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30.What is the author's purpose by counting down?.A.To describe how naughty her granddaughter was..0,81…B.To show how much she wanted to know what the gift was.C.To describe how impatient she was with her granddaughter.02D.To show her granddaughter told the secret as quickly as she expected.31.When she received the gift,the author3:A.found that her granddaughter had drawn it very wellB.was disappointed about learning about the gift too earlyC.was annoyed at her granddaughter for letting out the secret4·nrD.found her granddaughter was sorry for telling her the secretDi11…When you want to go'somewhere,you can.easily find your way by using a map app onyour smartphone.Your smartphone"knows"where you are and can tell you where to go.This is possible with the help of satellite navigation(卫星导航)systems.On June23,withthe last satellite of China's Beidou Navigation Satellite System launched into space,the globalnetwork of 59 satellites has been completed.On July 31,Beidou started providing full-scaleglobal services.More than 120 countries and regions are now using Beidou services.The BDSis entirely built by Chinese engineers,which is one of four global navigation systems,alongwith US'GPS,Russia's GLONASS and the European Union's Galileo.lt's difficult to imagine the great impact those satellites,.orbiting(围绕.运转)the Earth,have on our daily lives.When you unlock one of Hellobike's bicycles,you are using the BDS.The popular bike-sharing company came out with two new bike models this year that areequipped with the positioning (service."The intelligent lock on each bike receivesBeidou satellite signals and sends positioning information to the data center,which will helpcollect big data on the bikes and estimate users'riding.demands in advance according to thedata,"Chu Yiqun,a manager of Hellobike told Xinhua News Agency.Users can also findshared bikes more accurately thanks to Beidou's global positioning accuracy (of 2.34meters.Beidou adopts a unique two-way communication system,including its ability to receivemessages sent by people from areas with poor communication signals.It allows people to sendtext messages up to 1,200 Chinese characters in length when mobile phone services areinterrupted(中断)by natural disasters..y·e-点：fsr7.gr!f~高一英语第7页（共12页)