Scientists have already confirmed the existence of an ocean on Europa, another moon orbiting Jupiter, and NASA has announced plans to send an unmanned mission there searching for the life that might come with liquid water.

　　Hubble is a telescope that orbits Earth, but because of its impressive gravitational analyses it can be used to study the inside of far distant planets. Using these same principles, scientists could theoretically detect oceans on distant planets as well.

　　28. What can we learn about the Ganymede from the passage? A. It is a planet with the largest moon in our whole solar system.  B. Its ocean adds to people’s excitement about life beyond Earth.  C. It will be used by NASA as a base for the Hubble telescope.  D. Its liquid ocean was first proved by the Galileo spacecraft. 

　　29. Which of the following best describes the writer’s attitude towards Hubble? A. Cautious             B. Doubtful                      C. Negative            D. Favourable 30. What does the underlined part in Paragraph 6 mean? A. An underground ocean has been found in Europe.  B. The presence of an underground ocean in Europe is not possible.  C. It is now certain that there is an ocean ion Europe.  D. No evidence has shown the existence of an ocean on Europe. 

　　31. What type of writing does this passage belong to? A. A term essay                       

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