— I wonder if I can board the plane with this return ticket.

— There _____ be no problem. Your ticket is valid until the end of this month. [ ]

A. must

B. shall

C. should

D. might

下列原料中原刺激味蕾产生味觉的是（）。

A.苹果

B.茶

C.淀粉

D.油

E.橙子