What you said his sorrows(悲伤).
A:added
B:added to
C:added up
D:added up to
“野火烧不尽,春风吹又生”,与之相似的生理现象是( )
如图所示物体AB通过凸透镜所成正立、放大的像A′B′,请画出凸透镜的位置,并确定该透镜焦点F.