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  3. A major reason for conflict in the animal world is territory. The male animal【C1】______an area. The size of the area is sufficie

A major reason for conflict in the animal world is territory. The male animal【C1】______an area. The size of the area is sufficie

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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 sufficient to provide food for him, his【C2】______and their offspring. Migrating birds, for example,【C3】______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.【C7】______there is really insufficient food or the danger is very great, the animal will not【C8】______. In this way, the members of the species which are less fit will not have offspring.
    When there is conflict【C9】______territory, animals will commonly use force, or a【C10】______of force, to decide which will stay and which will go. It is interesting to note, however, that animals seem to use【C11】______the minimum amount of force【C12】______to drive away the intruder. There is usually no killing. In the【C13】______of those animals which are capable of doing each other great harm,【C14】______is a system for the losing animal to show the winning animals that he【C15】______to submit. When he shows this, the【C16】______normally stops fighting. Animals(especially birds), which can easily escape from conflict, seem to have【C17】______obstacle against killing, and equally no mechanism【C18】______submission. The losing bird simply flies away. However, if two doves are【C19】______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 symbol of peace and, in its natural habitat, it is peaceful. But the "peace" mechanism does not【C20】______in a cage.
【C12】
选项 A、compulsory
B、essential
C、necessary
D、vital
答案C
解析 本题测试词义搭配。compulsory意为“强制的，必须做的”：essential意为“根本的，基本的”；necessary意为“必要的，必需的”，指达到某种目的而必须具备的；vital意为“极其重要的，生死攸关的”。所填之词修饰force，根据后面的driveaway the intruder可知，应选C。
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