产后第2天发现新生儿左臂肌肉软瘫，可能的诊断是：
A．臂丛神经损伤B．锁骨骨折C．肱骨骨折D．神经系统损伤E．脊髓神经损伤
参考答案：A
— Turn off the TV, Jack, _____ your homework now?
— Mum, just ten more minutes, please. [ ]
A. Should you be doing
B. Shouldn't you be doing
C. Couldn't you be doing
D. Will you be doing
动静脉畸形最佳检查方法为（）
A.CT
B.MRI
C.MRA
D.DSA
E.增强MRI
