题目

将蒜瓣种在土壤里能长成一个新的植物体，这种方法属于（   ）     A．用根繁殖            B．营养繁殖         C．组织培养           D．种子繁殖 答案：B Jack is a careless boy．He doesn't write as ________ as Mary． [　　] A．careful B．more carefully C．carefully D．more careful