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  3. The pollution of the earth’ s soil and water has become an issue of great concern. Until recently, most of that concern has focu

The pollution of the earth’ s soil and water has become an issue of great concern. Until recently, most of that concern has focu

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问题    The pollution of the earth’ s soil and water has become an issue of great concern. Until recently, most of that concern has focused on the land【B1】______of the planet, where pollution directly affects people in their daily lives. Now, however, we have begun to realize that marine pollution is【B2】______important. According to S. A. Patin, marine pollution is the situation that occurs when people introduce into the seas substances【B3】______to life, health, resources, activities or comforts. Marine pollution is far from new. For over a million years, people have thought of the sea as a【B4】______place to throw their garbage. And it is true that the sea has a great【B5】______for absorbing organic wastes. Some of these wastes are eaten directly by the larger fishes. Others quickly【B6】______into a kind of organic soup that provides food to【B7】______species of single-celled plant and animal life.
   As civilizations grew, more different pollutants were released into the seas. Still, this pollution did not really threaten the marine environment. The seas seemed capable of【B8】______with anything that people could throw at them. This situation changed, however, when suddenly factories began pouring enormous quantities of materials into the seas. Especially in some coastal areas near large cities, ocean pollution began to【B9】______marine life. For the first time, the oceans began to fail in their ability to【B10】______humanity’ s wastes.
   A. equally D. positive G. coping J. harmful M, threaten
   B. effect E. support H. convenient K. capacity N. countless
   C. portion F. lose I. approximately L. recycle O. dissolve
【B7】
选项
答案N
解析 空处应填形容词修饰species。符合要求的选项有D、N。根据句意和常识可知，海洋中的单细胞生物是有很多种的，因此这里指的是“无数种单细胞动植物”。故选N。
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