1、公共英語(yǔ)一級(jí)備考試題含答案Antarctica and EnvironmentAntarctica has actually become a kind of space station - a unique observation post for detecting important changes in the worlds environment. Remote from major sources of pollution and the complex geological and ecological systems that prevail elsewhere， Antarc

2、tica 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 u

3、p 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 s

4、hare.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 continen

5、t 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 sparse cluster of island.While ice and snow are obviously central to many

6、 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 descended 9，000 feet from the polar pla

7、teau 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 roars down from the polar plateau to the sea. Left bare are spectacular gorges，

8、rippled fields of sand dunes， clusters of boulders 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 they may carry a message of hope of the verdant parts of the earth. Some

9、scientists believe that in some cases the dry valleys may soak up pollutants faster than pollutants enter them.1. What is the best title for this passage?AAntarctica and environmental Problems.BAntarctica： Earths Early-Warning station.CAntarctica： a Unique Observation Post.DAntarctica： a Mysterious

10、Place.2. What would the result be if the West Antarctic Ice Sheet disappeared?AThe western part of the continent would be disappeared.BThe western part of the continent would be reduced.CThe western part of the continent would become scattered Islands.DThe western part of the continent would be redu

11、ced to a cluster of Islands.3. Why are the Dry Valleys left bare?AVicious wind blasts the snow away.BIt rarely snows.CBecause of the global warming trend and fierce wind.DSand dunes.4. Which of the following is true?AThe “Dry Valleys” have nothing left inside.BThe “Dry Valleys” never held glaciers.C

12、The “Dry Valleys” may carry a message of hope for the verdant.DThe “Dry Valleys” are useless to scientists.Vocabulary1. distant-early-warning sensor 遠(yuǎn)距離早期報(bào)警傳感器2. plateau 高原，高地3. slash 揮砍4. blast 一陣疾風(fēng)/狂風(fēng)5. vicious 邪惡的，兇魔般的6. gorge 峽谷7. ripple 起伏，使起微波8. sand dune 沙丘9. verdant 綠色10. extraterrestrial 地球

13、之外的11. aura 氣氛難句譯注1. Growing numbers of scientists therefore see Antarctica as a distant-early waning sensor， where potentially dangerous global trends may be spotted before they show up to the north.結(jié)構(gòu)簡(jiǎn)析see as 把看作。Where定從修飾Antarctic答案詳解1. A 南極洲和環(huán)境問(wèn)題。B. 南極洲：地球最早的報(bào)警戰(zhàn)。C.南極洲：獨(dú)一無(wú)二的觀察哨。D. 南極洲：神秘的地方。三項(xiàng)都是總

14、內(nèi)容眾的組成部分。2. D 大陸西部成為一群島嶼。第三段“橫斷南極的山脈，有的高達(dá)一萬(wàn)四千多英尺，把這大陸分成情況各異的兩個(gè)地區(qū)。山脈以東的大陸部分是由差不多兩英里厚的冰層覆蓋的高原;山脈以西，即美洲以南的半個(gè)大陸也為冰層所覆蓋。可是，這里冰層覆蓋在大大低于海平面的巖石。如果西南極洲冰層消失，那這大陸西部將成為稀疏的島群?！盇. 大陸西部將小時(shí)。B. 大陸西部縮小。D. 大陸西部將成為分散的島嶼。3. C 因?yàn)榈厍蜃兣涂耧L(fēng)勁吹。在第四段：“這些干谷甚至在寒冬季節(jié)也很少有冰雪。它們插在南維多利亞陸地的山脈中，一度曾有從極地高原到羅斯海的深度為9000英尺的冰河?，F(xiàn)在冰河已不存在，很可能是冰期之后一萬(wàn)年間地球變暖的結(jié)果。即使落入干谷的雪也被從極地高原咆哮入海的邪惡狂風(fēng)