— I am gaining weight. I need to see a doctor.

— But I think you eat too much. __________.

A．Neglect(忽视) of health is doctor’s wealth

B．Laugh at your ills, and save doctors’ bills

C．Diet cures more than the doctor

D．An apple a day keeps the doctor away

戊二醛常用灭菌浓度为（）

A.1%

B.2%

C.2.5%

D.0.2%

E.5%