CREATE TABLE table_59028 ("Stage" TEXT, "Winner" TEXT, "General Classification" TEXT, "Mountains Classification" TEXT, "Points Classification" TEXT, "Sprints classification" TEXT, "Team Classification" TEXT)

What's the mountains classification of Stage 7 when Kim Kirchen was the general classification?
SELECT "Mountains Classification" FROM table_59028 WHERE "General Classification" = 'kim kirchen' AND "Stage" = '7'
SELECT "Mountains Classification" FROM "table_59028" WHERE "General Classification" = 'kim kirchen' AND "Stage" = '7'