下列哪个表述是用来形容“每四年一次的”?( ) A: biannual B: annual C: biennial D: quadrennial

According to the comprehensive classification of flowers, Chrysanthemum morifolium belongs to . A: Annual and biennial flowers B: Woody flowers C: Perennial flowers D: Bulb flowers

Which kind of flower is mainly adopted in flower beds? A: Annual and biennial flower B: Perennial flower C: Bulb flower D: Succulent plant