6．Many years ago，people depended on the sun，the moon and stars to find their way around.And now，we have satellite to guide us.These systems use groups of satellites to show the users the right place they want to go.They send information to a receiver，such as a smartphone，to show us where we are.
The earliest built satnav system （衛(wèi)星導(dǎo)航系統(tǒng)） is the Global Positioning System（ GPS）.Then there is Russia's Global Navigation Satellite System，the European Union's Galileo and China's own satellite navigation system -- BeiDou.
On October 14，2017，an ARJ2 1-700 which had the BeiDou navigation system，successfully completed a test flight.The results show
the system developed by China was as good as the systems produced by other countries.
Since its introduction in 2000，the BeiDou navigation system has helped people in everyday life，from shared bikes to farming.For example，farmers can use BeiDou to help themselves do the farm work in the field.
With its many uses，the BeiDou navigation system has even become more and more important in the Belt and Road Initiative （一帶一路）.So far，the BeiDou system has covered most parts of the Asia-Pacific area.
Today，there are more than 20 BeiDou satellites above our heads，and China plans to send up even more this year so that the BeiDou network can be more satisfying for the Belt and Road Initiative.BeiDou will be more popular in the logistics industry.
（1）The first two paragraphs mainly tell us about
.
A．how to make navigation systems
B．the advantages of navigation systems
C．how to use navigation systems
D．some navigation systems and how they work
（2）The underlined phrase "the system" means
.
A．the European Union's Galileo
B．the BeiDou navigation system
C．the Global Positioning System
D．Russia's Global Navigation Satellite System
（3）According to the passage，we've already used the BeiDou navigation system
.
A．to send up more satellites
B．in every part of Asia-Pacific area
C．to help farmers with farming
D．in the worldwide logistics industry
（4）The writer thinks the future of the BeiDou system is
.
A．worrying
B．uncertain
C．hopeful
D．surprising
（5）Where can you most probably read this passage？
A．Travel magazine.
B．Newspaper.
C．Fashion magazine.
D．Technology Daily.
