— I have to get to the post office by six o'clock, but it is almost six now.

— _______. This clock is fifteen minutes fast.

[      ]

A. That's too bad

B. Sounds good

C. Sure, you can

D. Take it easy

平静呼吸时，吸气末与呼气末的肺内压是（）

A.等于大气压

B.高于大气压

C.低于大气压

D.低于胸内压

E.高于胸内压