在黑茶制造中，儿茶素氧化还原中所产生的醇、醛、酸等物质与（）综合起反应，使茶汤有酸辣味。
A.茶黄素
B.儿茶素
C.咖啡碱
D.氨基酸
参考答案：D
连词成句。
1. many, How, people, are, in, there, family, his (?)
2. Look, is, That, aunt, Bill's (!)
3. father, My, a, is, doctor (.)
4. are, they, Who (?)
5. and, Come, my, meet, family (!)
