游离香豆素易溶于乙醚、氯仿、丙酮、甲醇等有机溶剂。
参考答案：对
馒头、面包松软多孔，制作时主要与下列哪种生物有关……………( )
A．酵母菌
B．青霉
C．曲霉
D．乳酸茵
There _______ many kinds of trees and flowers in the forest. [ ]
A. is
B. are
C. has
D. have
