咬上唇习惯易造成（）。
A.前牙反
B.后牙反
C.前牙深覆盖
D.开
E.下颌后缩
参考答案：A
We haven't settled the question of it is necessary for him to study abroad. [ ]
A．if
B．where
C．whether
D．that
盲肠癌病人最少见的并发症是
A．缺铁性贫血
B．大肠梗阻
C．右下腹包块
D．急性阑尾炎
E．原因不明的低热和消瘦
