—Are there _____ boats on the lake ?       

—Yes, there are _____.     [ ]

A. some, any    

B. some, some      

C. any, some    

D. any, any

插入鼻饲管至会厌部时，托起病人头部，使其下颌靠近胸骨柄的目的是

A．使鼻道通畅
B．避免咽后壁刺激
C．加大咽喉部通道的弧度
D．使喉肌放松便于胃管通过
E．使食管第一狭窄消失