阅读下面的短文,文中有15处空白,每处空白给出了4个选项,请根据短文的内容从4个选项中选择1个最佳答案。 ) d/ F) M% v/ T2 h
China to help Europe develop GPS rival 7 l( l5 h- V& R9 s* [
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.
0 Y" |/ [, A* }: o, F$ c. A 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. ' e c/ `, ?) L, |7 D9 A
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) . + V; X/ J% k/ O, g# F2 H
The European Commission has said Galileo will primarily be used for transportation technology, scientific research, land management and disaster monitoring. " x0 `3 U5 m: D# _7 E
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. : J* ^" N# W" m5 K
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.
# |# r# { }3 R: C 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.
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& K: ?- e, y+ |) A 14. A. speed B. direction C. distance D. location
# z1 N% u" y& n8 v8 Z 15. A. send B. let C. allow D. transmit
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