头颅侧位摄影时与胶片垂直的标志线是
A．听鼻线B．听口线C．瞳间线D．听眦线E．听眶线
参考答案：C
解析：瞳间线垂直于胶片。
The chairman thought_________ necessary to invite Professor Smith to speak at the meeting. [ ]
A. that
B. it
C. this
D. him
Could you tell me______for Hong Kong?
A．when will they leave Beijing
B．when would they leave Beijing
C．when they will leave Beijing
D．when did they leave Beijing
