单项选择题

M: What class did you have this afternoon, Kate
W: A chemistry class. We’ve got a new chemistry teacher this term.
M: Who is it
W: James Black. He told us to call Jim, and not to call him Mr Black.
M: Oh, James Black. I know him. He’s a little thin man who smiles a lot.
W: Yes, but many of us are afraid of him.
M: Really But I hear he’s a very good teacher.
W: Yes, he is. His classes are always lively and interesting. And we all watch and listen to him very carefully in his class.
M: It’s important to watch carefully when you’re studying chemistry, I think.
W: Jim often says that too, so we are never allowed to do anything without watching.

What does the teacher ask his students to call him()

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