人们一定还记得这样一幅宣传画 :一颗大大的眼睛下面有一颗大大的泪珠。上面一段话的大意是如果人类不注意保护水资源 ,那么地球上的最后一滴水将是人类自己的眼泪。这句话给人们带来警醒。中国是缺水的 ,要用占世界 6%的水去养活占世界 2 0 %的人。而北京的水资源就更紧缺 ,人 People must remember such a posters: there is a big tears beneath a big eye. The above passage to the effect that if humans do not pay attention to protecting water resources, then the last drop of water on Earth will be human tears of their own. This sentence gives people wake-up. China is short of water and needs to feed 6% of the world’s population with 6% of the world’s water. Beijing’s water resources are even more scarcer