一种黄酮类化合物与试剂2%二氯氧化锆（ZrOCl₂）甲醇溶液反应生成黄色的锆络合物。

若生成的锆络合物遇酸不稳定、褪色，说明该化合物含有（）

A.C₅-OH、C₄=O

B.C₃-OH、C₁=O

C.C₃-OH、C₄=O

D.C₈-OH、C₄=O

E.C₇-OH、C₄=O

F.C₂-OH、C₇-OH

Questions 11 to 15 are based on the following interview.

A. They are financially capable to make both ends meet living there.
B. They have high expectations for a quiet community of isolation
C. Some are disappointed but many more are happy with the community.
D. Some have high incomes and others are working class folks.