题目

   An Australian company, Smart Car Technologies, has developed a system that lets drivers know when they're speeding. When the technology becomes commercially available, it could help lead-footed drivers avoid tickets and also save lives. The company that developed the product hopes to convince Australian government agencies to put the technology into use in their automobile fleets. The product, called Speed Alert, links real-time location data and speed obtained with the help of GPS to a database of posted speed limits stored in a driver's PDA or programmable mobile phone. The setup of the1、7月17日，国家统计局公布的数据显示，2008年上半年我国居民消费价格总水平（CPI）同比上涨7.9%，城市上涨7.6%，农村上涨8.6%。物价是反映国民经济运行与发展的重要指标，它是国民经济运行与发展的“晴雨表”。作为“晴雨表”的物价，可以反映下列内容：  ①商品的使用价值                                ②商品的价值量 ③市场供给和需求的关系                          ④经济发展的质量和效益 A．①②③          B．②③④         C．①④         D．②③