— Sandy, _______ apple on the table is for you. Remember to eat it.

—Thanks, I will. _____ apple a day keeps the doctor away.

A．the; An

B．a; An

C．an; The

D．the; A

有关结膜伪膜，以下错误的说法是()

A．由脱落的结膜上皮、白细胞、病原体及纤维蛋白渗出物组成

B．见于严重病毒性或细菌性结膜炎

C．其形成仅在于渗出过程中结膜的反应程度不同

D．与结膜上皮结合牢固，强行剥离易出血

E．以上都不对