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

　　1．According to Barry Brow，in most cases，________are blame for the problems.

　　A．human errors

　　B．GPS errors

　　C．errors caused by both drivers and GPS

　　D．errors caused by putting in a wrong address

　　2．The example of Barry Brown’s friend is used to show that________.

　　A．GPS is nothing but garbage

　　B．GPS is still not accurate enough

　　C．it is difficult for drivers to use GPS equipment

　　D．sometimes drivers are responsible for the problem

　　3．It can be inferred from the second paragraph that________.

　　A．it’s impossible to drive from the east to the west in the US

　　B．Barry Brown’s friend went to Stockholm，Sweden by plane

　　C．given wrong instructions，the GPS will produce wrong results

　　D．GPS systems are for passive drivers who lack navigational skills

　　4．Which of the followings is one of the shortcomings of GPS equipment?

　　A．It just tells the driver to turn once at a time.

　　B．It gives the driver the overview.

　　C．Its screen is too small to be seen clearly.

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