以下哪一项给制造业创造便利的不是由电子商务带来的（）
A.增加单证费用
B.改造供应链
C.降低时间成本
D.设计网络化
参考答案：B
Recently a survey _______ prices of the same goods in two different supermarkets has caused heated debate among citizens.
A．compared
B．comparing
C．compares
D．being compared
y _______ prices of the same goods in two different supermarkets has caused heated debate among citizens.