●Trees produce oxygen

　　2．____________A leafy tree produces as much oxygen in a season as 10 people inhale in a year.What many people don’t realize is that the forest also acts as a giant filter that cleans the air we breathe.Trees help clean the air by preventing airborne particles，reducing heat，and absorbing such pollutants.

　　●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 locking­up 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.

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