B. To show her determination.

　　C. To get money for school fees.

　　D. To go on an adventure by herself.

　　27. What is Alo's advice for Viv?

　　A. To be a positive and kind person.

　　B. To avoid the negative part of life.

　　C. To be cautious of cold-hearted people.

　　D. To explore the beauty of the world.

　　28. How did the author feel when writing the letter?

　　A. Amused and thankful.

　　B. Pleased and satisfied.

　　C. Cheerful and relieved.

　　D. Concerned and anxious.

　　C

　　Life may have evolved on at least three planets within a newly discovered solar system 39 light years from Earth. Astronomers at the NASA have discovered no less than seven roughly Earth-sized worlds orbiting a dwarf star in the system. Scientists had previously identified a tiny number of "exoplanets", which are believed to have the qualities needed to support life. However, the new system contains an unprecedented(前所未有) number of Earth-sized, probably rocky planets, and is being acknowledged as an "accelerated leap forward" in the search for

　　extraterrestrial (外星球的)life.

　　Three of the new planets are said to be particularly promising because there might exist oceans. Thomas Zurbuchen, associate administrator of NASA, told a press conference in Washington: "This gives us a hint that finding a second Earth is not a matter of 'if', but 'when'."

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