题目内容
下面是一篇杂志文章,请将标有A-F的段落插入文章中标号1-5的合适位置,使这篇文章意义完整,结构连贯;其中有一个段落是多余的。?For three groups of explorers formed by college students and young white collars,it started out as a wonderful trip.[1] _________
The drama unfolded during the May Day holiday.One girl did not make it before the students were rescued.[2] _________
GPS,or Global Positioning System,is a satellite?based navigation system made up of a network of 24 satellites.It was originally created for military use by the US in 1980s but is now available for civilian use.[3] _________
[4] _________A GPS receiver must be locked on to the signals of at least three ?satellites to calculate the latitude and longitude of its location.Once the user's position has been determined,the GPS receiver can calculate other information,such as speed, direction,distance to destination,and a whole lot more.
A.GPS will be fitted on all the cars.
B.They were enjoying themselves exploring the Inner Mongolian desert.But when the sandstorm came,the trip became a disaster.
C.GPS works in any weather conditions,anywhere in the world,24 hours a day.And the service is free.
D.With four or more satellites in view,the receiver can determine the user's altitude.?
E.GPS are only produced in China.
F.GPS satellites circle the earth twice a day and transmit signals and information to the earth.GPS receivers take this information and calculate the user's exact location.?
G.The group was eventually found with the help of a GPS receiver.