时针走1大格表示（ ）时，分针走1大格表示（ ）分。
1，5
If someone invites you to go to his party, but you have no time, what should you not say?__________
A．Sorry, I can’t. I have to study for a test.
B．Sorry, I’m visiting my aunt.
C．I’d love to ,but I have no time.
D．No, thanks.
家兔的毛色中，白色和黑色是一对相对性状。请你分析下列4组杂交组合的亲子代性状，其中，体现出了性状分离的一组是（）
