A: Hi，Lisa! You look upset. ____.
B: Yes. I did badly in the math exam. I'm afraid to tell my parents about it. I think they will be unhappy.
A: ____. Though your parents are strict with you, they also love you.
B: You are right. But what can I do?
A: ____. Then, work hard at your math. And I can help you with it.
B: It's really kind of you. ____.
A: You can come to my house after school every day.
B: Thank you so much!
A: ____.
色体，在有丝分裂前期，细胞