.

Though Lucy is only ___ 11-year-old girl, she has ___ gift for singing.

A．a; a

B．an; the

C．an; a

D．a; the

若一个几何体的主视图、左视图、俯视图分别是三角形、三角形、圆，则这个几何体可能是( )．

A．球
B．圆柱
C．圆锥
D．棱锥