硫脲类药物的作用机制有（） A.抑制甲状腺过氧化物酶 B.抑制甲状腺激素的生物合成

补全对话 根据对话内容，从方框中选出适当的选项补全对话（ 共4小题， 每小题1分，计4分）
Nick : Mum!
Mum:     小题1:    
Nick : Is my computer game on the table?
Mum: No, it isn’t．It’s on the bookcase.
Nick : Oh．  小题2:     Are they on the bookcase, too?
Mum:      小题3:    They are on the chair．
Nick : OK．And where are my keys?
Mum:      小题4:     
Nick: Oh, yes．Thanks, Mum.

A. Yes?         B. No, they aren’t. C. Where are my books? D. The keys? They’re on the table.