骨缺血坏死最常见的部位是()
A.肱骨头
B.股骨头
C.股骨外髁
D.桡骨小头
E.髌骨
参考答案:B
解析:股骨头缺血坏死是股骨颈骨折最常见的并发症。
隋朝时开凿的南北大运河以 为中心 [ ]
A.长安
B.涿都
C.洛阳
D.余杭
Don't worry. There is _____ water in the bottle. [ ]
A. little
B. many
C. a little
D. a few