在超临界流体色谱中，应用最为广泛的流动相是______，其优点是无色、无味、无毒、容易获得，对各类有机物溶解性好
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A. sad
B. solemn
C. happy
D. funeral
W: I‘ m terribly sorry I‘ m late. I had rather a difficult time finding your office.
M:__________
A. Saying sorry won" t be enough for being late. You have to account for what you" ve done.
B. That" s all right. Please sit down and I" 11 start to ask you a few questions.
C. You needn" t saying sorry. It" s often the case.
D. Put on your name in the attendance record and go to your work.
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