The feathers of birds (not only) protect their skin from injury and conserve (body heat), but also (function) in flight, courtsh

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问题 The feathers of birds (not only) protect their skin from injury and conserve (body heat), but also (function) in flight, courtship, camouflage, and sensory (perceptive).

选项 A、not only
B、body heat
C、function
D、perceptive

答案D

解析
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