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.

　　Two more Shenzhou spaceships will dock with Tiangong­I next year, and one will be manned by two or three astronauts, according to China Manned Space Engineering Office, which was the main user of the Tianlian I series data relay satellites.

　　“The new satellite can cover a greater area to track and command the country's space vehicles in low­Earth orbits, such as manned spacecraft and remote sensing satellites, from a higher position in outer space. Only three satellites of this kind are needed to form a global communication network, and China has two now.” Pang Zhihao, a researcher and deputy editor­in­chief of Space International, said.

　　The satellite could also equip astronauts with real­time communications, which will benefit the county's future manned space flights, he said.

　　21．What is the main purpose to send up Tianlian I ­02 ?

　　A.To test the function of a Long­March­3C carrier rocket.

　　B.To carry some astronauts into space to do some research.

　　C.To send more information and clearer pictures to mobile phones on the earth.

　　D.To promote the country's satellite communication network for space docking.

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