Barry Brown says this goes against a common belief that GPS systems are for passive drivers who lack navigational (导航) skills.

　　“The Normal, Natural Troubles of Driving with GPS” lists several areas where GPS systems can cause confusion for drivers. These include maps that are outdated, incorrect or difficult to understand. They also include timing issues related to when GPS commands are given.

　　Barry Brown says to make GPS systems better we need a better understanding of how drivers, passengers and GPS systems work together.

　　文章大意：本文是一篇说明文。GPS全球定位系统可以帮助人们找到想去的地方，但GPS也会带来许多问题，所以使用GPS全球定位系统是否可靠变得不确定。

　　4．What is the best title for this passage?

　　A．Is GPS system reliable to use?

　　B．What is the use of GPS?

　　C．How to make the most of GPS?

　　D．Blame! GPS or Passengers?

　　答案：A　标题概括题。文章第一段是全文的主旨段。根据第一段可知，GPS全球定位系统可以帮助人们找到想去的地方，但GPS也会导致许多问题，所以使用GPS全球定位系统是否可靠变得不确定。所以A项最适合做文章的标题，故答案选A。

　　5．What is the implication of the underlined part?

　　A．GPS is just a garbage device.

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