— Dinner is ready. Help yourself!
— Wow! It _______ delicious. You are really good at cooking.
A:sounds
B:smells
C:feels
D:tastes
将10毫升血液放入盛有少量抗凝剂的试管中,静置一段时间以后,分为上、下两部分.在上、下两部分的交界处是( )