下列对招标投标的任务表述正确的是（）。
A．为招标人择优选定中标人
B．获得高质量的工程、货物或服务
C．节省投资
D．与中标人签订合同
参考答案：A
So lost in their computers____that leaders at summer computer camps often have to force them to break for sports and games.
A．became the children
B．become the children
C．had the children become
D．do the children become
股票价格指数期货的出现主要是为了规避( )。
A．违约风险B．市场风险C．系统性风险D．非系统性风险
