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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
【B9】
选项
答案M
解析 根据空前的不定式符号to可知，空处应填动词原形。符合要求的选项有E、F、L、M。根据第三段第二句“Still，this pollution did not really threaten the marine environment．”和第四句“This situation changed，however，when suddenly factories began pouring…”可知，之前的污染并没有威胁海洋环境，但当工厂开始向海洋中倾倒大量材料的时候，情况发生了改变，海洋污染开始对海洋生物造成威胁。故选M。
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