Look at the timetable. Hurry up! Flight 9598 ______ off at 12:18.

A．takes

B．took

C．will be taken

D．has taken

咽壁纤维层在咽后壁中线部分特别坚韧，构成了（）。

A.咽后隙

B.咽旁隙

C.咽中缩肌

D.咽缝

E.咽囊