用科学记数法表示的数1.2×103，则这个数的原数是（ ）
A．1200
B．20
C．12
D．12000
1.2×103=1 200．
故选A．
She a lot of Spanish by playing with the native boys and girls.
A．picked up
B．picked out
C．took up
D．took out
简述连铸的优越性？
