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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 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 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 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 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 roars down from the polar plateau to the sea. Left bare are spectacular gorges, 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 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?
Antarctica and environmental Problems.
Antarctica: Earth s Early-Warning station.
Antarctica: a Unique Observation Post.
Antarctica: a Mysterious Place.
2. What would the result be if the West Antarctic Ice Sheet disappeared?
The western part of the continent would be disappeared.
The western part of the continent would be reduced.
The western part of the continent would become scattered Islands.
The western part of the continent would be reduced to a cluster of Islands.
3. Why are the Dry Valleys left bare?
Vicious wind blasts the snow away.
It rarely snows.
Because of the global warming trend and fierce wind.
Sand dunes.
4. Which of the following is true?
The Dry Valleys have nothing left inside.
The Dry Valleys never held glaciers.
The Dry Valleys may carry a message of hope for the verdant.
The Dry Valleys are useless to scientists.
Vocabulary
1. distant-early-warning sensor 远距离早期报警传感器
2. plateau 高原,高地
3. slash 挥砍
4. blast 一阵疾风/狂风
5. vicious 邪恶的,凶魔般的
6. gorge 峡谷
7. ripple 起伏,使起微波
8. sand dune 沙丘
9. verdant 绿色
10. extraterrestrial 地球之外的
11. aura 气氛
参考答案:
1. A 2. D 3. C 4. C
牛津实用英语语法 53 another,other,others与one和some连用
牛津实用英语语法 21各种表示比较的句子结构
牛津实用英语语法 20形容词的比较等级
牛津实用英语语法 79指人的非限定性关系从句
牛津实用英语语法 27 形容词+动词不定式/that从句/介词结构
牛津实用英语语法 31 比较级与最高级
牛津实用英语语法 30 词形相同的副词与形容词
牛津实用英语语法 41 程度副词
牛津实用英语语法 72限定性关系从句
牛津实用英语语法 49 neither,either
牛津实用英语语法 43 quite
牛津实用英语语法 69 neither/either,someone/everyone/no o
表示推测的用法
牛津实用英语语法 形容词作定语和表语时的位置
牛津实用英语语法 61 ever位于who,what,where,why,when,how
比较can 和be able to
牛津实用英语语法 46 all,each,every,everyone,everybody,e
牛津实用英语语法 this/these,that/those(指示形容词和指示
牛津实用英语语法 52 else位于someone/anybody/nothing等之后
牛津实用英语语法 48 all/both/each+of和其他可以替代的结构
牛津实用英语语法 名词的复数形式
牛津实用英语语法 57 who,whom,which和what作介词宾语
牛津实用英语语法 29 由ly构成的副词
牛津实用英语语法 36 地点副词
情态动词+ have +过去分词
牛津实用英语语法 42 fairly和rather
牛津实用英语语法 38 频度副词
牛津实用英语语法 a/an的省略
牛津实用英语语法 名词的所有格形式
牛津实用英语语法 37 时间副词
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