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

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

admin2005-01-30  85
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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