下列因素中（①导体两端的电压②导体长度③通过导体的电流④导体的横截面积⑤导体的材料）影响电阻大小的有（　　）

A．①③

B．①⑤

C．②④⑤

D．②③

Nanjing is a beautiful city. It won "China Human Habitat Environment Prize" _____ 2008.[ ]

A. at

B. on

C. in

D. by