A:1个
B:2个
C:3个
D:4个
(____)He wants to play baseball.
(____)Tim was so happy because he got a gift.
(____)Why are you wearing a Tshirt?
(____)I am going to the cinema tomorrow.
(____)It's difficult to fly a kite.
在显微镜的视野右上方有一物象,要移到视野的中央,应该向什么方向移动玻片()
如图表示基因、DNA、染色体、细胞核的关系,图中1、2、3、4依次表示( )