Our need for water is increasing rapidly. Only if we take steps to deal with this problem now can we avoid a severe worldwide water shortage later on. One useful step we should take is to develop ways of reusing it.
Today, in most large cities water is used only once. But it is possible to pipe water that has been used to a purifying plant. There it can be filtered and treated with chemicals so that it can be used again just as if it were fresh from a spring.
But even if every large city purified and reused its water, we still would not have enough. Where could we turn next? To the oceans! All wed have to do to make use of the vast amount of sea-water is ―― remove the salt. This salt-removing process is already in use in many parts of the world. So if we take all these steps, well be in no danger of drying up!
Questions 26 to 28 are based on the passage you have just heard.
26. What percentage of the earths water can man actually use?
27. How can we avoid a worldwide water shortage in the future?
28. How can sea-water be turned into fresh water?
Passage Two
Mrs. Jones was very fond of singing. She had a good voice, except that some of her high notes tended to sound like a gate, which someone had forgotten to oil. Mrs. Jones was very conscious of this weakness, and took every opportunity she could find to practice these high notes. As she lived in a small house where she could not practice without disturbing the rest of the family, she usually went for long walks along the country roads whenever she had time, and practiced her high notes there. Whenever she heard a car or a person coming along the road, she stopped and waited until she could no longer be heard before she started practicing again, because she was a shy person, and because she was sensitive about those high notes.
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