[解析]
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W:Good afternoon,doctor.
M:Good afternoon,Mrs Brown.Well,what's wrong with this little boy?
W:He is my son,Jim.He's got a cough.
M:How long has he been like this?
W:Ever since last night.
M:Has he had anything to eat today?
W:Yes.He had a little milk and an egg this morning.
M:Well,Mrs Brown,I think he's caught a cold.
W:Is it serious?
M:No,it's nothing serious,but he'd better stay at home and rest.
W:Thank you very much.
M:You're welcome.