Lynn said she _________ a pen.[ ]
A. buy
B. bought
C. buys
D. buying
答案：B
下列各项中属于相对性状的是[ ]
A．玉米的黄粒和圆粒
B．家鸡长腿和毛腿
C．绵羊的白毛和黑毛
D．豌豆的高茎和豆荚的绿色
