Not only _____ polluted, but _____ crowded.

A．was the city; were the streets

B．the city was; the streets were

C．was the city; the streets were

D．the city was; were the streets

肝硬化主要表现为（）

A．IgA显著增高

B．IgD显著增高

C．IgG显著增高

D．IgM显著增高