I am busy _________ English in my room. [ ]
A. to read
B. reading
C. read
答案:B
Colles骨折发生在()
A.桡骨的远端
B.桡骨干
C.桡骨的任何部位
D.尺骨的远端
E.桡骨近端
穹窿的长短轴之比为()。
A.大于10:1
B.10:1~5:1
C.5:1~3:1
D.小于3:1