A:钙片+鱼肝油
B:钙片+维生素C
C:碘盐+维生素C
D:鱼肝油+维生素C
当北京市白昼最长时,太阳光直射的纬线是( )
A. Yes, it is.
B. No, I'm not.
C. Yes, I was.
D. I'm fine, thank you.
E. No, it wasn't.