单选题 A major reason for conflict in the animal world
is territory. The mate animal establishes an area. The size of the area is
sufficient to provide food for him, his mate and their offspring. Migrating
birds, for example, used up the best territory in the order of "first come,
first {{U}} {{U}} 1 {{/U}} {{/U}}." The late arrivals may
acquire {{U}} {{U}} 2 {{/U}} {{/U}}, territories, but less food
is available, or they are too close to the {{U}} {{U}} 3
{{/U}} {{/U}}of the enemies of the species. {{U}} {{U}} 4
{{/U}} {{/U}}there is really insufficient food or the danger is very great,
the animal will not {{U}} {{U}} 5 {{/U}} {{/U}}. In this way,
the members of the species which are less fit will not have offspring. When
there is conflict {{U}} {{U}} 6 {{/U}} {{/U}}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, {{U}} {{U}} 7 {{/U}} {{/U}},
that animals seem to use only the minimum amount of force {{U}} {{U}}
8 {{/U}} {{/U}}to drive away the intruder. There is usually no kilting.
In the case of those animals which are capable of {{U}} {{U}} 9
{{/U}} {{/U}}each other great harm, {{U}} {{U}} 10 {{/U}}
{{/U}}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.
单选题
A. use
B. serve
C. served
D. used
【正确答案】
C
【答案解析】[解析] first come，first served“先到先得”；serve“为……尽力，招待，侍候”。根据句意可知，应选择C。
单选题
A. larger
B. better
C. smaller
D. worse
【正确答案】
A
【答案解析】[解析] 在这个句子中，后面有less food及too close to，此处larger与其形成对照。应选择A。