根据情景提示，完成下列各题。
区寄不愿留为小吏的做法好不好？为什么？
设阿伏加德罗常数为NA，则下列说法正确的是（ ）
(____) What does your mother do?
(____) Oh, great!
(____) She's a nurse.
(____) Look! This is my mother.
(____) Oh! She's beautiful.
