2. 外语
  3. A major reason for conflict in the animal world is territory. The male animal【C1】______ an area. The size of the area is【C2】____

A major reason for conflict in the animal world is territory. The male animal【C1】______ an area. The size of the area is【C2】____

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问题       A major reason for conflict in the animal world is territory. The male animal【C1】______ an area. The size of the area is【C2】______ to provide food for him, his【C3】______ and their offspring.  Migrating birds,  for example, divide up the best territory in the order of "first come, first【C4】______　 "The late arrivals may acquire【C5】______ territories, but less food is available, or they are too close to the【C6】______　of the enemies of the species.
      When there is【C7】______ over territory, animals will commonly use force, or a【C8】______　 of force, to decide which will stay and which will go. It is interesting to note,【C9】______ ,that animals seem to use only the【C10】______　amount of force necessary to drive away the intruder. There is usually no killing. In the【C11】______ of those animals which are capable of doing each other harm, there is a【C12】______　for the losing animal to show the winning animal that he wishes to submit. When he shows this, the【C13】______ normally stops fighting. Animals (especially birds),which can【C14】______　escape from conflict seem to have no【C15】______　against killing, and equally no mechanism for【C16】______　The losing bird simply flies away. However, if two doves are 【C17】______　in a cage, and they start fighting, they will continue to fight until one kills the other. We all think of the dove as a【C18】______ of peace and,【C19】______　its  natural habitat, it is peaceful. But the "peace" mechanism does not【C20】______　in a cage.
【C20】
选项 A、appear
B、continue
C、apply
D、work
答案D
解析 work起作用。
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