—Where does John live?

—He lives on _____ floor but he doesn't use a lift to go up and down.[ ]

A. nine

B. the ninth

C. ninth

D. a ninth

请问Mid（“八千里路云和月”，3，2）的返回值是什么？（）

A、“千里”

B、“里路”

C、“里”

D、“路云”