中晚期食管癌的典型症状是（）
A．持续性胸痛或背痛
B．进食时呛咳
C．进行性吞咽困难
D．食物停滞感或异物感
E．胸骨后疼痛或闷胀不适
参考答案：C
— Excuse me. Could you tell me ______?
— Yes, and New York is the most beautiful place that I have ever lived.
A．when your birthday is
B．what color your bike is
C．if I can join the music club
D．where you were born
固定桥粘接以后出现龈炎，其原因不可能是（）
A.牙龈组织受到压迫
B.粘固剂未完全去尽
C.固位体边缘不贴合，导致牙龈菌斑附着
D.烤瓷牙与邻牙触点不正确
E.牙周膜轻度创伤
