日常问候语 — 英语阅读题

阅读短文，回答问题。 On Monday morning, Mia is at the school gate. She sees her teacher, Mr Green. She smiles and says, “Good morning, Mr Green.” A little later, Mia sees her friend Ben in the classroom. Ben smiles and says, “Hi, Mia!” Mia says, “Hello, Ben!” At lunch time, Mia sees her teacher again. She says, “Hello, Mr Green!” Mr Green smiles and says, “Hello, Mia!” Mia uses different greetings with her teacher and her friend, and she is friendly to both of them. Mia第一次见到Mr Green和Ben时，分别说了什么？