（）的职工无特种作业操作证从事特种作业，属违章作业。
参考答案：企业、事业单位
买同样的书，花钱的总价与（ ）成正比例．
A．书的本数
B．书的页数
C．书的单价
D．不能确定
China has a growing number of middle-class parents who _____ for years to get their only child into a top school．
A．had been saved
B．have saved
C．had saved
D．have been saved
