1. 生物   zoology   botany   biology   geometry   Hint Half-n-half Clue   2. 动物学   zoology   geography   astronomy   physics   Half-n-half Clue   3. 代数   algebra   geology   psychology   botany   Half-n-half Clue   4. 地质   chemistry   geology   trigonometry   algebra   Half-n-half Clue   5. 几何   philosophy   geology   geometry   zoology   Half-n-half Clue   6. 天文   chemistry   astronomy   history   trigonometry   Half-n-half Clue   7. 植物学   psychology   botany   chemistry   biology   Half-n-half Clue