A:(,+∞)
B:(-∞,)
C:(0,)
D:(e,+∞)
在一片草坪中生长着蒲公英、铁树、月季、雪松、国槐,按照下列哪一项标准可把这些植物分为两大类?( )
Sometimes children are ____ young ____ they can't tell the bad from the good.