1. 歴史   history   botany   psychology   philosophy   Hint Half-n-half Clue   2. 代数学   geology   algebra   psychology   history   Half-n-half Clue   3. 生物学   algebra   philosophy   trigonometry   biology   Half-n-half Clue   4. 心理学   algebra   geometry   astronomy   psychology   Half-n-half Clue   5. 微積分学   biology   calculus   geometry   psychology   Half-n-half Clue   6. 天文学   astronomy   zoology   geology   physics   Half-n-half Clue   7. 植物学   astronomy   geology   geometry   botany   Half-n-half Clue