[单项选择]

A major reason for conflict in the animal world is territory. The male animal (1) an area. The size of the area is sufficient to provide food for him， his (2) and their offspring. Migrating birds, for example, (3) up the best territory in the order of "first come, first (4) ." The late arrivals may acquire (5) territories, but less food is available, or they are too close to the (6) of the enemies of the species. (7) there is really insufficient food or the danger is very great, the animal will not (8) . In this way, the members of the species which are less fit will not have offspring.
When there is conflict (9) territory, animals will commonly use force, or a (10) of force, to decide which will stay and which will go. It is interesting to note, however, that animals seem to use (11) the minimum amount of force (12) to drive away the intruder. There is usua
A. placed
B. perched
C. deposited
D. stationed

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