Although the world is hungry, it is even thirstier. While nearly 3/4 of the earth is covered with water, we are short of drinking water.
How can we avoid (避免) a serious water shortage? Then, we should protect our water resources and not pollute them. Lastly, we should discover ways to reuse water. But people's need for water is increasing day by day. We still don't have enough water. What else can we do?
There is plenty of water in the sea. But we need to take the salt away from the sea water. If scientists can find cheaper ways to do it, we can solve the problem of the shortage of water.
| A. First, we should save water and not waste it. B. This is very expensive. C. Scientists have got some achievements in this field. D. The sea seems to have the best answer. E. This is because about 97% of the water on the earth is sea water. |
