2. 外语
  3. A major mason for conflict in the animal world is territory. The male animal【C1】______an area. The size of the area is sufficien

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

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问题     A major mason 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【C6】______food is available, or they are too close to the【C7】______of the enemies of the species.
    When there is conflict over territory, animals will commonly use force, or a【C8】______of force, to decide which will stay and which will go. It is interesting to note,【C9】______, that animals seem to use only the【C10】______ amount of force necessary to drive away the intruder. There is usually no killing. In the【C11】______of those animals which are capable【C12】______doing each other harm, there is a【C13】______for the losing animal to show the winning animal that he wishes to submit.
    When he shows this, the【C14】______normally stops fighting. Animals( especially birds),【C15】______can easily escape from conflict seem to have no【C16】______against killing, and equally no mechanism for【C17】______. The losing bird simply flies away. However, two pigeons are placed in a cage, and they start if fighting, they will continue to fight【C18】______one kills the other. We all think of the pigeon as a【C19】______of peace and, in its natural habitat, it is peaceful. But the "peace" mechanism does not【C20】______in a cage.
【C18】
选项 A、when
B、until
C、as
D、while
答案B
解析 此题为考查副词用法的语法类题目。通过语法判断，one kills the other 是主句的状语从句。原文此处的意思是：当两只鸽子被放在同一个笼子里，如果它们一开始就打架的话，那么直到有一方被杀死，战争才会停止。所以连接副词要用until。
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大学英语四级

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