Look at the Earth from space. Why does our planet look so blue？ Water is not just an important part of our planet. It is an important part of our body，too. More than half of our total body weight is water.
That's why we need to drink plenty of water every day. We drink water. We use it to cook，clean and carry waste out of our homes . Farmers use it to grow vegetables and crops like rice and corn.
Since the 1950s，people have been using more and more water. Scientists worry that soon there won't be enough water for the world. What can we do to help？Use water wisely （明智地）.
Right now，ships and factories are putting wastes into seas，rivers and so on. Even chemicals（化学制品）
We must do something to stop pollution. It's the best way to protect our world's most important natural resource（资源）.
A. Factories use it to make goods. B. Why is water so important for human？ C. However，there is less water than before. D. It can also kill fish and other water﹣living lives. E. Because water covers almost three quarters of the Earth. F. Our body loses water whenever we exercise or go to the toilet. |
