注射用油最好选择下列哪种方法灭菌

A、干热灭菌法

B、热压灭菌法

C、流通蒸汽灭菌法

D、紫外线灭菌法

E、微波灭菌法

American college students are increasingly        with credit card debt and the consequences can be rather serious.

A．boosted

B．burdened

C．substituted

D．dominated