肩关节后侧的穿刺体位是（）
A.上臂轻度外展、外诊
B.上臂轻度外展、内诊
C.上臂内收、外诊
D.上臂内收、内旋
E.上臂后伸
参考答案：B
—Listen! Is Tom singing in the classroom?
—No. It ____ be Tom. He has gone to Paris.[ ]
A. may not
B. needn't
C. can't
D. might
卵子无放射冠的动物是（）.
A.牛
B.猪
C.羊
D.兔
E.马
