Will there always be 31 water? When you consider how necessary water is to each and every one of us and to all 32 (live) things, and when you observe how man has mismanaged other 33 (nature) resources, you may have reason to worry. Man has badly polluted his sources of water 34 Earth. And he uses more and more water each day. Can man learn to treat 35 (pollute) water for reuse fast enough 36 (keep) pace with the world’s technology and 37 (grow) population?
At the present time there is no serious shortage of water in the United States. Water, however, is not 38 able to meet all the local needs. Some areas, such as the southwestern part of our country, get less rain than 39 . In these areas, water must be brought in from 40 outside. Los Angeles, for example, must obtain its water from sources hundreds of miles away in the Colorado River and the rivers of northern California.31.enough 32.living 33.natural 34.on 35.polluted
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(答案→)31.enough 32.living 33.natural 34.on 35.polluted
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