1. 化学   philosophy   zoology   trigonometry   chemistry   Hint Half-n-half Clue   2. 地理学   calculus   geography   philosophy   history   Half-n-half Clue   3. 心理学   chemistry   psychology   biology   calculus   Half-n-half Clue   4. 地質学.   geology   physics   chemistry   geometry   Half-n-half Clue   5. 生物学   psychology   physics   biology   history   Half-n-half Clue   6. 幾何学　   physics   geometry   trigonometry   botany   Half-n-half Clue   7. 歴史   physics   calculus   psychology   history   Half-n-half Clue