颅脑外伤骨折涉及气窦时，可出现气窦积液，最常见于（）
A.额窦
B.上颌窦
C.前组筛窦
D.后组筛窦
E.蝶窦
参考答案：E
— ____ in this street? — I think Mr. Black is the richest man.
A．Whom do you think is the richest man
B．Who do you think is the richest man
C．Do you think who is the richest man
D．Do you think whom is the richest man
以思想品德教育为目的的演讲是（）演讲。
A.军事
B.道德
C.礼仪
D.法律
