染黄的药材是A.牛黄 B.熊胆 C.蟾酥 D.蛤蟆油 E.麝
下列关于保险与保证的说法不正确的是()。A:保险依约赔偿损失或给付保险金是履行自
小王从甲公司跳槽到乙公司,年工资总额增长25%,?乙公司的工资总额包括现金部分和
可保风险的条件约束主要表现在()。 A.风险损失具有不可测性 B.风险
集体谈判模型中,()通常低于竞争工资率以下的某一点。A.工会的坚持点 B
在借贷记账法下,账户的借方登记包括()。A.收入的增加额. B.费用的减
最新回复
(
0
)