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  3. Preserve the Environment Throughout history man has changed his physical environment in order to improve his way of life.

Preserve the Environment Throughout history man has changed his physical environment in order to improve his way of life.

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问题                         Preserve the Environment
    Throughout history man has changed his physical environment in order to improve his way of life.
    With the tools of technology he has altered many physical features of the earth. He has transformed woodlands into farmland, and made lakes and reservoirs out of rivers for irrigation purposes or hydroelectric power. Man has also modified the face of the earth by draining marshes and cutting through mountains to build roads and railways.
    However, man’s changes to the physical environment have not always had beneficial results. Today, pollution of the air and water is an increasing danger to the health of the planet. Each day thousands of tons of gases come out of the exhausts of motor vehicles; smoke from factories pollutes the air of industrialized areas and the surrounding areas of countryside. The air in cities is becoming increasingly unhealthy.
    The pollution of water is equally harmful. In the sea, pollution from oil is increasing and is killing enormous numbers of algae(水藻) , fish and birds. The whole ecological balance of the sea is being changed. The same problem exists in rivers. Industrial wastes have already made many rivers lifeless.
    Conservationists believe that it is now necessary for man to limit the growth of technology in order to survive on earth.
The purpose of the writer is______.
选项 A、to reduce modern technology
B、to improve man’s way of life
C、to warn people not to change the natural environment
D、to call attention to the protection of the natural environment
答案D
解析 作者写此篇文章的目的是：A减少现代技术；B改善人们的生活方式；C警告人们不要改变自然环境；D号召人们注意保护自然环境。
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