A:It doesn’t matter.
B:My pleasure.
C:I don’t think you.
D:Sorry to hear that.
右侧漫画所示内容体现了对未成年人的( )
Most of my friends, _________ Sandy, Jimmy and Angela,are all kind to me.
骨含有比例适当的____和____ ,使骨具有一定的硬度和弹性,硬而不脆.