There are now three planets outside the system, known as exoplanets, which experts believe could potentially be colonised (建殖民地) by future generations.

　　In May, French astronomers identified Gliese 581d, which is far closer at around 20 light years away. It is about six times the mass (质量) of Earth and is one of a family of at least six planets.

　　In August, a team from Switzerland reported that another planet called HD 85512b and 36 light years away seemed to be habitable.

　　The planet is in the constellation of Vela, measuring around 3.6 times the Earth’s mass.

　　According to an online catalogue that indexes bodies outside our solar system, a total of 47 exoplanets and exomoons are potential habitable candidates but not enough research has been done to be sure.

　　32. Whether a planet is suitable for mankind to live on doesn’t depend on ________.

　　A. whether there are proper temperatures              B. whether it is close enough to Earth

　　C. whether there is atmosphere around it             

　　D. whether there is land and water on it

　　33. In what way is Kepler 22b like Earth?

　　A. Its mass.                  

　　B. Its size.            

　　C. Its conditions.          

　　D. Its shape.

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