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外语
Animal migration is a seasonal or periodic movement of animals in response to changes in climate or food ______, or to ensure re
Animal migration is a seasonal or periodic movement of animals in response to changes in climate or food ______, or to ensure re
admin
2011-04-26
46
问题
Animal migration is a seasonal or periodic movement of animals in response to changes in climate or food ______, or to ensure reproduction.
选项
A、alternation
B、availability
C、utilization
D、capacity
答案
B
解析
(availability可得性,可用性,有效性)。句意为:动物的移栖是指动物为了适应气候或食物可得性的变化,或为了保证繁殖而进行的季节性或周期性的迁徙。A.alternation轮流,交替;C.utilization利用;D.capacity能力,才能。
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