桂花盛开，能闻到花的香味，说明 [ ]
A．分子很小
B．分子可分
C．分子在不停地运动
D．分子之间有间隔
答案：C
I _____ sooner but I didn't know that they were waiting for me.[ ]
A. had come
B. was coming
C. would come
D. would have come
食管癌组织用Lugol溶液染色呈（）
A.棕色
B.黄色
C.红色
D.绿色
E.粉色
