問題詳情
23. The most important pigments in floral coloration are_____； the red and orange pigments of flowers are usually______.
(A) anthocyanins; betacyanins.
(B) tannoids; flavonoids.
(C) flavonoids; carotenoids.
(D) carotenoids; betacyanins.
(E) betacyanins; flavonoids.
參考答案
答案：99
統計：A:0,B:0,C:0,D:0,E:0
難度：計算中