下列属于相对性状的是[ ]

A．玉米的黄粒和圆粒

B．家鸡的长腿和毛腿

C．绵羊的白毛和黑毛

D．豌豆的高茎和豆荚的绿色

—______ is the population of Canada?

—I don't know. But I know it's ______ than that of China. [ ]

A. What; smaller

B. How much; smaller

C. How much; less

D. What; larger