小儿急性白血病的确诊主要依靠（）
A.家族史
B.症状和体征
C.血常规十血涂片查细胞形态
D.骨髓穿刺液涂片
E.组织化学染色
参考答案：D
A new iPad in the market costs about ______ of a second-hand one.
A．three timesofthe price
B．three times as much as the price
C．three times the price
D．three times more than the price
实行多元化市场战略是将出口额在世界各地市场平均分布。( )
