抽象能力明显萌发的年龄段是（）
A、3岁前儿童
B、小班幼儿
C、中班幼儿
D、大班幼儿
参考答案：D
The villagers, _______ had been damaged by the flood, were given help by the Red Cross.
A．all of whose homes
B．whose all homes
C．all their homes
D．all of their homes
能够进行实时套利交易的基金是（）。
A.保本基金
B.LOF
C.伞形基金
D.ETF
