成人骨骼正常声像图上能显示什么结构（）
A.骨外膜
B.骨内膜
C.骨皮质
D.骨松质
E.骨髓
参考答案：C
She will tell us why she feels so strongly that each of us has a role _______ in making the earth a better
place to live on. [ ]
A. to have played
B. to play
C. to be played
D. to be playing
一病人不能快速准确完成指鼻动作，其病变发生在（ ）
A．脊髓
B．大脑
C．小脑
D．脑干
