2014
高考英语阅读理解巩固练习精品题（26）及答案 《江苏省华罗庚中学2013模拟》c at a supermarket in the usa, in june 1974, something groundbreaking happened. instead of inputting the price of a bar of chocolate by hand, the cashier（收银员） used a beam of light. she scanned（扫描） a series if black bars and spaces on the back of the packet and the name and price of the chocolate appeared instantly.
