完形填空satellite navigation system

　　China is to contribute to a new global satellite navigation system being developed by European nations. The Galileo satellite system __1__ a more accurate civilian alternative to the Global Positioning System (GPS)， operated by the US military， China will provide 230m Euros(USD 259 m)in __2__ and will cooperate with technical， manufacturing and market development. “China will help Galieo to __3__ the major world infrastructure for the growing market for location services，” said Loyola de Palacio， EU transport commissioner. A new center that will coordinate co-operation was also announced __4__ the European Commission， the European Space Agency (ESA) and the Chinese Ministry of Science and Technology not long __5__。 The China-Europe Global Navigation Satellite System Technical Training and Cooperation Center will be __6__ at Beijing University. China has a substantial satellite launch industry and could potentially help launch the Galieo satellites.

　　The US has claimed that Galileo could interfere __7__ the US ability to downgrade the GPS service during military conflicts. European officials say this is unfounded and counter that US opposition __8__ the commercial challenge Galileo would present to GPS. Galileo will be precise to within meter， while the civilian GPS service is accurate to around 10 meters.

　　The Galileo satellite constellation will __9__ 27 operational and three reserve satellites orbiting the Earth at an altitude of 23，600 km. the satellites will be strung along three medium-Earth orbits at 56 degrees inclination to the equator and will provide global coverage. The system should be operational by 2008 and the entire project is expected to __10__ around 3.2 billion Euros (USD 3.6 billion) 。

　　the European Commission has said Galileo will primarily be used for transportation technology， scientific research， land management and disaster monitoring.

　　Galileo will provide two signals： a standard civilian one and an encrypted， wide-band signal __11__ the Public Regulated Service (PRS)。 This second signal is designed to withstand localized jamming and will be used by police and military services in Europe. European Commission __12__ have said China will not be given access to the PRS.

　　The first Galileo satellite is scheduled to launch late in 2004. Clocks on board __13__ will be synchronized through 20 ground sensors stations， two command centers and 15 uplink stations.

　　Receivers on the ground will use time signals from the satellites to precisely calculate their __14__。 A “search and rescue” function will also __15__ distress signals be relayed through the constellation of satellites.

　　1. A. offer B. offered C. will offer D. has offered

　　2. A. funding B. providing C. paying D. charging

　　3. A. build B. use C. become D. do

　　4. A. in B. at C. on D. by

　　5. A. before B. ago C. after D. later

　　6. A. found B. produced C. positioned D. located

　　7. A. with B. for C. about D. above

　　8. A. results in B. gives rise to

　　C. is due to D. causes

　　9. A. be made from B. consist of C. consist in D. be consisted of

　　10. A. spend B. gain C. give D. cost

　　11. A. offered B. called C. used D. turned

　　12. A. officials B. countries C. organization D. agreement

　　13. A. satellite B. the satellite C. the satellites D. satellites

　　14. A. speed B. direction C. distance D. location

　　15. A. send B. let C. allow D. transmit