2000.5 阅读38 请问

jy533 · 发表于 2005-4-27 00:54:00

During most of their lives, surge glaciers behave like normal glaciers, traveling perhaps

only a couple of inches per day. However, at intervals of 10 to 100 years, these glaciers

move forward up to 100 times faster than usual. The surge often progresses along a glacier

line like a great wave, proceeding from one section to another. Subglacial streams of meltwater

(5) water pressure under the glacier might lift it off its bed, overcoming the friction between ice

and rock, thus freeing the glacier, which rapidly sliders downhill Surge glaciers also might

be influenced by the climate, volcanic heat, or earthquakes. However, many of these

glaciers exist in the same area as normal glaciers, often almost side by side.

(10) Some 800 years ago, Alaska’s Hubbard Glacier advanced toward the sea, retreated, and

advanced again 500 years later. Since 1895, this secentry-mile-long river of ice has been

flowing steadily toward the Gulf of Alaska at a rate of approximately 200 feet per year. In

June 1986, however, the glacier surged ahead as much as 47 feet a day. Meanwhile, a

western tributary, called Valerie Glacier, advanced up to 112 feet a day. Hubbard’s surge

(15) closed off Russell Fiord with a formidable ice dam, some 2,500 feet wide and up to 800

feet high, whose caged waters threatened the town of Yakutat to the south.

About 20 similar glaciers around the Gulf of Alaska are heading toward the sea. If

enough surge glaciers reach the ocean and raise sea levels, West Antarctic ice shelves could

rise off the seafloor and become adrift. A flood of ice would then surge into the Southern

(20) Sea. With the continued rise in sea level, more ice would plunge into the ocean, causing sea

levels to rise even highter, which in turn would release more ice and set in motion a vicious

cycle. The additional sea ice floating toward the tropics would increase Earth’s albedo and

lower global temperatures, perhaps enough to initiate a new ice age. This situation appears

to have occurred at the end of the last warm interglacial (the time between glacations),

(25) called the Sangamon, when sea ice cooled the ocean dramatically, spawning the beginning

of the Ice Age.

The term “vicious cycle” in lines 21-22 refers

to the

(A) movement pattern of surge glaciers

(B) effect surge glaciers could have on the

temperature of tropical areas

(C) effect that repeated rising sea levels might

have on glacial ice

(D) constant threat surge glaciers could pose to

the Gulf of Alaska

原文说冰山融化和升高海平面成为一个恶性循环但答案选A 不是很理解觉得应选C

[此贴子已经被作者于2005-4-29 10:39:03编辑过]

jy533 · 发表于 2005-4-27 14:01:00

急啊!

jy533 · 发表于 2005-4-27 17:16:00

还有 2000.5 第 4.5 题

4.

According to paragraph 2, which of the

following is true about the small mammals in

the rain forest?

(A) They have body shapes that are adapted to

life in the canopy.

(B) They prefer the temperature and climate of

the canopy to that of other environments.

(C) They have difficulty with the changing

conditions in the canopy.

(D) They use the trees of the canopy for shelter

from heat and cold.

答案选D 可是俺觉得文中明显说了应选C 而且文中有1句话

Thus, in

the trees, where shelter from heat and cold may be scarce and conditions may fluctuate, a

small mammal may have trouble maintaining its body temperature.

jy533 · 发表于 2005-4-27 17:17:00

5.

5. In discussing animal size in paragraph 3, the

author indicates that

(A) small animals require proportionately more

food than larger animals do

(B) a large animal’s size is an advantage in

obtaining food in the canopy

(C) small animals are often attacked by large

animals in the rain forest

(D) small animals and large animals are

equally adept at obtaining food in the

canopy

答案选A 觉得完全不可能啊应该选B 很明显

jy533 · 发表于 2005-4-28 18:39:00

enjoylife517 · 发表于 2005-4-29 02:24:00

建议把文章也贴一下吧，手边没有题目，而且如果有题目其他朋友看起来也方便一些。。

关于阅读，注意把握主题和文章定位。

jy533 · 发表于 2005-4-29 10:40:00

请版主指点 4.5题是答案错了已修改

请指点38题

enjoylife517 · 发表于 2005-4-29 14:33:00

我觉得从字面理解你是对的，但选项C只是表示了这个循环的一个部分，有海水平面对冰川的影响，也应有冰川对海平面的影响，可能A表述了一个完整的概念。所以更合适。

还有再看前面一句话，About 20 similar glaciers around the Gulf of Alaska are heading toward the sea. If

enough surge glaciers reach the ocean and raise sea levels, West Antarctic ice shelves could

rise off the seafloor and become adrift. A flood of ice would then surge into the Southern

(20) Sea. With the continued rise in sea level, more ice would plunge into the ocean, causing sea

levels to rise even highter, which in turn would release more ice and set in motion a vicious

cycle.

还是A比较确切，这个cycle是指的surge glaciers。

请大家讨论

LES · 发表于 2005-4-29 21:28:00

2005.5的３８题偶觉得选C。

C完全focus在的vicious cycle所在句子的意思。

其实这个句子的前半部分就是在描述这个vicious cycle。

bastencool · 发表于 2005-4-30 01:50:00

以下是引用jy533在2005-4-27 0:54:00的发言：