属骨盆环单弓断裂骨折的是（）
A.一侧或双侧耻骨上下支骨折
B.髂骨翼骨折
C.耻骨联合分离
D.坐骨结节骨折
E.骶尾骨骨折
参考答案：A, C
On yesterday interview, he didn’t make a(n)_________
at all; what’s the matter with him?
A．apology
B．appearance
C．difference
D．change
20以内的素数有______个．
