The chairman told the speaker that she ___ to speak a little louder so as to make herself _____. [    ]

A. was expected; heard  

B. had expected; hear  

C had hoped; hear  

D. was hoped; heard

用于贲门失迟缓症的诊断（）。

A.食管通过显像

B.胃食管反流显像

C.胃排空显像

D.十二指肠-胃反流显像

E.Barrett食管显像