They work five days on and two days off to mimic the normal way they do things on Earth as much as possible. Weekends give the crew valuable time to rest and do a few hours of housework. They can communicate with family and friends by email, internet phone and through private video conferences.

　 While astronauts cannot go to a baseball game or a movie in orbit, there are many familiar activities that they can still enjoy. Before a mission, the family and friends of each ISS crewmember put together a collection of family photos, messages, videos and reading material for the astronauts to look at when they will be floating 370 kilometers above the Earth. During their mission, the crew also receives care packages with CDs, books, magazines, photos and letters. And as from early 2010, the internet became available on the ISS , giving astronauts the chance to do some "web surfing（冲浪）"in their personal time. Besides relaxing with these more common entertainments, astronauts can simply enjoy the experience of living in space.

Many astronauts say that one of the most relaxing things to do in space is to look out of the window and stare at the universe and the Earth's vast land mass and oceans.

　12. What does the word "mimic" in Paragraph 1 probably mean?

　　A. find B. lose C. change D. copy

　13. Which of the following best describes the families of the astronauts on the ISS ?

　　A. They are caring and thoughtful. B. They are worried and upset.

　　C. They are impatient and annoyed. D. They are excited and curious.

　14. In the final paragraph, the author shows that astronauts_______.

　　A. get more pleasure in space than on the Earth.

B. love to see the Earth from space.

　　C. regard space life as common.

D. find living in space a bit boring and tiring.

　15. The passage mainly discusses how astronauts_______.

　　A. work for longer missions in space. B. connect with people on the Earth.

C. spend their free time in space. D. observe the Earth from space.