2. 外语
  3. 　　 A major reason for conflict in the animal world is territory. The male animal 【21】______ an area. The size of the area is

　　 A major reason for conflict in the animal world is territory. The male animal 【21】______ an area. The size of the area is

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问题 　　  A major reason for conflict in the animal world is territory. The male animal  【21】______   an area. The size of the area is sufficient to provide food for him, his  【22】______   and their offspring. Migrating birds, for example, divide up the best territory in the order of "first come, first  【23】______   " The late arrivals may acquire  【24】______   territories, but less food is  【25】______   , or they are too close to the  【26】______   of the enemies of the species.
     When there is conflict over territory, animals will commonly use force, or a  【27】______   of force, to decide which will stay and which will go. It is interesting to note, however, that animals seem to use only the   【28】______   amount of force necessary to drive away the intruder. There is usually no killing. In the  【29】______   of those animals which are capable of doing each other harm, there is a  【30】______   for the losing animal to show the  【31】______   animal that he wishes to submit. When he shows this, the  【32】______   normally stops fighting. Animals (especially birds), which can easily escape from conflict seem to have no  【33】______   against killing, and equally no  【34】______   for  【35】______   . The losing bird simply flies away. However, if two doves age  【36】______   in a cage, and they start fighting, they will  【37】______    to fight until one kills the other. We all think of the dove  【38】______   a   【39】______   of peace and, in its natural habitat, it is peaceful. But the "peace" mechanism does not  【40】______   in a cage.  
【23】
选项 A、used
B、got
C、served
D、gained
答案C
解析
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