下列β-内酰胺类抗生素中，属于碳青霉烯类的药物有（）

A.阿莫西林

B.沙纳霉素

C.氨曲南

D.亚胺培南

E.美罗培南

_______ China implements (实施) its control over the disputed regions, can its sovereignty

and interests be defended.[ ]

A. If only  

B. Even if

C. Only if       

D. As if