My summer job wasn't ________ fun, but it was ________ real learning experience for me.[ ]

A. a; a  

B. the; /

C. /; a  

D. a; /

下颌作侧方咀嚼时，工作侧上下颌的接触关系为

A．上牙舌尖的颊斜面与下牙颊尖的颊斜面接触
B．上牙舌尖的舌斜面与下牙颊尖的颊斜面接触
C．上牙颊尖的舌斜面与下牙颊尖的颊斜面接触
D．上牙颊尖的舌斜面与下牙颊尖的舌斜面接触
E．上牙舌尖的颊斜面与下牙舌尖的舌斜面接触