17．C　细节理解题。由前两段可以直接得出答案。

　　18．D　细节理解题。由第三段可知。

　　Beijing；(13, July)China sent up a new data relay satellite, Tianlian I­02, on Monday at the Xichang Satellite Launch Centre in South­western Sichuan province. The new satellite will promote the country's satellite communication network for space docking (对接).

　　The satellite was launched on a Long­March­3C carrier rocket at 11：41 p．m., sources at the centre told Xinhua News Agency. The satellite separated from the rocket 26 minutes after its launch and was then successfully delivered into a geostationary transfer orbit (地球同步转移轨道)．

　　Developed by the China Academy of Space Technology under the China Aerospace Science and Technology Corporation, the satellite is the country's second data relay satellite. The first, Tianlian I ­01, was launched on April 25,2008.

　　The two satellites will form a network to improve communications between China's spacecraft and bases on Earth, according to the centre. They will also be used to help the nation's first space docking, scheduled for the second half of this year.

　　As planned, China will launch space module Tiangong­I , which was designed as a platform that will dock with an unmanned spaceship, Shenzhou, for the county's first space­docking mission this year.

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