1. 心理学   psychology   calculus   philosophy   botany   Hint Half-n-half Clue   2. 生物学   psychology   physics   chemistry   biology   Half-n-half Clue   3. 地質学.   geology   botany   zoology   psychology   Half-n-half Clue   4. 哲学   botany   philosophy   geography   trigonometry   Half-n-half Clue   5. 代数学   algebra   geology   calculus   psychology   Half-n-half Clue   6. 天文学   algebra   astronomy   philosophy   zoology   Half-n-half Clue   7. 化学   geometry   algebra   chemistry   astronomy   Half-n-half Clue