1. 哲學   philosophy   astronomy   trigonometry   physics   Hint Half-n-half Clue   2. 天文   psychology   astronomy   chemistry   calculus   Half-n-half Clue   3. 地理   algebra   chemistry   geography   psychology   Half-n-half Clue   4. 代數   botany   trigonometry   algebra   biology   Half-n-half Clue   5. 心理學   geography   history   psychology   botany   Half-n-half Clue   6. 生物   trigonometry   astronomy   biology   calculus   Half-n-half Clue   7. 地質   algebra   geology   astronomy   geometry   Half-n-half Clue