1. 微積分学   physics   calculus   chemistry   geology   Hint Half-n-half Clue   2. 三角法   botany   trigonometry   calculus   physics   Half-n-half Clue   3. 地理学   geography   physics   zoology   geometry   Half-n-half Clue   4. 幾何学　   history   chemistry   zoology   geometry   Half-n-half Clue   5. 地質学.   geology   trigonometry   astronomy   psychology   Half-n-half Clue   6. 歴史   calculus   history   algebra   psychology   Half-n-half Clue   7. 化学   geometry   chemistry   geology   biology   Half-n-half Clue