2. 考研
  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 to the【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.
【C1】
选项 A、use
B、serve
C、served
D、used
答案C
解析 考查语态。在这个句子中first come中的first指迁徙的鸟类，故第二个first也是指鸟，根据主谓的关系可将A、D排除：而主语“鸟”和serve应是被动的关系，故应选被动。故答案为C。
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