单选题Between 65,000 and 35,000 years ago,______.A the temperature changed a lotB the earth was much warmer than it is nowC winter isn't colder than summerD most of the ice that melted was in the Northern hemisphere during the 30,000-year long ice age

题目

单选题

Between 65,000 and 35,000 years ago,______.

the temperature changed a lot

the earth was much warmer than it is now

winter isn't colder than summer

most of the ice that melted was in the Northern hemisphere during the 30,000-year long ice age

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相似问题和答案

第1题：

_____ ice cream in the world is more delicious than American ice cream.

A: None

B: Neither

C: Not

D: No

参考答案：D

第2题：

共用题干
1. Icebergs are among nature's most spectacular（壮观的）creations , and yet most people have never seen one.A vague air of mystery envelops them.They come into being somewhere in faraway, frigid waters,amid thunderous noise and splashing turbulence,which in most case no one hears or sees. They exist only a short time and then slowly waste away（消融）just as unnoticed.
2. Objects of sheerest（最纯粹的）beauty they have been called. Appearing in an endless vaniety of shapes,they may be dazzlingly white,or they may be glassy blue,green or purple,tinted faintly on in darker hues.They are graceful, stately,inspiring in calm,sunlight seas.
3.But they are also called frightening and dangerous,and that they are一in the night,in the fog,and in storms.Even in clear weather one is wise to stay a safe distance away from them.Most of their bulk is hidden below the water,so their underwater parts may extend out far beyond the visible top.Also,they may roll over unexpectedly,churning the waters around them.
4.Icebergs are parts of glaciers that break off,drift into the water,float about awhile,and finally melt.Icebergs afloat today are made of snowflakes that have fallen over long ages of time.They embody snows that drifted down hundreds,or many thousands,or in some cases maybe a million years ago.The snows fell in polar region and on cold mountains,where they melted only a little or not at all,and so collected to great depths over the years and centuries.As each year's snow accumulation lay on the surface,evaporation and melting caused the snowflakes slowly to lose their feathery points and become tiny grains of ice.When new snow fell on top of the old,it too turned to icy grains.So blankets of snow and ice grains mounted layer upon layer and were of such great thickness that the weight of the upper layers compressed the lower ones.With time and pressure from above, the many small ice grains joined and changed to larger crystals,and eventually the deeper crystals merged into a solid mass of ice.

With time and pressure from above,the many small ice grains joined and changed to__________, and eventually the deeper crystals merged into a solid mass of ice.
A:larger than the part above the water
B:stay near the iceberg
C:melt away just as unnoticed
D:larger crystals
E:stay away from iceberg
F:above the water

答案：D

解析：

第一段说Icebergs是大自然最壮观的创造，但是…most people have never seen one。A vague air of mystery envelops them.…in most case no one hears or sees.They exist only7 a short time and then siowiy waste away just as unnoticed．以上都说明了冰山的神秘。
第二段讲冰山的美。C项是干扰项。第二段提到了冰山的不同颜色，但描写颜色的目的是为了体现它的美。另外，本段第一句“Objects of sheerest beauty they have been called.”和最后一句“They are graceful , stately , inspiring in calm , sunlight seas.”也都在讲冰山的美丽。
第三段讲冰山是很危险的。第一句就提到：" But they are also called fright-ening and dangerous…”。
第四段讲冰山是如何形成的。
第一段最后一句：" They exist only a short time and then slowly waste away just as unnoticed." waste away和melt away都有“慢慢消融”的意思。
答案相关句在第三段第二句：" Even in clear weather one is wise to stay a safe distance away from them."
答案相关句在第三段第三句：" Most of their bulk is hidden below the water, so their underwater parts may extend out far beyond the visible top."
问题句空格处需要填名词性短语。D项是选项中唯一的名词性短语。另外，从文章的最后一句“With time and pressure from above , the many small ice grains joined and changed to larger crystals , and eventually the deeper crystals merged into a solid mass of ice.”也能找到答案。

第3题：

Climate will warm up over the next 50 to 100 years () it has warmed in the 20,000 years since Ice Age.

A、as long as

B、as soon as

C、as well as

D、as much as

参考答案：D

第4题：

共用题干
New research from NASA scientists suggests emissions of black soot after the way sunlight re- flects off snow.According to a computer simulation,black soot may be responsible for 25 percent of observed global warming over the past century. Soot in the higher latitudes（维度）of the Earth,where ice is more common , absorbs more of the sun's energy and warmth than an icy,white background. Dark-colored black carbon,or soot, absorbs sunlight,while lighter colored ice reflects sunlight.
Soot in areas with snow and ice may play an important role in climate change.Also,if snow and ice covered areas begin melting,the warming effect increase,as the soot becomes more con-centrated on the snow surface.“This provides a positive feedback,as glaciers and ice sheets melt, they tend to get even dirtier.”said Dr. James Hansen,a researcher at NASA's Goddard Institute for Space Studies,New York.
Hansen found soot's effect on snow albedo（反照率）,which may be contributing to trends to-ward early springs in the Northern Hemisphere,such as thinning Arctic sea ice and melting glac-iers permafrost. Soot also is believed to play a role in changes in the atmosphere above the oceans and land.
“Black carbon reduces the amount of energy reflected by snow back into space,thus heating the snow surface more than if there were no black carbon,”Hansen said. Soot's increased absorp-tion of solar energy is especially effective in warming the world's climate.“ This forcing is unusual-ly effective,causing twice as much global warming as a carbon-dioxide forcing of the same magni-tude.”Hansen noted.
Hansen cautioned,although the role of soot in altering global climate is substantial,it does not alter the fact that greenhouse gases are the primary cause of climate warming during the past century .Such gases are expected to be the largest climate forcing for the rest of the century.
The researchers found that observed warming in the Northern Hemisphere was large in the winter and spring at middle and high latitudes. These observations were coherent with the researchers' climate model situations,which showed some of the largest warming effects occurred when there were heavy snow cover and sufficient sunlight.

What is the main cause of climate warming during the past century?
A: Soot.
B: Snow.
C: Greenhouse gases.
D:.Wind.

答案：C

解析：

文章第二段最后一句“…while lighter colored ice reflects sunlight.”说浅色的冰反射太阳光，而黑色的煤烟灰并不反射。其他三项在文章一、二段都有提到，故本题选C。

根据第五段首句“Black carbon reduces the amount of energy reflected by snow back in-to space, thus heating the snow surface more than if there were no black carbon,”可知，黑炭覆盖的地区有更强烈的加热效果。故本题选B。

第五段中的“This forcing”指的是其前面所说的“Soot's increased absorption of solar energy”。因此本题选B。

根据第六段“…it does not alter the fact that greenhouse gases are the primary cause of climate warming during the past century.”可知，温室气体是上世纪气候变暖的首要原因，故选C。

由最后一段最后一句“…which showed some of the largest warming effects occurred when there were heavy snow cover and sufficient sunlight.”知，部分大规模的温室效应发生在有厚雪覆盖层和阳光强烈的地方。故本题选C。

第5题：

If you are like most people,your intelligence varies from season to season．You are probably a lot sharper in the spring than you are at any other time of the year．A noted scientist,Ellsworth Huntington(1876-1947),concluded from other men's work and his own among peoples in different climates that climate and temperature have a definite effect on our mental abilities.
He found that cool weather is much more favorable for creative thinking than is summer heat．This does not mean that all people are less intelligent in the summer than they are during the rest of the year．It does mean,however,that the mental abilities of large numbers of people tend to be lowest in the summer.
Spring appears to be the best period of the year for thinking．One reason may be that in the spring man's mental abilities are affected by the same factors that bring about great changes in all nature.
Fall is the next-best season,then winter．As for summer,it seems to be a good time to take a long vacation from thinking!

It seems that the cold winter__.

A.increases the ability to think
B.is the best time for thinking
C.is better for thinking than is very warm weather
D.decreases the ability to think

答案：C

解析：

参见第二段第一句。

第6题：

The word “day” has two meanings. When we talk about the number of days in a year, we are using “day” to mean 24 hours. But when we talk about day and night, we are using “day” to mean the time between sunrise and sunset. Since the earth looks like a ball, the sun can shine on only half of it at a time. Always one half of the earth is having day and the other half night. A place is moved from day into night and from night into day over and over by the spinning(旋转) of the earth. At the equator(赤道) day and night are sometimes the same length. They are each twelve hours long. The sun rises at 6 in the morning and sets at 6 in the evening. For six months the North Pole is tilted(倾斜) toward the sun. In those months the Northern Hemisphere(半球) gets more hours of sunlight than the Southern Hemisphere. Days are longer than nights. South of the equator nights are longer than days. For the other six months the North Pole is tilted away from the sun. Then the Southern Hemisphere gets more sunlight. Days are longer than night. North of the equator nights are longer than days. Winter is the season of long nights. Summer is the season of long days.

56. When the Western Hemisphere is having day, the Eastern Hemisphere is having ______.

A.both day and night B.day C.neither day nor night D.night

正确答案：D

第7题：

A.several times throughout the year
B.during spring and fall
C.during the summer
D.as seldom as possible

答案：C

解析：

参见最后一段。

第8题：

The inside of the earth is very, very ____. The rock has melted like ice.

A.deep

B.cold

C.hard

D.hot

正确答案：D

第9题：

A.a great effect on everyone's intelligence
B.same effect on most persons'intelligence
C.some effect on a few persons'intelligence
D.no effect on most persons'intelligence

答案：B

解析：

参见第一段最后一句。

第10题：

共用题干
第一篇

Arctic Melt

Earth’s North and South Poles are famous for being cold and icy.Last year,however,the amnount of ice
in the Arctic Ocean（北冰洋）fell to a record low.
Normally,ice builds in Arctic waters around the North Pole each winter and shrinks（缩小）during the
summer. But for many years,the amount of ice left by the end of summer has been declining.
Since 1979,each decade has seen an 11.4 percent drop in end?of-summer ice cover. Between 1981 and
2000,ice in the Arctic lost 22 percent of its thickness,becoming I.13 meters thinner.
Last summer,Arctic sea ice reached its thinnest levels yet.By the end of summer 2007,the ice had
shrunk to cover just 4.2 million square kilometers.That's 38 percent less area than the average cover at that
time of year. And it's a very large 23 percent below the previous record low,which was set just 2 years ago.
This continuing trend has made scientists concerned.
There may be several reasons for the ice melt, says Jinlun Zhang, an oceanographer（海洋学家）at the
University of Washington at Seattle.Unusually strong winds blew through the Arctic last summer. The winds
pushed much of the ice out of the central Arctic,leaving a large area of thin ice and open water.
Scientists also suspect that fewer clouds cover the Arctic now than in the past.Clearer skies allow more
sunlight to reach the ocean.The extra heat warms both the water and the atmosphere.In parts of the Arctic
Ocean last year,surface temperatures were 3.5℃warmer than average and 1.5℃warmer than the previous
record high.
With both air and water getting warmer,the ice is melting from both above and below. In some parts of
the Beaufort Sea,north of Alaska and western Canada,ice that measured 3.3 meters thick at the beginning
of the summer measured just 50 centimeters by season's end.
The new measurements suggest that melting is far more severe than scientists have seen by just looking
at ice covcrfrom above,says Donald K. Perovich,a geophysicist at the U.S.Army Cold Regions Research
and Engineering Laboratory in Hanover,N.H.
Some scientists fear that the Arctic is stuck in a warming trend from which it may never recover.

By the end of summer 2007 the ice cover in the Arctic was ________.
A:4.2 million square kilometers
B:11.4 million square kilometers
C:1.13 million square kilometers
D:38 million square kilometers

答案：A

解析：

build在此处是“增长，扩大”的意思。expand有“扩张”的意思，所以与build含义相符。
根据第四段第二句可知答案。
第五段的最后一句话和第六段的第一、二句话说明了科学家们推测的冰川融化的原因：一为强风，二为较少的云。
短文第七段举例说明在一个夏天冰层可以以令人难以置信的速度巡逗融化。
短文最后一句提到，一些科学家担心北极已经陷人可能永远无法恢复的变暖趋势之中。第二篇本文主要讲述了两个失聪的青少年之间的故事。

单选题Between 65,000 and 35,000 years ago,______.A the temperature changed a lotB the earth was much warmer than it is nowC winter isn't colder than summerD most of the ice that melted was in the Northern hemisphere during the 30,000-year long ice age

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