成人脊髓末端终止部位：（）
A．第1腰椎下缘
B．第2腰椎下缘
C．第1骶椎下缘
D．骶管裂孔
参考答案：A
How did it ______ that the plane had run out of fuel half way? [ ]
A. come about
B. come across
C. come over
D. come out
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