The world is full of amazing things.Let\’s see China\’s amazing technology!Nowadays,we are used to using our phone to get a map of our location.But how do our phones know where in the world,we are and in which direction we are going?It is all thanks to the satellites in space that help our phones calculate our position.Depending on where you are around the world,your phone may be receiving data from different systems.That\’s how the Bei Dou Navigation Satellite System（BDS）works in China.
The BDS nowadays is more advanced than the first version（版本）of the system,which was sent into space in 2000.The present version has better technology and more satellites.The system is not finished,there will be lots of BDS satellites.In the future,those satellites will allow us to discover the position of objects with millimetre accuracy（精确度）.
Even though more satellites are being added to the system,the BDS has already been put to use.More than 40,000 Chinese fishing boats are using the system now.These boats are easily to be searched at sea.They are able to communicate with people on land as well as give the exact locations of ships in trouble.
The BDS is being used on land as well.Of course,it\’s not hard to imagine how the system is helping the police do their job.So does farming.Farmers are able to put the data to good use when operating smart farming machines.For example,the BDS can be used to control driverless trucks as they turn up the fields.Farmers are also using drones（无人机）.
Although the BDS is a product of China,the developers are actively developing international cooperation（合作）.Developers predict that the system will be not only popular within China,the BDS will undoubtedly bring lots of advantages to China and the rest of the world.

（1）The underlined word "calculate" here probably means ______.

calculate /\’kælkjuleɪt/verb ①to solve the meaning of something ②to form an opinion about something ③to specially design a product or an event ④to work out the results according to the data or clues

A．①
B．②
C．③
D．④
（2）How does the writer show the changes in the BDS in Paragraph 2? ______
A．By giving examples.
B．By telling stories.
C．By listing numbers.
D．By comparing conditions.
（3）Which of the following can we learn from the passage? ______
A．The BDS has already become popular both at home and abroad.
B．People around the world use the same system to locate positions.
C．The whole world will take advantages of the BDS in several years.
D．The BDS has become a common way of communication in daily life.
（4）In which part of a magazine can we read the passage? ______
A．Science.
B．Art.
C．People.
D．Sports.