Scientists have found over 2,300 new planets since Kepler was launched.

　　About 200 of these are about the size of the Earth. Most are much larger, but it is the new planet's distance from its star that is important. For life to possibly exist there, the planet's temperature must not be too hot or too cold.

　　63. What can we learn about Kepler-22b?

　　A. Water must have been existed on it.

　　B. It takes humans about 600 years to get there.

　　C. It is made of gases, rocks and many kinds of liquids.

　　D. It is the first planet in outer space where life may survive.

　　64. The Kepler spacecraft was sent into space to ______.

　　A. show honor to Johannes Kepler

　　B. look for Earth-like planets in the sky

　　C. observe the changes of a star's brightness

　　D. measure the brightest star among 150,000 stars

　　65. In Paragraph 5 the author mainly tells us______.

　　A. how the Kepler system works

　　B. if the Kepler system sees a new planet

　　C. how the Kepler system uses the space telescopes

　　D. why an important part of the Kepler system remains on the Earth

　　66. What can we infer from the passage?

　　A. Life may exist on the new planet in another form.

　　B. It is colder on the new planet because its sun is smaller.

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