一、选题背景背景一:(新浪网2010年1月17日)“水管、下水道被冻住20多天了,上厕所都要走很远。”家住肥城路7号的丁女士说,自去年底那次大降温,他们整个楼上的水龙头就被冻了,全院47户居民提着桶到处找水吃。背景二:(新浪网2010年1月22日)在不少居民家中,水龙头开着,但是并没有用任何器具接水,清澈的自来水白白流进了下水道。居民们说,他们这 First, the background of a topic selection Background: (Sina January 17, 2010) “Water pipes, sewers have been frozen for more than 20 days, the toilet must go very far.” "Dingcheng Feicheng Road 7, who said Since the end of last year, the big drop in temperature, they flushed the whole upstairs faucet, the hospital 47 households carrying barrels around to find water to eat. Background II: (Sina January 22, 2010) In many residents home, faucet open, but did not use any equipment to receive water, white water flow into the sewer. Residents say they are