Do you always get lost? Don’t worry. When you want to go somewhere, it is _________ for you to find your way by using a map app on your smart phone than before. Your smart phone “knows” where you are and _________ tell you where to go.
This is _________ with the help of satnav(卫星导航) systems. A satnav system uses groups of satellites(卫星) to find out _________ people are. It sends information to a receiver, such _________ a smart phone.
On June 23, 2020, the Beidou Navigation Satellite System was sent up into space. Beidou, China’s own navigation system _________ finally. It is one of the four global navigation systems, along with US’ GPS, Russia’s GLONASS and the European Union’s Galileo.
On July 31, Beidou started providing full-scale(全方位) global services. Now, more than 120 countries and regions _________ Beidou services. Since 2000, China has launched(发射) 59 Beidou satellites. Beidou can be used in areas _________ include farming, public services and business. It can position exactly within 10 meters. In the summer of 2020, people along _________ Yangtze River used Beidou-based device to monitor (监控) flood waters well.
Beidou also has a special messaging ability. It allows people to send text messages up to 1,200 Chinese characters in length __________ mobile phone services are broken by natural disasters. Therefore, it really helps us a lot.
1. A.easy | B.easier | C.easiest | D.the easiest |
2. A.can | B.need | C.must | D.mustn’t |
3. A.impossible | B.possibly | C.possibility | D.possible |
4. 5. 6. A.complete | B.completed | C.was completed | D.is completed |
7. A.have used | B.will use | C.used | D.are using |
8. 9. 10. A.unless | B.when | C.before | D.until |