单项选择题

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 girls go to school together
M: Yes, they do. And I think it’s a good idea.
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().

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