飞艇正常装配完成，静止于空气中时，应当是（）

A.头部上扬

B.尾部上扬

C.前后在同一水平线上

M: Do we have to get the opera tickets in advance

W: Certainly! Tickets at the door are usually sold at a higher price.

Q: What does the woman imply().

A. The tickets are more expensive than expected.

B. The tickets are sold in advance at half price.

C. It’s difficult to buy the tickets on the spot.

D. It’s better to buy the tickets beforehand.