椎动脉造影常规标准体位应选（） A.正位 B.水平侧位 C.正位+斜位 D.正位+水

A：It’s hard to believe there are so many people here．
B：Yes．（56）______
A：Who’s that man over there?
B：（57）________
A：Yes．Is he Sandy’s father?
B：No，he’s Sandy’s teacher．（58）_______．
A：And the room is very big and clean，and the music sounds good，too．
B：I agree．（59）_______ I’m a little hungry．
A：No，thanks．（60）______ Give me some chips，please．
B：OK．Here you are．
A：Thanks．
小题1:_________
小题2:_________ 
小题3:_________
小题4:_________ 
小题5:_________