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≤2时/(326)27.What does the author focus on in the last paragraph?A.Her precious gift.B.Her father's firm confidence.6C.Her future expectation.于P的对称D.Her father's original motivation.值为13+2Conifers (are generally better than broad-leaved trees at purifying air from pollu-tants.But deciduous (trees may be better at taking in particle-bound pollution.A7+2new study led by the University of Gothenburg shows that the best trees for air purification的选项depend on the type of pollutants involved.,有Trees and other greenery in cities provide many benefits that are important for the well-being of residents.Leaves and needles on trees filter air pollutants and reduce exposure to poi-sonous substances in the air.But which trees purify the air most effectively?Researchers fromthe University of Gothenburg have collected leaves and needles from eleven different treesgrowing in the same place in the Gothenburg Botanical Garden (GBG)to analyse which sub-stances they have absorbed."This tree collection provides a unique opportunity to test many different species of treeswith similar environmental conditions and exposure to air pollutants,"said Jenny Klingberg,aresearcher of the GBG.A total of 32 different pollutants were analysed,some of which are bound to particles ofvarious sizes..Others are gaseous,.This project has focused on PAHs(多环芳径).Incities,traffic is the biggest source of these pollutants,which are released due to incomplete burningin engines."Our analyses show that different species of trees have different abilities to absorb airpollutants.Conifers generally absorb more gaseous PAHs than broad-leaved trees.Anotheradvantage of conifers is that they also act as air purifiers in winter,when air pollution isusually at its highest,"said Jenny Klingberg."This study contributes to improving our understanding of the ability of trees to clean theair and which species are best at absorbing air pollutants,"said Jenny Klingberg.This knowl-edge is important for urban planning when designing sustainable cities.While trees and green-ery can contribute to better air quality in cities,at the end of the day,the most importantmeasure is to reduce emissions.【高三英语第6页(共12页】·23-475C·
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