第1题
The author is primarily concerned with______.
A.explaining the effects that the burning of fossil fuels might have on climate
B.illustrating the effects of carbon dioxide on atmospheric radiation
C.discussing effects that changes in the carbon dioxide level in the atmosphere might have on climate
D.challenging hypothesis about the effects of water vapor and carbon dioxide on climate
第2题
A.average daily temperatures worldwide could increase considerably
B.some sea level islands could be threatened by flooding
C.all coastal regions throughout the world could be at serious risk
D.all of the above
第3题
A、Driving a car
B、Traveling by plane
C、Cutting down trees
D、All the options
第4题
hanges are due to natural causes. However, some climate changes are caused by air pollution and these changes may increase.
If the pollution affects the level of carbon dioxide in the atmosphere, the results are likely to be serious. Carbon dioxide constitutes only a small part of the atmosphere. But it has an important function in maintaining the balance between radiation from the sun entering the atmosphere and radiation leaving the earth. Some of the radiation is absorbed by the earth and some is radiated back into the atmosphere. The carbon dioxide in the atmosphere prevents some of the radiation from leaving the atmosphere. Thus the heat remains in the atmosphere and carbon dioxide helps prevent the temperature of the earth from falling.
If the proportion of carbon dioxide in the atmosphere is increased as a result of air pollution, the temperature of the atmosphere may rise. This might eventually cause the ice in the North and South Poles to melt. If this happened, the sea level could rise and parts of the earth would be flooded. The likelihood of this happening is remote, but the possibility exists.
There is also a fairly strong possibility that the dust level in the atmosphere will rise as a result of industrial pollution. This dust pollution will reflect sunlight back into space. If this happens less sunlight will reach the earth and the temperature will fall.
Another danger comes from the destruction of the earth's vegetation such as the forests of Brazil, which are being cleared away for farmland and cities. Trees use carbon dioxide and their destruction may upset the balance of carbon dioxide in the atmosphere.
1.The text is mainly about ().
[A] the rise of the level of carbon dioxide caused by pollution
[B] the relationship between climate changes and air pollution
[C] the possibility of the eventual melting of the ice in the Poles
[D] the consequence of the destruction of the earth's vegetation
2.We learn from the text that the more dust there is in the atmosphere,() .
[A] the hotter we will feel on the earth
[B] the less sunlight will be reflected
[C] the higher the sea level will be
[D] the cooler the earth will become
第5题
A.carbon dioxide tends to alleviate environmental haze, while sulfurous gases usually increase it
B.carbon dioxide tends to increase temperatures by trapping sunlight, while sulfurous gases tend to decrease temperatures by blocking it
C.carbon dioxide tends to have an effect on the environment, while sulfurous gases for the most part do not
D.sulfurous gases have played an even more significant role than carbon dioxide in pushing environmental temperatures outside the habitable range
E.sulfurous gases tend to decrease the level of solar radiation outside the earth's atmosphere, while carbon dioxide plays only a negligible role
第6题
A.carbon dioxide tends to alleviate environmental haze, while sulfurous gases usually increase it
B.carbon dioxide tends to increase temperatures by trapping sunlight, while sulfurous gases tend to decrease temperatures by blocking it
C.carbon dioxide tends to have an effect on the environment, while sulfurous gases for the most part do not
D.sulfurous gases have played an even more significant role than carbon dioxide in pushing environmental temperatures outside the habitable range
E.sulfurous gases tend to decrease the level of solar radiation outside the earth's atmosphere, while carbon dioxide plays only a negligible role
第7题
A.average daily temperatures worldwide could increase considerably
B.some sea level islands could be threatened by flooding
C.all coastal regions throughout the world could be at serious risk
D.all of the above
第8题
A.carbon dioxide tends to alleviate environmental haze, while sulfurous gases usually increase it
B.carbon dioxide tends to increase temperatures by trapping sunlight, while sulfurous gases tend to decrease temperatures by blocking it
C.carbon dioxide tends to have an effect on the environment, while sulfurous gases for the most part do not
D.sulfurous gases have played an even more significant role than carbon dioxide in pushing environmental temperatures outside the habitable range
E.sulfurous gases tend to decrease the level of solar radiation outside the earth's atmosphere, while carbon dioxide plays only a negligible role
第9题
Choose the most appropriate words or phrases to complete the following passage. Every year there are changes 1)_________ (on/in) different parts of the world. Some of these changes are 2)___________ (due to/result in) natural causes. 3)__________ (Because/However), some climate changes are caused by air pollution and these changes may increase. If the pollution 4) __________ (effects/affects) the level of carbon dioxide(二氧化碳) in the atmosphere, the results 5) _____________ (are alike to/are likely to) be serious. Carbon dioxide constitutes only a small part of the 6) ___________ (atmosphere/climate), but it has an important function in 7) ____________ (maintaining/insisting) the balance between radiation 8) _____________ (to/from) the sun entering the atmosphere and radiation leaving the Earth. Some of the radiation is absorbed by the Earth and some is radiated back into the atmosphere. The carbon dioxide in the atmosphere prevents some of the radiation 9) _________ of/from) leaving the atmosphere. Thus the heat 10) _________ (remains/keeps) in the atmosphere and carbon dioxide helps to prevent the temperature of the Earth from falling. If the 11) __________ (rate/proportion) of carbon dioxide in the atmosphere is increased as a result of air pollution, the temperature of the atmosphere may 12) _________ (rise/fall). This might eventually cause the ice in the North and South Poles to melt. If this 13) __________ (happening/happened), the sea level could rise and parts of the Earth 14) ___________ (would/will) be flooded. The likelihood of this happening is unknown, but the possibility 15) ________ (exists/existed).
第10题
A.increases in the carbon dioxide content of sedimentary rocks
B.the formation of bodies of water
C.decreases in the level of nitrogen
D.the formation of clouds
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