1. 哲学   botany   history   philosophy   psychology   Hint Half-n-half Clue   2. 地理学   geography   chemistry   psychology   botany   Half-n-half Clue   3. 幾何学　   botany   geometry   chemistry   geography   Half-n-half Clue   4. 歴史   history   chemistry   biology   astronomy   Half-n-half Clue   5. 物理学   chemistry   geometry   physics   psychology   Half-n-half Clue   6. 植物学   astronomy   chemistry   psychology   botany   Half-n-half Clue   7. 地質学.   astronomy   calculus   geometry   geology   Half-n-half Clue