维系蛋白质分子一级结构的化学键是（）
A.肽键
B.氢键
C.二硫键
D.离子键
E.疏水键
参考答案：A
George（）too far . His coffee is still warm.
A. must have gone
B. might have gone
C. can't have gone
D. needn't have gone
化脓性炎是以大量的（）渗出为主，伴有不同程度的组织（）形成的炎症。
