下列哪种物质不是聚合物？（）
A.葡萄糖
B.聚乙烯
C.纤维素
D.胰岛素
参考答案：A
When the fire started, Tom was to help all the children out. He is both brave and smart.
A．too calm
B．calm enough
C．too nervous
D．nervous enough
多饮，多尿，血糖增高属于( )
A．尿崩症B．糖尿病C．呆小症D．生长激素缺乏E．糖尿病酮症酸中毒
