题目

—Thank you for giving us a wonderful Chinese dinner, Ms. Wang. —__________________.          A. Oh. I’m afraid I didn’t cook very well.          B. I’m glad you enjoy it. C. Come again when you are free.                D. It’s not polite of you to say so. 答案：B使用含碘食物可以预防甲状腺肿大，这里的“碘”是指（　　）A. 原子 B. 分子 C. 单质 D. 元素