单选题What is the best way to reduce the amount of soot?AInstalling exhaust filters on all trucks and buses.BBetter managing forest fires.CGetting Americans to give up SUVs.DMelting snow and ice.
单选题
What is the best way to reduce the amount of soot?
A
Installing exhaust filters on all trucks and buses.
B
Better managing forest fires.
C
Getting Americans to give up SUVs.
D
Melting snow and ice.
参考解析
解析：
soot指“烟灰”。录音中提到“…reducing the amount of soot in the air by…better managing forest fires is probably easier than getting Americans to give up SUVs”，其中SUV指“多功能车”，可见减少烟灰最好的方法之一是更好地对森林火灾进行管理。
【录音原文】
Because soot promotes the melting of snow and ice, it may exacerbate the problem of rising seas. The good news is that reducing the amount of soot in the air by installing exhaust filters on diesel trucks and buses and better managing forest fires is probably easier than getting Americans to give up SUVs. Fires are the source of about half the world’s soot.
soot指“烟灰”。录音中提到“…reducing the amount of soot in the air by…better managing forest fires is probably easier than getting Americans to give up SUVs”，其中SUV指“多功能车”，可见减少烟灰最好的方法之一是更好地对森林火灾进行管理。
【录音原文】
Because soot promotes the melting of snow and ice, it may exacerbate the problem of rising seas. The good news is that reducing the amount of soot in the air by installing exhaust filters on diesel trucks and buses and better managing forest fires is probably easier than getting Americans to give up SUVs. Fires are the source of about half the world’s soot.
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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.
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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. Which of the following statements of soot is NOT true?A: It absorbs sun's heat.B: It is responsible for climate change.C: It reflects sunlight.D:.It may account for a quarter of global warming over the past century.
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