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完形填空。阅读下面短文，掌握其大意，然后从各题所给的四个选项A、B、C和D中，选出最佳答案。 The question of whether war is inevitable is one which has concerned many of the world’s great writers. Before 1 this question, it will be useful to introduce some 2 concepts. Conflict, 3 as opposition among social units-or individuals-directed against one another, is4 from competition, which 5 opposition among social units 6 seeking to obtain something which is 7 inadequate supply. Competitors may not know about one another, which those who 8 in a conflict do. Conflict and competition are both 9 of opposition. The meaning of opposition has been stated as a process by which social unit function in the disservice of one another, opposition is 10 contrasted to cooperation, a 11 by which social units function in the service of one another. These 12 are necessary because it is important to emphasize that competition between individuals or groups is inevitable in a world of limited 13 , but conflict Isn’s. Conflict, nevertheless, is very likely to occur and is probably an essential and desirable 14 of human societies. | 
