Ⅰ. 根据语境及汉语提示写出正确的单词或短语
1. the complex (复杂的)structure of the human brain
2. pass up(错过)the opportunity
3. a TV commercial (商业广告)featuring Maotai liquor
4. have second thoughts犹豫, 产生怀疑
5. symbolize (代表)good and evil
6. an alternative (可供选择的)solution
7. under certain circumstances(情况)
8. a mixture (混合)of love and hate
9. a feeling of affection(喜爱)
10. a qualified (称职的, 合格的)teacher
