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  3. A major reason for conflict in the animal world is territory. The male animal establishes an area. The size of the area is suffi

A major reason for conflict in the animal world is territory. The male animal establishes an area. The size of the area is suffi

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问题     A major reason for conflict in the animal world is territory. The male animal establishes an area. The size of the area is sufficient to provide food for him, his mate and their off spring. Migrating birds, for example, used up the best territory in the order of " first come, first【C1】______" The late arrivals may acquire【C2】______territories, but less food is available, or they are too close tothe【C3】______of the enemies of the species.【C4】______there is really insufficient food or the danger is very great, the animal will not【C5】______In this way, the members of the species which are less fit will not have offspring. When there is conflict【C6】______territory, animals will commonly use force, or a show of force, to decide which will stay and which will go. It is interesting to note,【C7】______, that animals seem to use only the minimum amount of force【C8】______to drive away the intruder. There is usually no killing. In the case of those animals which are capable of【C9】______each other great harm,【C10】______is a system for the losing animal to show the winning animal that he wishes to submit. When he shows this, the victor normally stops fighting.
【C8】
选项 A、compulsory
B、essential
C、necessary
D、vital
答案C
解析 考查句意。根据本句中的the minimum amount可知用必要的武力争斗。故答案为C。
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