Depending on where you live，the stormwater may be piped to a treatment plant or it may run in natural channels to allow nature to remove the pollutants.Either way，the treatment of stormwater is costly.If you reduce the amount of stormwater runoff from your home or office，you reduce the need for treatment.

　　Water is rapidly becoming one of our most precious resources and it is not as abundant as you may think.In the year 2000，the United States used approximately 326 billion gallons of fresh water per day.

　　20．What does the underlined sentence “America is just slightly behind the curve” mean?

　　A．Americans don't show interest in harvesting rainwater.

　　B．There is no need for Americans to harvest rainwater.

　　C．Harvesting rainwater in America is not that common.

　　D．Americans can't collect rainwater from the roof correctly.

　　答案　C　[句意理解题。从第三段“Many countries already rely heavily on rainwater.Bermuda，for example...However...”可知，美国的情况与Bermuda相反，在利用雨水这方面还跟不上潮流。故选C项。]

　　21．According to the passage，harvesting rainwater can ________.

　　A．benefit you economically and ecologically

　　B．benefit your health and the surroundings around

　　C．promote the development of economy and peace

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