3月24日是世界结核病防治日。下列关于结核杆菌的描述正确的是：     

   This is a picture of Mr Black's family. The man is Mr Black. The woman is Mrs Black. They have a son and a daughter. The son is behind Mr Black. He looks like his mother. His name is Mike. He's thirteen. Their daughter, Ann is behind Mrs Black. She is eleven. Mike and Ann are in the same school. But they are not in the same grade. Mike is in Grade Nine. Ann is in Grade Seven. They are good students at school. Mike likes English, but he doesn't like math. Ann likes Chinese and math. She also likes singing English songs.
根据短文内容完成下列句子，每空一词。

下列各句中没有语病的一项是（   ）

某顾客在商场购物，一番细心挑选后仍不满意，转身准备离去。这时，一直面带微笑的售货员改变了态度，挖苦地说：“一看就知道是个没钱的主儿……”，售货员的行为        （  ）

①违背了社会主义职业道德    ②违背了为人民服务的基本原则

③违背了对人民负责的原则    ④符合社会职业道德的基本规范