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本帖最后由 MIUseliza 于 2015-8-4 13:22 编辑
Climatic conditions are delicately adjusted to the composition of the Earth's atmosphere. If there were a change in the atmosphere—for example, in the relative proportions of atmospheric gases—the climate would probably change also. A slight increase in water vapor, for instance, would increase the heat-retaining capacity of the atmosphere and would lead to a rise in global temperatures. In contrast, a large increase in water vapor would increase the thickness and extent of the cloud layer, reducing the amount of solar energy reaching the Earth's surface.
climatic conditions-->earth atmosphere composition
The level of carbon dioxide, CO2, in the atmosphere has an important effect on climatic change. Most of the Earth's incoming energy is short-wavelength radiation, which tends to pass through atmospheric CO2 easily. The Earth, however, reradiates much of the received energy as long-wavelength radiation, which CO2 absorbs and then remits toward the Earth. This phenomenon, known as the greenhouse effect, can result in an increase in the surface temperature of a planet. An extreme example of the effect is shown by Venus, a planet covered by heavy clouds composed mostly of CO2,whose surface temperatures have been measured at 430℃. If the CO2 content of the atmosphere is reduced, the temperature falls. According to one respectable theory, if the atmospheric CO2 concentration were halved, the Earth would become completely covered with ice. Another equally respectable theory, however, states that a halving of respectable theory, however, states that a halving of the CO2 concentration would lead only to a reduction in global temperatures of 3℃.
CO2 important effect
如何造成温室效应以及CO2对温度的影响
If, because of an increase in forest fires or volcanic activity, the CO2, content of the atmosphere increased, a warmer climate would be produced. Plant growth, which relies on both the warmth and the availability of CO2, would probably increase. As a consequence, plants would use more and more CO2. Eventually CO2 levels would diminish and the climate, in turn, would diminish and the climate, in turn, would become cooler. With reduced temperatures many plants would die; CO2 would thereby be returned to the atmosphere and gradually the temperature would rise again. Thus, if this process occurred, there might be a long-term oscillation in the amount of CO2, present in the atmosphere, with regular temperature increases and decreases of a set magnitude.
举例说明CO2增加减少造成的东西
Some climatologists argue that the burning of fossil fuels has raised the level of CO2, in the atmosphere and has caused a global temperature increase of at least 1℃. But a supposed global temperature rise of 1℃ may in reality be only several regional temperature increases, restricted to areas where there are many meteorological stations and caused simply by shifts in the pattern of atmospheric circulation. Other areas, for example the Southern Hemisphere oceanic zone, may be experiencing an equivalent temperature decrease that is unrecognized because of the shortage of meteorological recording stations.
fossil和co2的关系,以及测量各地温度
1. The passage supplies information for answering which of the following questions?
A Why are projections of the effects of changes in water vapor levels on the climate so inaccurate?
B What are the steps in the process that takes place as CO2 absorbs long-wavelength radiation?
C How might out understanding of the green-house effect be improved if the burning of fossil fuels were decreased?
D What might cause a series of regular increases and decreases in the amount of CO2 in the atmosphere?
E Why are there fewer meteorological recording stations in the Southern Hemisphere oceanic zone than elsewhere?
定位:If, because of an increase in forest fires or volcanic activity, the CO2, content of the atmosphere increased, a warmer climate would be produced. Plant growth, which relies on both the warmth and the availability of CO2, would probably increase. As a consequence, plants would use more and more CO2. Eventually CO2 levels would diminish and the climate, in turn, would diminish and the climate, in turn, would become cooler. With reduced temperatures many plants would die; CO2 would thereby be returned to the atmosphere and gradually the temperature would rise again. Thus, if this process occurred, there might be a long-term oscillation in the amount of CO2, present in the atmosphere, with regular temperature increases and decreases of a set magnitude.
2. The author is primarily concerned with
A explaining the effects that the burning of fossil fuels might have on climate.只有最后一段提到
B illustrating the effects of CO2 on atmospheric radiation第二段only
C discussing effects that changes in the CO2 level in the atmosphere might have on climate
D challenging hypotheses about the effects of water vapor and CO2 on climate第一段
E refuting hypotheses(无) by climatologists about the causes of global temperature fluctuations
主要在讨论CO2
3. The passage suggests that a large decrease in the amount of CO2 in the atmosphere would result in
A at least a slight decrease in global temperatures
B at the most a slight increase in short-wavelength radiation reaching the Earth
C a slight long-term increase in global temperatures
D a large long-term increase in the amount of volcanic activity
E a slight short-term increase in atmospheric water vapor content
定位:If, because of an increase in forest fires or volcanic activity, the CO2, content of the atmosphere increased, a warmer climate would be produced. Plant growth, which relies on both the warmth and the availability of CO2, would probably increase. As a consequence, plants would use more and more CO2. Eventually CO2 levels would diminish and the climate, in turn, would diminish and the climate, in turn, would become cooler. With reduced temperatures many plants would die; CO2 would thereby be returned to the atmosphere and gradually the temperature would rise again. Thus, if this process occurred, there might be a long-term oscillation in the amount of CO2, present in the atmosphere, with regular temperature increases and decreases of a set magnitude.
4. The author refers to Venus primarily in order to
A show the inherent weakness of the green-house effect theory
B show that the greenhouse effect works on other planets but not on Earth
C show the extent to which Earth's atmosphere differs from that of Venus
D support the contention that as water vapor increases, the amount of CO2 increases
E support the argument that the CO2 level in the atmosphere has a significant effect on climate
定位:The Earth, however, reradiates much of the received energy as long-wavelength radiation, which CO2 absorbs and then remits toward the Earth. This phenomenon, known as the greenhouse effect, can result in an increase in the surface temperature of a planet. An extreme example of the effect is shown by Venus, a planet covered by heavy clouds composed mostly of CO2,whose surface temperatures have been measured at 430℃.
5.The passage suggests that if there were a slight global warming at the present time, it would be
A easy to measure the exact increase in temperature because of the abundance of temperature recording stations throughout the world
B difficult to measure the increase of CO2 in the atmosphere because of local variations in amounts
C easy to demonstrate the effects of the warming on the water vapor in the atmosphere
D difficult to prove that the warming was caused by the burning of fossil fuels
E easy to prove that the warming was caused by an increase of cloud cover
定位:Some climatologists argue that the burning of fossil fuels has raised the level of CO2, in the atmosphere and has caused a global temperature increase of at least 1℃. But a supposed global temperature rise of 1℃ may in reality be only several regional temperature increases, restricted to areas where there are many meteorological stations and caused simply by shifts in the pattern of atmospheric circulation. Other areas, for example the Southern Hemisphere oceanic zone, may be experiencing an equivalent temperature decrease that is unrecognized because of the shortage of meteorological recording stations.
global temperature rise=global warming
A measure the exact increase in temp--> abundance of 记录仪:文中最后提到shortage of meteorological recording stations.
B 不好测量,因为有地区co2差异:文中说的是温差,并不是co2差
C demonstrate-->大气中的vapor:完全没提
D 不好证明是否是fossil fuel引起的:文中第一句argue burning of fossil fuels 是提高了co2 level,然后引起了全球温度上升了1度。But接着前面的一句说明取反,整段后面应该就是说不是fossil fuel引起的。后面接着说有可能是因为only several regional temperature increases有很多可以测量温度的地方,而且引起温度上升的原因的shift in the pattern of atmospheric circulation.其他地方可能还会有气温下降,但是并不能认清楚,由于没有温度测量。整段说明的就是不一定是fossil fuel引起的,因为第一,可能只是一些地区气温的上升,或者由于大气循环,第二,由于其他地方的测量站也不多,不好妄下定论
E 很好证明是clould cover增加引起的(完全没提到)
6. The discussion of climate in the passage suggests which of the following conclusions?
Ⅰ Climate is not perfectly stable, and slight regional temperature variations can be considered a normal feature of the environment. 定位第三段
Ⅱ We are unable at present to measure global temperature changes precisely 定位最后一段
Ⅲ The most important cause of regional climatic fluctuations is the change in CO2 levels in the atmosphere. most太绝对,没说co2一定是最主要的
A Ⅰ only
B Ⅲ only
C Ⅰ and Ⅱ only
D Ⅱ and Ⅲ only
E Ⅰ.Ⅱ. and Ⅲ
7. All of the following can be found in the author's discussion of climate EXCEPT.
A a statement about the effects of increased volcanic activity on the Earth's temperatures
B an indication of the effect of an increase in water vapor in the atmosphere
C a contrast between two theories about the effects of a lowering of CO2 levels in the atmosphere
D a generalization about the efficiency of meteorological recording stations
E a hypothesis about the relationship between atmospheric gases and changes in climate
A第一段
B第一段
C第二段According to one respectable theory, if the atmospheric CO2 concentration were halved, the Earth would become completely covered with ice. Another equally respectable theory, however, states that a halving of respectable theory, however, states that a halving of the CO2 concentration would lead only to a reduction in global temperatures of 3℃.
D没有generalization efficiency,只是说数量
E第三段,co2和气候的关系 |
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