A：
B：
C：
D：
apples；many；so(.)
从方框中选择恰当的语句，补全对话。
A.Yes, she is.
B.He's my brother.
C.No, he isn't.
D.He's my brother.
Cheng Jie: Who's that boy?
Amy:____
Cheng Jie: Is she your mother?
Cheng Jie: Is he your father?
二次函数y=ax2+bx+c（a≠0）的函数值y与自变量x的四组对应值如表所示：则方程ax2+bx+c=0的根的个数是（ ）
x
6.15
6.18
6.21
6.24
y
0.02
﹣0.01
0.11
