两个数相除的商是7.8，除数扩大10倍，被除数不变，商是（ ）
A．0.078
B．0.78
C．78
D．780
7.8÷10=0.78，
故选：B．
Within five years,cars will be a lot in our country.[ ]
A. cheap
B. cheaper
C. cheapest
D. the cheapest
汽车离去角
