1. 哲学   calculus   physics   algebra   philosophy   Hint Half-n-half Clue   2. 地理   geography   geometry   botany   biology   Half-n-half Clue   3. 心理学   philosophy   geometry   psychology   trigonometry   Half-n-half Clue   4. 几何   psychology   geometry   geology   philosophy   Half-n-half Clue   5. 天文   astronomy   physics   philosophy   psychology   Half-n-half Clue   6. 微积分   philosophy   trigonometry   botany   calculus   Half-n-half Clue   7. 生物   chemistry   zoology   biology   calculus   Half-n-half Clue