I have absolutely no ________ the students who get caught cheating in exams even though they were seriously punished.

A．influence on

B．sympathy for

C．concern about

D．complaint about

诊断食管癌最有价值的症状是（）

A.吞咽哽噎感或异物感

B.胸背部的疼痛

C.声音嘶哑

D.呛咳

E.不断加重的吞咽困难