Marshall Porterfield is the director of NASA’s Space Life and Physical Sciences Division. He says the Skylab astronauts’ understanding of their own ability to deal with long-term spaceflight continues to help current astronauts. NASA says the next step for life away from Earth is a year-long space station mission, set for 2015.

　　29. Why was Chris Hadfield’s song so special?

　　A. It was performed in space.

　　B. It was created by an astronaut.

　　C. It was a very familiar song.

　　D. It was first sung by a famous singer.

　　30. Which of the following best describes the physical condition of Chris Hadfield after his return?

　　A. Worse.

　　B. Better.

　　C. Normal.

　　D. Weaker.

　　31. For what purpose did NASA launch Skylab?

　　A. To research on whether human beings could stay in space.

　　B. To gather up information on setting up a space station.

　　C. To study the changes in the body when staying long in space.

　　D. To find out the possibility of doing experiments in space.

　　32. What can we learn from the last paragraph?

　　A. Skylab is still in use to explore the space.

　　B. The research results on Skylab are still valuable.

　　C. Skylab is more advanced than the International Space Station.

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