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【单选题】

Soot(烟灰)and Snow:a Hot Combination ①New research from NASA scientistssuggests emissions(释放) of black soot alter the waysunlight reflects off snow.According to a computer simulation(模拟) ,black soot may Ibe responsible for 25 percent of obseryed globalwarming over the past century. ②Soot in the higher latitudes(纬度) of the Earth,where ice ismore common,absorbs more of the sun's energy and warmth than an icy,whitebackground.Dark-colorecl black carbon,or soot,absorbs sunlight,while lightercolored ice reflects sunlight. ③ Soot in areas with snow and ice mayplay an important role in climate change.Also,if snow and ice covered areasbegin melting,the warming effect increases,as the soot becomes moreconcentrated on the snow suce.“This provides a positive feedback,as glaciersand ice sheet smelt,they tend to get even dirtier," said Dr.James Hansen,aresearcher at NASA's Goddard Institute for Space Studies,New York. ④Hansen found soot's effect on snowalbedo(反照率) (solar energy reflected back to space),which may be contributing to trends toward early springs in the NorthernHemisphere,such as thinning Arctic sea ice,melting glaciers and permafrost(永冻层).Soot also is believed to play a role in changes in the atmosphere abovethe oceans and land. ⑤“Black carbon reduces the amount ofenergy reflected by snow back into space,thus heating the snow suce morethan if there were no black carbon," Hansen said.Soot's increasedabsorption of solar energy is especially effective in warming the world'sclimate."This forcing is unusually effective,causing twice as much globalwarming as a carbon-dioxide(二氧化物) forcing of the samemagnitude(量,大小)。" Hansen noted. ⑥ Hansen cautioned,although the role ofsoot in altering global climate is substantial,it does not alter the fact thatgreenhouse gases are the primary cause of' climate warming during the pastcentury.Such gases are expected to be the largest climate forcing for the restof this century. ⑦The researchers found that observedwarming in the Nort.hem Hemisphere was large in the winter and spring at middleand high latitudes.These observations were consistent with the researchers'climate model simulations,which showed some of the largest warming effectsoccurred when therc were heavy snow cover and sufficient sunlight.21. In the twentieth century,soot_______.

A.
produces much more global warming than a carbon-dioxide forcing of the same magnitude
B.
contrnouted t0 25 percent of o served global warming
C.
winter and spring
D.
the warming effects increase
E.
still surpass soot in warming the world's climate during the last century
F.
can be seen mostly in the Northern Hemisphere
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刷刷题刷刷变学霸
举一反三

【多选题】可见光云图上的反照率与()相关。

A.
土壤温度
B.
土壤湿度
C.
土壤类型
D.
植被覆盖

【单选题】氮氧化物的防治重点是

A.
定期维修设备,防止跑、冒、滴、漏
B.
加强通风排毒
C.
加强安全教育,积极做好肺水肿的防治,抢救
D.
定期健康检查,找出职业禁忌证,如有肺部疾患不得从事该作业
E.
以上都正确

【单选题】下列物质属于氧化物的一组是 [ ]

A.
大理石. 生石灰
B.
干冰. 四氧化三铁
C.
空气. 天然气
D.
甲醇. 酒精

【单选题】()氧化物属于中性氧化物。

A.
AlO3、Cr2O3、Fe2O3
B.
CaO、MnO、FeO
C.
SiO2、TiO2、SO2

【单选题】不属于氧化物得玻璃为()

A.
石英玻璃
B.
铅玻璃
C.
硼玻璃
D.
萤石玻璃