W: At what age do children start school in your country
M: At five. How about in your country
W: At six. Do boys and gifts go to school together
M: Yes, they do. And I think it’s a good ideal
W: Do some children go on to university
M: Yes, they do.
W: What examinations do they take first
M: "O" levels and "A" levels.
W: Oh, but in our country they take "O" levels and "H" levels. How long do they usually stay at university
M: Three or four years.

What examinations must children take first before going to university in the man’s country().

A．"O" levels and "A" levels.
B．"O" levels and "H" levels.
C．"A" levels.