●Trees clean the soil

　　The term phytoremediation is a fancy word for the absorption of dangerous chemicals and other pollutants that have entered the soil. __3__ Trees filter(过滤) sewage and farm chemicals, reduce the effects of animal wastes, clean roadside spills and so on.

　　●Trees are carbon sinks

　　To produce its food, a tree absorbs and locks away carbon dioxide in the wood, roots and leaves. Carbon dioxide is a global warming suspect. __4__. This locking－up process “stores” carbon as wood and not as a “greenhouse” gas.

　　●__5__

　　Trees block urban noise almost as effectively as stone walls. Trees, planted at strategic points in a neighborhood or around your house, can reduce major noises from freeways and airports.

　　A．We could not exist as we do if there were no trees

　　B．Trees help clean the sky

　　C．A forest is a carbon storage area that can lock up as much carbon as it produces

　　D．Trees control noise pollution

　　E．Man has been planting trees to make the planet a more beautiful world

　　F．The modern human community has other more practical reasons to admire and honor trees

　　G．Trees can either store harmful pollutants or change the pollutants into less harmful forms

　　语篇解读：树对人类的生存环境起着重要的作用。无论是天然林还是人工林，都在美化着这个星球。树在哪些方面造福我们呢？

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