题目

根据对话内容，从对话后方框内的选项中选出能填入空白处的最佳选项，使对话意思完整。选项中有两项为多余项。（At 3:00 pm, Tom and Amy are in the classroom.)Tom: Hi, Amy.Amy: Hi, Tom. What's wrong with you?Tom: I have a stomachache.Amy: What did you eat for lunch?Tom: Amy: I see. Maybe it is caused by them.Tom: Amy: Do you often just have snacks for lunch?Tom: Yes, very often.Amy: Oh! Snacks are bad for health.Tom: I know that. But I really enjoy them.Amy: Anyway, you should try to eat less.Tom: You are right. I'll try from now on.A.I guess so.B方程x（x+3）=（x+3）的根为（ ）A．x1=0，x2=3B．x1=1，x2=-3C．x=0D．x=-3