Ⅱ级（）。

A.瘤细胞仅侵及表皮层内，即原位癌

B.瘤细胞已侵及真皮 * * 层

C.沿真皮 * * 层和网状层间扩展，但尚未侵及真皮网状层

D.侵及真皮网状层

E.已侵入皮下组织

—More than fifty students competed _______each other in the composition competition.

—But they could only compete _______three medals.

A．in; for

B．against; with

C．against; on

D．with; for