Unit 13 Were trying to save the earth! 单元 同步 阅读精练 一、完形填空。 Turn on the tap (龙头 ) and there is water.Getting water is so _1_ that you may think that there is an endless supply (供应 ) But it is not true.70% of the earth is _2_ by waterwe should call _3_ planet “ ocean” not “ earth” ！ But most of the water is salt water， leaving only a _4_ percent of fresh drinking water.Some _5_ including Spain， Italy， China and South Africa _6_ buy water from countries such as the US and Australia. Each person in t
