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A major reason for 【21】______ in the animal world is territory. The male animal establishes an area. The size of the area is
A major reason for 【21】______ in the animal world is territory. The male animal establishes an area. The size of the area is
admin
2010-07-06
48
问题
A major reason for 【21】______ 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 【22】______ and their offspring. Migrating birds, for example, 【23】______ up the best territory in the order of" first come, first 【24】______ . "The late arrivals may acquire larger territories, but less food is 【25】______ ,or they are too close to the 【26】______ of the enemies of the species. 【27】______ there is really insufficient food or the danger is very great, the animal will not mate. In this way, the members of the species which are less fit will not have 【28】______ .
When there is conflict 【29】______ territory, animals will commonly use force, or 【30】______ of force, to decide which will stay and which will go. It is interesting to note, however, that animals seem to use the 【31】______ amount of force necessary to drive away the 【32】______ . There is usually no killing. In tile case of those animals which are 【33】______ of doing each other great harm, there is a system for the 【34】______ animal to show the winning animal that he wishes to 【35】______ . When he shows this, the 【36】______ normally stops fighting. Animals especially birds, which can easily escape from conflict seem to have no obstacle against killing, equally no mechanism 【37】______ submission. The defeated bird simply flies away. However, if two doves are 【38】______ 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 【39】______ of peace and, in its natural habitat,it is peaceful. But the" peace "mechanism does not 【40】______ in a cage.
【37】
选项
A、by
B、for
C、about
D、lined
答案
B
解析
该句意思是“那些能够轻易逃脱冲突的动物(尤其是鸟类)往往有能力对抗杀戮,相应的也就没有一套投降的体系。”B for表示该体系的内容。
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