航程越大，飞行则越远。现阶段飞机分为：（）、（）和（）三种航程！
参考答案：越太平洋远程飞行；中程飞行；短程飞行
We haven't seen each other for 20 years, but I recognized him _____ I saw him．
Which of the following is wrong ?
A．immediately
B．the moment
C．as soon as
D．while
患者1周前“上感”,因突然眩晕,恶心、呕吐伴耳鸣2 h就诊，改变头位眩晕加重，查体：听力下降，水平眼震。其原因最可能是：()
A．中枢性眩晕
B．血管性晕厥
C．周围性眩晕
D．非系统性眩晕
