2．What does the underlined words “that question” refer to? ( no more than 15 words)

　　________________________________________________________________________

　　3. What’s the main purpose of the author to write this passage? (no more than 15 words)

　　________________________________________________________________________

　　4. What does the passage mainly talk about? (no more than 15 words)

　　________________________________________________________________________

　　Ⅲ.阅读理解

　　Three Chinese astronauts，Zhai Zhigang，Liu Boming，and Jing Haipeng coming

　　back from a 68-hour flight，which included a 20-minute spacewalk on Saturday，arrived in Beijing to a joyful homecoming parade Monday.

　　Space medical scientists said space radioactivity，zero gravity in space and the virus-free environment in the spaceship might pose potential health damage to astronauts.In addition，they still need time to adjust themselves to the Earth gravity environment.

　　The success of the mission shifts the focus to building the space station and plans to land a man on the moon，said Wang Zhaoyao，deputy director of manned space flight.

　　He said the program is looking to launch a new orbiting vehicle and set up a simple space lab by 2011.There are also hopes of sending unmanned and manned space vehicles to perform docking activities with the target vehicle.

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