题目

    Supermarkets are trying out new computers that make shopping carts more intelligent（具备智能的）. They will help shoppers find paper cups or toilet soap, and keep a record of the bill.     The touch-screen devices（触摸屏装置）are on show at the Food Marketing Institute’s exhibition here this week. “These devices are able to create value and get you around the store quicker,” said Michael Alexandor, manager of Springboard Retail Networks Inc, which makes a smart cart computer called the Concierge.      Canadian stores will test the Concierge in July. A simil（2011?安溪县质检）下列数值最接近实际情况的是（　　）A．你现在所用的物理课本长度约为26cmB．一个中等个子中学生的体重约为1000NC．初中生跑100m所需的时间约为8sD．一个鸡蛋的质量约为500g