問題詳情
159.
參考答案
答案：A
難度：困難0.225
統計：A(9),B(9),C(16),D(4),E(0)
難度：困難0.225
統計：A(9),B(9),C(16),D(4),E(0)
用户評論
【pretest】評論
Cartilage covering the ends of bones helps to protect the joints from wear and tear.
【pretest】評論
Cartilage covering the ends of bones helps to protect the joints from wear and tear.