The soles of the Apolar bear’s feet are Bcovered with fur, which Cprovides stability on slippery, Dfreeze ground.

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问题 The soles of the Apolar bear’s feet are Bcovered with fur, which Cprovides stability on slippery, Dfreeze ground.

选项 A、 
B、 
C、 
D、 

答案D

解析 Freeze is a verb. An adjective is needed before the noun ground. Correction: frozen.
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