1. 化學   history   botany   chemistry   trigonometry   Hint Half-n-half Clue   2. 地質   psychology   geology   calculus   trigonometry   Half-n-half Clue   3. 地理   psychology   geometry   algebra   geography   Half-n-half Clue   4. 物理   philosophy   trigonometry   psychology   physics   Half-n-half Clue   5. 代數   physics   algebra   chemistry   calculus   Half-n-half Clue   6. 幾何   geography   geometry   astronomy   history   Half-n-half Clue   7. 動物學   astronomy   zoology   geometry   physics   Half-n-half Clue