看图补全对话。

Tom: Hello, this is Tom speaking.

Grandma: Hi, Tom, this is grandma. What is your mother doing?

Tom: My mother is c_____________.

Grandma: What is your father doing?

Tom: My father is s_____________ on the sofa.

Grandma: What are you doing, Tom?

Tom: I am d_____________ my homework.

Grandma: Good boy! What are Peter and Cindy doing?

Tom: Peter is d_____________ on the wall (墙壁) and Cindy is c_____________.

Grandma: Oh, my goodness (天哪)!

中枢兴奋药中，"能促进大脑皮质细胞代谢"属于（）

A.咖啡因

B.苯二氮类

C.尼可刹米（可拉明）

D.山梗菜碱（洛贝林）

E.吡拉西坦（脑复康）