下列物质不属于铁合金的是（ ）
A．不锈钢
B．碳素钢
C．生铁
D．氧化铁
答案：D
The amount of money ______for the seriously sick child was soon collected.
A．to need
B．needed
C．needing
D．which needed
社会语言学产生的原因。
