— Shall we go to the art exhibition right away? 

— _____. [ ]

A. It is your opinion

B. I don't mind

C. It's all up to you

D. That's your decision

中气相色谱法测定公共场所空气中甲醛，采集甲醛样品时，抽气速度应为（）L／min。

A.0.1

B.0.5

C.1.0

D.10