—_____ your brother like hamburgers?

—No, he _____. [ ]

A. Do; doesn't

B. Do; don't

C. Does; doesn't

以下三个题基于下图所示的二叉树：

如果将该二叉树存储为对称序线索二叉树，则结点H的左线索指向哪一个结点？（）

A．结点A

B．结点C

C．结点E

D．结点G