The physical shape and coloring of many animals are the result of gradual ______ to particular circumstances.

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问题 The physical shape and coloring of many animals are the result of gradual ______ to particular circumstances.

选项 A、modification
B、variation
C、application
D、adaptation

答案D

解析 adaptation适应。modification修改,修饰。variation变化,变动。application申请(表,书)。
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