— you like swimming? —No, I don't.[ ]
A. Can
B. Do
C. Does
答案：B
小分子的苯醌及萘醌类具有( )
A．无色B．多以游离状态存在C．多结合成诗存在D．升华性E．挥发性
青蛙：蝌蚪
A．蝴蝶：蛹 B．鲫鱼：鲤鱼C．蜘蛛：虫子 D．种子：树木
